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Civil Engineering : Hydraulics - Quiz(MCQ)
1 .
Manning's formula is used for_______.
A)
flow in pipes
B)
flow in open channels
C)
head loss due to friction in open channels
D)
head loss due to friction in pipes flowing full

Correct Answer :   head loss due to friction in open channels

2 .
A non-uniform steady flow is through
A)
a long pipe at increasing rate
B)
an expanding tube at constant rate
C)
a long tube at a decreasing rate
D)
an expanding tube at increasing rate

Correct Answer :   an expanding tube at constant rate

3 .
Pick up the correct statement regarding Borda's mouth piece running full from the following :
A)
Coefficient of velocity is 1/√2
B)
Actual velocity at the out let is √gH
C)
Theoretical velocity at the outlet is √2gH
D)
All of the above

Correct Answer :   * Coefficient of contraction is 1
* Coefficient of velocity is 1/√2
* Actual velocity at the out let is √gH
* Theoretical velocity at the outlet is √2gH

4 .
An open container filled with water is moved vertically downward with a uniform linear acceleration. The pressure at its bottom will be
A)
lesser than static pressure
B)
equal to static pressure
C)
greater than static pressure
D)
None of the above

Correct Answer :   lesser than static pressure

5 .
Differential manometers are used to measure
A)
very low pressure
B)
difference in pressure at two points
C)
atmospheric pressure
D)
pressure in water channels, pipes, etc.

Correct Answer :   difference in pressure at two points

6 .
For uniform flow in canals______.
A)
bed of channel represents the hydraulic gradient
B)
bed and free water surfaces of a channel are parallel to each other
C)
there is a balance between the frictional loss and drop in elevation of the channel
D)
All of the above

Correct Answer :   All of the above

7 .
If H is height of the liquid above the sill, the effect of end contractions, according to Francis formula, is________.
A)
0.1 H
B)
0.2 H
C)
0.3 H
D)
0.4 H

Correct Answer :   0.1 H

8 .
The ratio of the percentagge error in the discharge and percentage error in the measurement of head over a triangular notch, is____.
A)
2/3
B)
2/5
C)
5/2
D)
6/8

Correct Answer :   5/2

9 .
Equation of continuity of flow is based on the principle of conservation of
A)
mass
B)
force
C)
momentum
D)
None of the above

Correct Answer :   mass

10 .
The flow in open channel is said to be subcritical if the Froude number is_____.
A)
equal to 1.0
B)
less than 1.0
C)
greater than 1.0
D)
None of the above

Correct Answer :   less than 1.0

11 .
In flowing liquids pitot tubes are used measure___.
A)
depth
B)
pressure
C)
velocity
D)
discharge

Correct Answer :   velocity

12 .
According to the principle of buoyancy a body totally or partially immersed in a fluid will be lifted up by a force equal to_____.
A)
the weight of the body
B)
more than the weight of the body
C)
less than the weight of the body
D)
weight of the fluid displaced by the body

Correct Answer :   weight of the fluid displaced by the body

13 .
An ideal fluid is_______.
A)
compressible
B)
incompressible
C)
compressible and non-viscous
D)
slightly affected by surface torque

Correct Answer :   compressible and non-viscous

14 .
For maximum horse power of a nozzle, the head supplied must be equal to____.
A)
head loss in the pipe due to friction
B)
twice the head loss in the pipe due to friction
C)
thrice the head loss in the pipe due to friction
D)
four times the head loss in the pipe due to friction.

Correct Answer :   thrice the head loss in the pipe due to friction

15 .
A tank 4m x 3m x 2m containing an oil of specific gravity 0.83 is moved with an acceleration g/2 m sec². The ratio of the pressures at its bottom when it is moving vertically up and down, is
A)
2
B)
3
C)
1/2
D)
1/3

Correct Answer :   3

16 .
Highest dam in India, is_____.
A)
Bhakra dam
B)
Iddiki dam
C)
Hirakund dam
D)
Nagarjuna Sagar dam

Correct Answer :   Bhakra dam

17 .
The horizontal component of the force on a curved surface is equal to________.
A)
weight of liquid retained by the curved area
B)
force on a vetical projection of the curved surface
C)
product of pressure at its centroid and the area
D)
weight of liquid vertically below the curved surface

Correct Answer :   force on a vetical projection of the curved surface

18 .
The radius of gyration of the water line of a floating ship is 4 m and its metacentric height is 72.5 cm. The period of oscillation of the ship, is____.
A)
2Ï€
B)
3Ï€
C)
4Ï€
D)
Ï€/2

Correct Answer :   3Ï€

19 .
When a body is totally or partially immersed in a fluid, it is buoyed up by a force equal to_______.
A)
weight of the fluid displaced by the body
B)
weight of the body
C)
weight of the body and fluild displaced by the body
D)
difference of weights of the fluid displaced and that of the body

Correct Answer :   weight of the fluid displaced by the body

20 .
If the total head of the nozzle of a pipe is 37.5 m and discharge is 1 cumec, the power generated is_______.
A)
400 H.P
B)
450 H.P
C)
500 H.P
D)
550 H.P

Correct Answer :   500 H.P

21 .
Pick up the correct statement from the following :
A)
For maximum discharge the depth of flow must be 0.95 times the diameter of circular channel
B)
For maximum velocity, the hydraulic mean depth must be 0.3 times the diameter of circular channel
C)
For maximum velocity of flow, the depth of water in the circular channel must be 0.81 times the diameter of the channel
D)
All of the above

Correct Answer :   All of the above

22 .
The dimensions MLT⁻² refers to________.
A)
force
B)
discharge
C)
specific weight
D)
none of the above

Correct Answer :   force

23 .
The line joining the points to which the liquid rises in vertical piezometer tubes fitted at different cross-sections of a conduit, is known as_____.
A)
piezometric line
B)
hydraulic gradient
C)
pressure grade line
D)
All of the above

Correct Answer :   All of the above

Explanation : * piezometric line
* hydraulic gradient
* pressure grade line
* hydraulic grade line

24 .
The ratio of the inertia and gravitational force acting in any flow, ignoring other forces, is called________.
A)
Weber number
B)
Frode number
C)
Euler number
D)
Reynold number

Correct Answer :   Frode number

25 .
In C.G.S. system the unit of visocity is_______.
A)
poise
B)
dyne
C)
joule
D)
Newton

Correct Answer :   poise

26 .
The ratio of the percentage error in the discharge and percentage error in the measurement of head, over rectangular notch, is_____.
A)
1/2
B)
2/3
C)
3/2
D)
3/4

Correct Answer :   3/2

27 .
The notch angle for maximum discharge over a triangular notch, is______.
A)
30°
B)
60°
C)
90°
D)
120°

Correct Answer :   90°

28 .
Capillary rise of water is________.
A)
inversely proportional to water density
B)
directly proportional to surface tension
C)
inversely proportional to diameter of the tube
D)
All of the above

Correct Answer :   All of the above

29 .
A water tank partially filled with water is being carried on a truck moving with a constant horizontal acceleration. The level of the water
A)
falls on the back side of the tank
B)
rises on the back side and falls on the front side
C)
rises on the front side of the tank
D)
remains the same at both sides of the tank

Correct Answer :   rises on the back side and falls on the front side

30 .
The dimensional formula of force is______.
A)
MLT⁻²
B)
ML⁻²T
C)
M⁻¹LT²
D)
M⁻¹L²T⁻²

Correct Answer :   MLT⁻²

31 .
The line of action of the buoyant force acts through the________.
A)
centriod of the displaced volume of fluid
B)
center of the volume of floating body
C)
center of gravity of any submerged body
D)
centroid of the volume of fluid vertically above the body

Correct Answer :   centriod of the displaced volume of fluid

32 .
An object having 10 kg mass weighs 9.81kg on a spring balance. The value of 'g' at this place is_____.
A)
9.75 m/sec²
B)
9.81 m/sec²
C)
10 m/sec²
D)
10.2 m/sec²

Correct Answer :   10 m/sec²

33 .
The region between the separation streamline and the boundary surface of the solid body is known as_____.
A)
drag
B)
wake
C)
lift
D)
boundary layer

Correct Answer :   wake

34 .
The shear stress distribution for a fluid flowing in between the parallel plates, both at rest, is________.
A)
constant over the cross section
B)
parabolic distribution across the section
C)
zero at plates and increases linearly to midpoint
D)
zero at the mid plane and varies linearly with distance from mid plane

Correct Answer :   zero at the mid plane and varies linearly with distance from mid plane

35 .
The ratio of frictional factor and coefficient of friction used in general equation for a head loss in a pipe, is_____.
A)
1
B)
2
C)
3
D)
4

Correct Answer :   4

36 .
Flow in pipes is turbulent if Reynold number is______.
A)
less than 2100
B)
more than 3000
C)
between 2100 and 3000
D)
None of the above

Correct Answer :   more than 3000

37 .
The phenomenon occuring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream causing a distinct rise of liquid surface, is____.
A)
water hammer
B)
critical discharge
C)
hydraulic jump
D)
None of the above

Correct Answer :   hydraulic jump

38 .
Practical fluids possess_____.
A)
viscosity
B)
surface tension
C)
compressibility
D)
All of the above

Correct Answer :   All of the above

39 .
The depth of the centre of pressure on a vertical rectangular gate (4 m wide, 3 m high) with water upto top surface, is______.
A)
2.0 m
B)
1.5 m
C)
1.0 m
D)
None of the above

Correct Answer :   2.0 m

40 .
The differential equation dp/ρ + gdz + vdv = 0 for a fluid motion is suggested by
A)
Leonard Euler
B)
Laplace
C)
Bernoulli
D)
Cauchy-Riemann

Correct Answer :   Leonard Euler

41 .
A nozzle is fitted at the end of a pipe whose length is 320 m and diameter is 10 cm. If the value of f = 0.01, the diameter of the nozzle for the maximum transmission of power through the nozzle is________.
A)
2.4 cm
B)
2.5 cm
C)
2.6 cm
D)
2.7 cm

Correct Answer :   2.5 cm

42 .
A rectangular channel 6 m wide and 3 m deep and having a bed slope as 1 in 2000 is running full. If Chezy's constant C = 54.8, pick up the correct specification of the channel from the following :
A)
Rate of flow = 27 m³/sec
B)
Velocity of flow = 1.5 m/sec
C)
hydraulic mean depth = 1.5 m
D)
All of the above

Correct Answer :   All of the above

43 .
Non-over flow double curvature concrete arch, is provided in______.
A)
Idukki dam
B)
Bhakra dam
C)
Hirakund dam
D)
Nagarjuna Sagar dam

Correct Answer :   Idukki dam

44 .
Hydraulic ram is a device_____.
A)
for lifting heavy loads
B)
for accelerating water flow
C)
for lifting water without an electric motor
D)
None of the above

Correct Answer :   for lifting water without an electric motor

45 .
Gauge pressure is_______.
A)
absolute pressure + atmospheric pressure
B)
absolute pressure - atmospheric pressure
C)
atmospheric pressure - absolute pressure
D)
None of the above

Correct Answer :   absolute pressure - atmospheric pressure

46 .
In an inclined pipe, the pressure difference at its two ends is due to________.
A)
elevation head
B)
frictional loss head
C)
sudden head drop at inlet
D)
All of the above

Correct Answer :   All of the above

Explanation : * elevation head
* frictional loss head
* exit head drop
* sudden head drop at inlet

47 .
Weber number is the ratio of inertia force to
A)
viscosity
B)
elasticity
C)
gravitational force
D)
surface tension

Correct Answer :   surface tension

48 .
The width of a weir with end contraction, is______.
A)
less than the width of the channel
B)
half the width of the channel
C)
equal to the width of the channel
D)
None of the above

Correct Answer :   less than the width of the channel

49 .
An error of 1% in measuring the head of water over the crest of a rectangular weir, produces an error in the discharge which is equal to____.
A)
1.25%
B)
1.5%
C)
1.75%
D)
2.25%

Correct Answer :   1.5%

50 .
Orifice-meter is used to measure_________.
A)
discharge
B)
velocity
C)
average speed
D)
pressure at the point

Correct Answer :   discharge

51 .
Back water curve is caused if
A)
there is an increase in width of the channel
B)
friction head loss is more than the bed slope
C)
pressure is due to weir in the channel
D)
All of the above

Correct Answer :   pressure is due to weir in the channel

52 .
Power transmitted through a pipe is maximum when friction head loss, is
A)
one-half of the total head supplied
B)
one-third of the total head supplied
C)
one-fouth of the total head supplied
D)
equal to the total head supplied

Correct Answer :   one-third of the total head supplied

53 .
A pipe of 0.1 m² cross sectional area suddenly enlarges to 0.3 m² cross-sectional area. If the discharge of the pipe is 0.3 m³ /sec, the head loss is
A)
2/g m of water
B)
g/2 m of water
C)
1g m of water
D)
√g m of water.

Correct Answer :   2/g m of water

54 .
When the whole fluid mass rotates either due to fluid pressure or gravity or rotation previously imparted, the motion is known as________.
A)
free vortex
B)
forced vortex
C)
rotational vortex
D)
non-potential vortex

Correct Answer :   free vortex

55 .
The ratio of the maximum height to which a jet inclined through θ rises to its total horizontal span is
A)
1/4 sin θ
B)
1/4 cos θ
C)
1/4 tan θ
D)
1/4 cot θ

Correct Answer :   1/4 tan θ

56 .
If S is the length of the crest, H is the height of water source of a weir whose length is L and discharge is Q m3/sec, the velocity of approach Vd is
A)
√2gH
B)
Q / L(H-L)
C)
Q / L(H+S)
D)
L(H+S) / Q

Correct Answer :   Q / L(H+S)

57 .
If jet of water coming out from a nozzle with a velocity 9.81 m/s, the angle of elevation being 30°, the time to reach the highest point is____.
A)
1.0 s
B)
1.5 s
C)
0.25 s
D)
0.50 s

Correct Answer :   0.50 s

58 .
The discharge through a 100 mm diameter external mouth piece fitted to the side of a large vessel is 0.05948 m³/s. The head over the mouth piece is____.
A)
2 m
B)
2.5 m
C)
3.0 m
D)
4.0 m

Correct Answer :   4.0 m

59 .
If cohesion between the molecules of a fluid is more than adhesion between the fluid and glass, the free level of fluid in a dipped glass tube will be________.
A)
same as the surface of liquid
B)
lower than the surface of liquid
C)
higher than the surface of liquid
D)
None of the above

Correct Answer :   lower than the surface of liquid

60 .
An open container filled with water is moved vertically upward with a uniform linear acceleration. The pressure at its bottom will be__________.
A)
greater than static pressure
B)
equal to static pressure
C)
lesser than static pressure
D)
None of the above

Correct Answer :   greater than static pressure

61 .
The gases are considered incompressible if Match number is______.
A)
equal to 1.0
B)
is more than 0.5
C)
less than 0.2
D)
equal to 1.5

Correct Answer :   less than 0.2

62 .
The flow in which each liquid particle has a definite path and the paths of adjacent particles do not cross each other, is called_____.
A)
steady flow
B)
uniform flow
C)
stream line flow
D)
turbulent flow

Correct Answer :   stream line flow

63 .
The dimensionless parameter not applicable to flowing liquids, is_____.
A)
Weber number
B)
Reynold number
C)
Pressure coefficient
D)
Kinematic viscosity

Correct Answer :   Kinematic viscosity

64 .
The pressure rise due to water hammer depends upon_____.
A)
the length of pipe
B)
time taken to close the valve
C)
the elasticity of the pipe material
D)
All of the above

Correct Answer :   All of the above

Explanation : * the length of pipe
* time taken to close the valve
* the elasticity of the pipe material
* the velocity of flow of water in the pipe

65 .
In a two dimensional flow if the components of the velocity are u = ax ; v = by, the point where no motion occurs, is known as____.
A)
neutral point
B)
stagnation point
C)
critical point
D)
stationary point

Correct Answer :   stagnation point

66 .
The ratio of inertia force of a flowing fluid and the viscous force of the liquid is called :
A)
Renold's number
B)
Euler's number
C)
Weber's number
D)
Froude's number

Correct Answer :   Renold's number

67 .
Water belongs to_______.
A)
compressible fluid
B)
Newtonian fluids
C)
non-Newtonian fluids
D)
None of the above

Correct Answer :   Newtonian fluids

68 .
Hydraulic radius is equal to_____.
A)
square root of the area
B)
wetted perimeter divided by area
C)
area divided by wetted perimeter
D)
area divided by the square of wetted perimeter

Correct Answer :   area divided by wetted perimeter

69 .
The discharg formula Q = Cd √2gH x A is used for rectangular
A)
small orifices only
B)
for all types of orifices
C)
large orifices only
D)
small and large orifices only

Correct Answer :   large orifices only

70 .
The acceleration f required to accelerate a rectangular tank containing water horizontally so that the slope of its free surface is 45°, is____.
A)
g
B)
g/2
C)
2 g
D)
2.5 g

Correct Answer :   g

71 .
Thee horizontal component of buoyant force is
A)
zero
B)
negligible
C)
same as buoyant force
D)
None of the above

Correct Answer :   zero

72 .
Normal depth in open channel flow is the depth of flow corresponding to
A)
steady flow
B)
laminar flow
C)
uniform flow
D)
unsteady flow

Correct Answer :   uniform flow

73 .
Metacentric height is given as the distance between
A)
center of buoyancy and metacentre
B)
the center of gravity of the body andthe meta center
C)
the center of gravity of the body and the center of buoyancy
D)
the center of gravity of the body and the center of pressure

Correct Answer :   the center of gravity of the body andthe meta center

74 .
The theoretical value of coefficient of contraction of a sharp edged orifice is_____.
A)
1.00
B)
0.98
C)
0.85
D)
0.611

Correct Answer :   0.611

75 .
Most economical section of a triangular channel, is_____.
A)
equilateral triangle
B)
right angled triangle with equal sides
C)
right angled triangle
D)
isosceles triangle with 45° vertex angle

Correct Answer :   right angled triangle with equal sides.

76 .
In an open tube, free surface of mercury remains_____.
A)
horizontal
B)
curved upwards
C)
curved downwards
D)
None of the above

Correct Answer :   curved downwards

77 .
The value of momentum correction factor (β) for a laminar flow through a circular pipe, is
A)
1/2
B)
2/3
C)
3/4
D)
4/3

Correct Answer :   4/3

78 .
A fluid particle may possess the displacement of______.
A)
rotation
B)
distortion
C)
translation
D)
All of the above

Correct Answer :   All of the above

79 .
In Chezy's formula V = C √mi
A)
m is the hydraulic mean depth
B)
V is the mean velocity of flow
C)
i is the loss of head per unit length of pipe
D)
All of the above

Correct Answer :   All of the above

80 .
If total head available at the inlet of pipe and f₁ is the loss of head due to friction in the pipe, the maximum efficiency of transmission of power (ηmax) is
A)
1/2
B)
2/3
C)
3/4
D)
4/5

Correct Answer :   2/3

81 .
Maximum efficiency of transmission of power through a pipe, is_____.
A)
25%
B)
33.3%
C)
50%
D)
66.67%

Correct Answer :   66.67%

82 .
An ideal flow of a liquid obeys______.
A)
Continuity equation
B)
dynamic viscosity law
C)
Newton's law of viscosity
D)
Newton's second law of motion

Correct Answer :   Continuity equation

83 .
Reynold number is the ratio of initial force and_____.
A)
elasticity
B)
viscosity
C)
surface tension
D)
gravitational force

Correct Answer :   viscosity

84 .
A short tube mouthpiece will not run full at its outlet if the head under which the orifice works, is_____.
A)
less than 12.2 m of the water
B)
equal of 12.2 m of water
C)
more than 12.2 m of the water
D)
None of the above

Correct Answer :   more than 12.2 m of the water

85 .
Hydrostatic pressure on a dam depends upon its________.
A)
depth
B)
shape
C)
Both (A) and (B)
D)
material

Correct Answer :   Both (A) and (B)

86 .
A cylinder 3 m in diameter and 4 m long retains water one side as shown in the below figure. If the weight of the cylinder is 2000 kgf, the horizontal reaction at B is
A)
10,000 kgf
B)
15,000 kgf
C)
20,000 kgf
D)
18,000 kgf

Correct Answer :   18,000 kgf

87 .
Inside pressure in a hollow soap bubble in the air is : (where d is the diameter of the bubble)______
A)
4σ / d
B)
8σ / d
C)
6σ / d
D)
2σ / d

Correct Answer :   8σ / d

88 .
For solving the problems is hydraulic engineering, the velocity used is_____.
A)
average velocity of flow over a section
B)
velocity at the centre of pipe section
C)
mean of the velocities at the centre and that along the pipe surface
D)
None of the above

Correct Answer :   average velocity of flow over a section

89 .
The shape of fire hose nozzle is generally kept
A)
convergent
B)
divergent
C)
cylindrical
D)
convergent divergent

Correct Answer :   convergent

90 .
If v₁ and v₂ are the velocities of flow before and after sudden enlargement in a pipe, the head loss given by Carnot and Borda equation, is______.
A)
(v₂ - v₁)²/2g
B)
(v₁ + v₂)²/2g
C)
(v₂² - v₁²)/2g
D)
(v₁ - v₂)²/2g

Correct Answer :   (v₁ - vâ‚‚)²/2g

91 .
The flow in open channel is said to be critical if the Froude number is :
A)
equal to 1.0
B)
less than 1.0
C)
greater than 1.0
D)
None of the above

Correct Answer :   equal to 1.0

92 .
Equation of continuity of fluids is applicable only if_______.
A)
flow is steady
B)
flow is compressive
C)
flow is one dimensional
D)
All of the above

Correct Answer :   All of the above

Explanation : * flow is steady
* flow is compressive
* flow is one dimensional
* velocity is uniform over the cross-sections

93 .
The continuity equation
A)
expresses the relationship between work and energy
B)
relates mass rate of flow along a stream line
C)
relates the momentum per unit volume between two points on a stream line
D)
requires that Newton's second law of motion be satisfied at every point in fluid

Correct Answer :   relates mass rate of flow along a stream line

94 .
Water displaced by a floating wooden block of density 0.75, 5 m long, 2 m wide and 3 m high, is______.
A)
17.5 m³
B)
20.0 m³
C)
22.5 m³
D)
25 km³

Correct Answer :   22.5 m

95 .
In pipe lines, a surge tank is provided____.
A)
to provide additional water head
B)
to remove the frictional loss in pipe
C)
to relieve the pressure due to water hammer
D)
to overflow the pipe line when suddenly closed

Correct Answer :   to relieve the pressure due to water hammer

96 .
Total head of a liquid particle in motion is the sum of_____.
A)
kinetic head and pressure head
B)
potential head and kinetic head
C)
potential head and pressure head
D)
potential head, kinetic head and pressure head

Correct Answer :   potential head, kinetic head and pressure head

97 .
The velocity distribution of viscous fluid through a circular/pipe is :
A)
parabolic
B)
circular
C)
hyperbolic
D)
elliptical

Correct Answer :   parabolic

98 .
Mercury is generally used in barometers because_______.
A)
its vaour pressure is practically zero
B)
the height of the barometer will be less
C)
Both (A) and (B)
D)
it is a best liquid

Correct Answer :   Both (A) and (B)

99 .
Flow in pipes is laminar if Reynold number is______.
A)
more than 3000
B)
less than 2100
C)
between 2100 and 3000
D)
All of the above

Correct Answer :   less than 2100

100 .
In flow, the liquid particles may possess________.
A)
kinetic energy
B)
pressure energy
C)
potential energy
D)
All of the above

Correct Answer :   All of the above

101 .
Euler's equation for the motion of liquids assumes that________.
A)
fluid is viscous
B)
fluid is homogeneous and incompressible
C)
flow is unsteady along the stream line
D)
velocity of flow is non-uniform over the section

Correct Answer :   fluid is homogeneous and incompressible

102 .
The height of water level in a tank above the centre of a circular hole 2.5 cm in diameter is 50 m. The velocity of water flowing through the hole, is______.
A)
31.1 m/sec
B)
31.2 m/sec
C)
31.3 m/sec
D)
31.4 m/sec

Correct Answer :   31.3 m/sec

103 .
A steady uniform flow is through________.
A)
a long pipe at constant rate
B)
a long pipe at decreasing rate
C)
an expanding tube at constant rate
D)
an expanding tube at increasing rate

Correct Answer :   a long pipe at constant rate

104 .
Most economical section of a circular channel for maximum velocity, is if,_______.
A)
depth of water = 0.810 diameter
B)
wetted perimeter = 2.245 diameters
C)
hydraulic mean depth = 0.304 diameter
D)
All of the above

Correct Answer :   All of the above

105 .
For a most economical rectangular channel, the width of the channel must be______.
A)
half the depth of flow
B)
twice the depth of flow
C)
equal to depth of flow
D)
None of the above

Correct Answer :   twice the depth of flow

106 .
The hydrostatic force acts through______.
A)
metacentre
B)
centre of top edge
C)
centre of pressure
D)
centre of bottom edge

Correct Answer :   centre of pressure

107 .
In an inclined position, a venturimeter records_____.
A)
same reading
B)
less reading
C)
more reading
D)
None of the above

Correct Answer :   same reading

108 .
In a short cylindercial external mouthpiece, the venacontracta occurs at a distance from the outlet of orifice equal to_______.
A)
diameter of the orifice
B)
one-third the diameter of the orifice
C)
two-third the diameter of the orifice
D)
one-fourth the diameter of the orifice

Correct Answer :   one-fourth the diameter of the orifice

109 .
If the pressure at the inlet of a pipe is 90 kg/cm² and pressure drop over the pipe line is 10 kg/cm², the efficiency of transmission, is______.
A)
55.5%
B)
66.6%
C)
77.7%
D)
88.8%

Correct Answer :   88.8%

110 .
Pick up the incorrect statement from to following regarding triangular notch :
A)
Ventilation is necessary
B)
For measuring low discharge, it gives more accurate result
C)
Only one reading (i.e. H) is required for computation of discharge
D)
None of the above

Correct Answer :   Ventilation is necessary

111 .
The flow in a channel is said to be non-uniform, if____________.
A)
free water surface of an open channel is not parallel to the bed of channel
B)
head needed to overcome frictional reistance is less than the drop in elevation of channel bed
C)
head needed to overcome frictional resistance is more than the drop in elevation of channel bed
D)
All of the above

Correct Answer :   All of the above

112 .
If H is the depth of water retained by a vertical wall, the height of centre of pressure above the bottom is_____.
A)
H/2
B)
H/3
C)
H/5
D)
2H/3

Correct Answer :   H/2

113 .
For maximum power transmission through a nozzle, (where hf is the head lost due to friction)
A)
hf = H/2
B)
hf = H/3
C)
hf = H/4
D)
hf = H/5

Correct Answer :   hf = H/3

114 .
Mass density of liquid (ρ) is given by
A)
ρ = Mass / Volume
B)
ρ = Metric slug / m²
C)
ρ = kg sec³ / m⁴
D)
All of the above

Correct Answer :   All of the above

115 .
'Flow net' can be drawn only if the flow is_______.
A)
turbulent
B)
rotational
C)
distortion
D)
None of the above

Correct Answer :   distortion

116 .
For solving network problems of pipes, necessary condition is_______.
A)
energy equation
B)
continuity equation
C)
Darcy-Weisbach equation
D)
All of the above

Correct Answer :   All of the above

117 .
In a fluid flow a particle may posses_______.
A)
kinetic energy
B)
pressure energy
C)
initial energy
D)
All of the above

Correct Answer :   All of the above

Explanation : * kinetic energy
* pressure energy
* initial energy
* elevation energy

118 .
In two dimensional flow the components of velocity are given by u = ax; v = by. The stream lines will be_____.
A)
circular
B)
hyperbolic
C)
parabolic
D)
elliptical

Correct Answer :   hyperbolic

119 .
The discharge through a V-notch weir varies as
A)
√H
B)
1/√H
C)
H3/2
D)
H7/2

Correct Answer :   H7/2

120 .
For a most economical rectangular channel, the hydraulic mean depth, is equal to
A)
the depth of flow
B)
one-third depth of flow
C)
half the depth of flow
D)
None of the above

Correct Answer :   half the depth of flow

121 .
The instrument used for measuring the velocity of flow, is known as_____.
A)
pitot tube
B)
venturimeter
C)
orifice meter
D)
None of the above

Correct Answer :   pitot tube

122 .
For a long pipe, the head loss________.
A)
at the outlet is ignored
B)
at the entrance is ignored
C)
due to friction is ignored
D)
at the entrance and outlet both are ignored

Correct Answer :   at the entrance and outlet both are ignored

123 .
On a flow net diagram, the distance between two consecutive steam lines at two successive sections are 1 cm and 0.5 cm respectively. If the velocity at the first section is 1 m/sec, the velocity at the second is
A)
0.5 m/sec
B)
1.0 m/sec
C)
2.0 m/sec
D)
2.5 m/sec

Correct Answer :   2.0 m/sec

124 .
The flow is called rotational if its velocity normal to the plane of area is equal to_______.
A)
angular velocity vector
B)
twice the angular velocity vector
C)
thrice the angular velocity vector
D)
None of the above

Correct Answer :   twice the angular velocity vector

125 .
Flow of water in pipes of diameter more than 3 metres, can be measured by____.
A)
pitot tube
B)
venturimeter
C)
rotameter
D)
orifice plate

Correct Answer :   rotameter

126 .
Hydraulic grade line_____.
A)
remains above the centre line of conduit
B)
remains below the centre line of conduit
C)
remains parallel to the centre line of conduit
D)
may be above or below the centre line of conduit

Correct Answer :   may be above or below the centre line of conduit

127 .
Piezometers are used to measure_____.
A)
very low pressure
B)
atmospheric pressure
C)
difference in pressure at two points
D)
pressure in water channels, pipes etc

Correct Answer :   very low pressure

128 .
Atmospheric pressure is equal to water column head of
A)
9.81 m
B)
10.30 m
C)
5.0 m
D)
7.5 m

Correct Answer :   10.30 m

129 .
Shear stress is directly proportional to
A)
the velocity
B)
the velocity
C)
the viscosity
D)
the shear strain

Correct Answer :   the shear strain

130 .
To avoid an interruption in the flow of a syphon, an air vessel is provided
A)
at the inlet
B)
at the outlet
C)
at the summit
D)
at any point between intet and outlet

Correct Answer :   at the summit

131 .
Uniform flow is said to occur when
A)
size and shape of the cross-section change along a length
B)
size and shape of the cross-section in a particular length remain constant
C)
frictional loss in the particular length of the channel, will be less than the drop in elevation
D)
frictional loss in the particular length of the channel will the more than the drop in its elevation

Correct Answer :   size and shape of the cross-section in a particular length remain constant

132 .
Molecules of fluids get attracted due to_______.
A)
adhesion
B)
cohesion
C)
surface tension
D)
capillarity action

Correct Answer :   adhesion

133 .
The momentum correction factor (β) for the viscous flow through a circular pipe is
A)
1.66
B)
1.50
C)
1.33
D)
1.25

Correct Answer :   1.33

134 .
A piezometer opening in pipes measures
A)
velocity head
B)
static pressure
C)
total pressure
D)
negative static pressure

Correct Answer :   static pressure

135 .
An independent mass of a fluid does not posses
A)
kinetic energy
B)
elevation energy
C)
Both (A) and (B)
D)
pressure energy

Correct Answer :   pressure energy

136 .
The ratio of maximum velocity to average velocity of viscous fluid through a circular pipe is
A)
0.5
B)
0.75
C)
1.25
D)
2.00

Correct Answer :   2.00

137 .
The shear stress distribution in viscous fluid through a circular pipe is :
A)
same throughout the section
B)
maximum at the centre
C)
maximum at the inside of surface
D)
None of the above

Correct Answer :   same throughout the section

138 .
The side slope of Cipolletti weir is generally kept
A)
1 to 2
B)
1 to 3
C)
1 to 4
D)
1 : 5

Correct Answer :   1 to 4

139 .
One metric slug is equal to______.
A)
0.98 kg wt
B)
9.81 kg mass
C)
9.81 kg wt
D)
1 kg wt

Correct Answer :   9.81 kg mass

140 .
Falling drops of water become spheres due to
A)
adhesion
B)
cohesion
C)
viscosity
D)
surface tension

Correct Answer :   surface tension

141 .
If the Mach number for a fluid flow is less than 1, the flow is
A)
sonic
B)
sub-sonic
C)
supersonic
D)
None of the above

Correct Answer :   sub-sonic

142 .
Hydraulic coefficient of an orifice means the coefficient of_______.
A)
velocity
B)
resistance
C)
contraction
D)
All of the above

Correct Answer :   All of the above

143 .
In a venturimeter, the divergent cone is kept_______.
A)
equal to covergent cone
B)
shorter than convergent cone
C)
longer than convergent cone
D)
None of the above

Correct Answer :   longer than convergent cone

144 .
Specific weight of sea water is more than that of pure water because of
A)
dissolved air
B)
dissolved salts
C)
suspended matter
D)
All of the above

Correct Answer :   All of the above

145 .
Total pressure on the top of a closed cylindrical vessesl completely filled with liquid, is directly proportional to
A)
(radius)⁴
B)
(radius)³
C)
(radius)²
D)
radius

Correct Answer :   (radius)⁴

146 .
Energy equation is usually applicable to______.
A)
steady flow
B)
laminar flow
C)
turbulent flow
D)
non-uniform flow

Correct Answer :   steady flow

147 .
Poise is the unit of_______.
A)
mass density
B)
viscosity
C)
velocity gradient
D)
kinematic viscous

Correct Answer :   viscosity

148 .
Two dimensional flow occurs when
A)
the direction and magnitude of the velocity at all points are identical
B)
the magnitude and direction of the velocity do not change from point to point in the fluid
C)
the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
D)
the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Correct Answer :   the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

149 .
Surface tension has the units of
A)
newtons
B)
newtons/m
C)
newtons/cm
D)
newtons/m²

Correct Answer :   newtons/m

150 .
The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is
A)
2 / 3
B)
1 / 4
C)
1 / 3
D)
1 / 2

Correct Answer :   1 / 3

151 .
Cappoletti weir is a
A)
trapezoidal weir, whose sides slope 1 horizontal to 2 verticals
B)
triangular weir whose notch angle is 90°
C)
a combination of rectangular and triangular weirs
D)
rectangular weir whose length is kept 3 times the height of the water above sill

Correct Answer :   trapezoidal weir, whose sides slope 1 horizontal to 2 verticals

152 .
On an inclined plane, centre of pressure is located
A)
at the centroid
B)
below the centroid
C)
anywhere
D)
above the centroid

Correct Answer :   below the centroid

153 .
Discharge over an ogee weir remains the same as that of
A)
triangular weir
B)
drowned weir
C)
sharp crested weir
D)
cippoletti weir

Correct Answer :   cippoletti weir

154 .
When no air is left below the nappe and water stream adheres to the down stream face of the weir, it is known as
A)
clinging nappe
B)
free nappe
C)
depressed nappe
D)
None of the above

Correct Answer :   clinging nappe

155 .
The best side slope for most economical trapezoidal section, is
A)
30°
B)
45°
C)
60°
D)
None of the above

Correct Answer :   60°

156 .
Most economical section of a circular channel for maximum discharge________.
A)
wetted perimeter = 2.83 depth of water
B)
depth of water = 0.95 diameter of circular section
C)
ydraulic mean depth = 0.286 diameter of circular section
D)
All of the above

Correct Answer :   All of the above

Explanation : * wetted perimeter = 2.83 depth of water
* depth of water = 0.95 diameter of circular section
* hydraulic mean depth = 0.286 diameter of circular section
* wetted perimeter = 2.6 diameter of circular section

157 .
Unit of kinematic viscosity is_____.
A)
m²/sec
B)
Kg sec/m²
C)
Newton sec/m²
D)
Newton sec/m³

Correct Answer :   m²/sec

158 .
Critical depth (h) of a channel, is_____.
A)
h = v/g
B)
h = v²/g
C)
h = v/2g
D)
h = v²/2g

Correct Answer :   h = v²/g

159 .
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at its centroid, if
A)
area is vertical
B)
area is inclined
C)
area is horizontal
D)
All of the above

Correct Answer :   All of the above

160 .
If the volume of a liquid weighing 3000 kg is 4 cubic metres, 0.75 is its_____.
A)
specific mass
B)
specific weight
C)
specific gravity
D)
None of the above

Correct Answer :   specific gravity

161 .
The most efficient channel section, is
A)
triangular
B)
rectangular
C)
semi-circular
D)
half hexagon in the form of trapezoid

Correct Answer :   half hexagon in the form of trapezoid

162 .
With a clinging nappe of a weir, the excess discharge, is
A)
30% to 40%
B)
25% to 30%
C)
18% to 20%
D)
8% to 10%

Correct Answer :   25% to 30%

163 .
For steady flow in open channels, which one of the following does not change :
A)
depth of flow
B)
rate of flow
C)
velocity of flow
D)
All of the above

Correct Answer :   All of the above

164 .
To ensure that water does not rise more than 100 cm above the crest, for a discharge of 5.00 m3/sec, the length of water will be
A)
2.49 m
B)
2.50 m
C)
2.51 m
D)
2.55 m

Correct Answer :   2.49 m

165 .
For a most economical trapezoidal open channel, the half of the top width must be equal to
A)
the bed width
B)
the depth of flow
C)
one sloping side
D)
None of the above

Correct Answer :   one sloping side

166 .
The value of kinetic energy correction factor (a) for a laminar flow through a circular pipe, is
A)
1.0
B)
l.5
C)
2.0
D)
2.5

Correct Answer :   2.0

167 .
Chezy's formula is used to determine
A)
velocity of flow in pipe
B)
velocity of flow in open channels
C)
head loss due to friction in pipe
D)
None of the above

Correct Answer :   velocity of flow in open channels

168 .
The metacentric height of a body equals the distance between_______.
A)
the metacentre and centre of gravity
B)
the centre of buoyancy and metacentre
C)
the centre of gravity and centre of buoyancy
D)
None of the above

Correct Answer :   the metacentre and centre of gravity

169 .
Cavitation is caused by
A)
High pressure
B)
High velocity
C)
Low velocity
D)
Low pressure

Correct Answer :   Low pressure

170 .
Mach number is the ratio of inertia force to
A)
elasticity
B)
viscosity
C)
surface tension
D)
gravitational force

Correct Answer :   elasticity

171 .
The main assumption of Bernoulli's equation is :
A)
There is no loss of energy of the liquid while flowing
B)
No external force except the gravity acts on the liquid
C)
The velocity of energy of liquid particle, across any cross-section of a pipe is uniform
D)
All of the above

Correct Answer :   All of the above

172 .
Bernoulli's equation assumes that
A)
flow is steady
B)
fluid is homogeneous
C)
fluid is non-viscous
D)
All of the above

Correct Answer :   All of the above

173 .
A syphon is used
A)
to supply water to a town from higher level to lower level
B)
to connect water reservoirs at different levels intervened by a hill
C)
to fill up a tank with water at higher level from a lower level
D)
All of the above

Correct Answer :   to connect water reservoirs at different levels intervened by a hill

174 .
A pitot tube is used to measure
A)
pressure
B)
difference in pressure
C)
velocity of flow
D)
None of the above

Correct Answer :   velocity of flow

175 .
Discharge through a totally submerged orifice, is directly proportional to
A)
square root of the opening
B)
reciprocal of the area of the opening
C)
square root of the difference in elevation of water surface
D)
difference in elevation of water surfaces

Correct Answer :   square root of the difference in elevation of water surface

176 .
The length of hydraulic jump is roughly
A)
5 to 7 times its height
B)
3 to 5 times its height
C)
2 to 3 times its height
D)
All of the above

Correct Answer :   5 to 7 times its height

177 .
A spherical load 900 kg is rolled through 9.8 m across the deck of a ship weighing 10, 000 kg. If the metacentric height of the ship is 5 metres, the angle of heel, is
A)
10° 20'
B)
10° 15'
C)
10° 10'
D)
10° 5'

Correct Answer :   10° 15'

178 .
Pick up the correct statement from the following :
A)
In incompressible flow the density of a fluid remains constant
B)
In compressible flow, the density of a fluid changes from point to point
C)
In uniform flow, the velocity of a fluid does not change with respect to length of flow direction
D)
All of the above

Correct Answer :   All of the above

179 .
The pressure less than atmospheric , pressure, is known
A)
vacuum pressure
B)
suction pressure
C)
negative gauge pressure
D)
All of the above

Correct Answer :   All of the above

180 .
A rise or fall of liquid in a glass tube of a very small diameter when dipped is
A)
directly proportional to the specific weight of liquid
B)
direcly proportional to the sine of the angle of contact
C)
inversely proportional to the diameter of the glass tube
D)
directly proportional to the force per unit length of periphery

Correct Answer :   directly proportional to the specific weight of liquid

181 .
To measure very low pressure, we use
A)
barometers
B)
piezometers
C)
manometers
D)
differential manometers

Correct Answer :   manometers

182 .
The valve closure is said to be sudden if
A)
t < L/C
B)
t < 2L/C
C)
t < 3L/C
D)
t < 5L/C

Correct Answer :   t < 2L/C

183 .
For critical depth of flow of water in open channels, fc the specific energy must be :
A)
minimum
B)
maximum
C)
average of maximum and minimum
D)
None of the above

Correct Answer :   minimum

184 .
If the forces are due to inertia and gravity, and frictional resistance plays only a minor role, the design of the channels is made by comparing
A)
Mach number
B)
Weber number
C)
Froude number
D)
Reynold number

Correct Answer :   Froude number

185 .
The discharge over a Cipolletti weir of length 2.185 m when the head over the weir is 1 m, is
A)
2.0 m³
B)
2.5 m³
C)
3.0 m³
D)
4.0 m³

Correct Answer :   4.0 m³

186 .
The velocity of the fluid particle at the centre of the pipe section, is
A)
minimum
B)
maximum
C)
equal throughout
D)
None of the above

Correct Answer :   maximum

187 .
Due to decrease of diameter of the droplet, inside pressure intensity
A)
increases
B)
decreases
C)
remains unaffected
D)
None of the above

Correct Answer :   increases

188 .
In order to avoid capillary correction, the minimum diameter of a manometer used for measuring pressure, should be
A)
4 mm
B)
6 mm
C)
8 mm
D)
10 mm

Correct Answer :   6 mm

189 .
The flow in open channel is laminar if the Reynold number is
A)
1000
B)
more than 500
C)
less than 500
D)
None of the above

Correct Answer :   less than 500

190 .
Centre of buoyancy is
A)
centroid of the floating body
B)
centre of pressure of the displaced liquid
C)
centroid of the fluid displaced
D)
None of the above

Correct Answer :   centroid of the fluid displaced

191 .
The intensity of pressure due to sudden closure of a valve of a pipe in which water flows with velocity v, is directly proportional to :
A)
specific weight of water
B)
bulk modulus of elasticity of water
C)
square root of the bulk modulus of elasticity of water
D)
None of the above

Correct Answer :   square root of the bulk modulus of elasticity of water

192 .
Total energy line is
A)
datum head
B)
kinetic head
C)
pressure head
D)
All of the above

Correct Answer :   All of the above

193 .
For critical flow, the Froude number is :
A)
1.0
B)
less than 1.0
C)
more than 1.0
D)
2

Correct Answer :   1.0

194 .
For mountaneous regions having steep slope, wagons for carrying liquid are made with bottom
A)
parallel to the road surface
B)
parallel to the horizontal surface
C)
inclined upward while moving upwards
D)
inclined downward while moving downwards

Correct Answer :   parallel to the horizontal surface

195 .
The upper surface of the weir over which water flows, is known as
A)
vein
B)
sill
C)
nappe
D)
None of the above

Correct Answer :   sill

196 .
The ratio of the inertia and viscous forces acting in any flow, ignoring other forces, is called
A)
Frode number
B)
Euler number
C)
Reynold number
D)
Weber number

Correct Answer :   Reynold number

197 .
To avoid the tendency of separation of liquid flow, the most suitable ratio of the diameters of the throat and the pipe, is
A)
1/3 to 1/2
B)
1/2 to 3/4
C)
1/4 to 1/8
D)
None of the above

Correct Answer :   1/3 to 1/2

198 .
The density of water is 1000 kg/m³ at
A)
0°C
B)
0°K
C)
4°C
D)
20°C

Correct Answer :   4°C

199 .
A large Roynold number is indication of
A)
laminar flow
B)
turbulent flow
C)
smooth and streamline flow
D)
highly turbulent flow

Correct Answer :   highly turbulent flow

200 .
To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than
A)
10.0 m above the hydraulic gradient
B)
6.4 m above the hydraulic gradient
C)
5.0 above the hydraulic gradient
D)
2.4 m above the hydraulic gradient

Correct Answer :   6.4 m above the hydraulic gradient

201 .
The following is not a laminar flow
A)
Flow in water pipe lines
B)
Flow in beds in ground water
C)
Flow of oil in measuring instruments
D)
Rise of water in plants through roots

Correct Answer :   Flow in water pipe lines

202 .
Which one of the following statements is true?
A)
The value of kinetic energy correction factor for laminar flow is 2
B)
The practical value of kinetic energy correction factor for turbulent flow is unity
C)
The value of kinetic energy correction factor for turbulent flow lies between 1.03 to 1.06
D)
All of the above

Correct Answer :   All of the above

203 .
Atmospheric pressure varies with
A)
altitude
B)
temperature
C)
weather conditions
D)
All of the above

Correct Answer :   All of the above

204 .
If velocities of fluid particles vary from point to point in magnitude and direction, as well as from instant to instant, the flow is said to be
A)
laminar
B)
uniform flow
C)
turbulent flow
D)
non-uniform flow

Correct Answer :   turbulent flow

205 .
The rise of the liquid along the walls of a revolving cylinder above the initial level, is
A)
lesser than the depression of the liquid at the axis of rotation
B)
the same as the depression of the liquid at the axis of rotation
C)
greater than the depression of the liquid at the axis of rotation
D)
None of the above

Correct Answer :   the same as the depression of the liquid at the axis of rotation

206 .
Fluids change the volume under external presssure due to
A)
viscosity
B)
plasticity
C)
compressibility
D)
None of the above

Correct Answer :   compressibility

207 .
The thickness of a sharp crested weir is kept less than
A)
one-half of the height of water on the sill
B)
one-third of the height of water on the sill
C)
one-fourth of the height of water on the sill
D)
two-third of the height of water on the sill

Correct Answer :   one-half of the height of water on the sill

208 .
If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm2, the pressure at a depth of 2.5 m, is
A)
1 metre of water
B)
2 metres of water
C)
3 metres of water
D)
3.5 metres of water

Correct Answer :   3 metres of water

209 .
Water flows through a convergent mouthpiece of diameter 4 cm at convergence under a head of 3 metres. If the maximum vacuum pressure is 9 metres of water, the maximum diameter of divergence, to aviod separation of flow, is
A)
2√3 cm
B)
√2 cm
C)
4 cm
D)
6 cm

Correct Answer :   √2 cm

210 .
In C.G.S. system the units of kinematic viscosity, is
A)
poise
B)
Newton
C)
Both (A) and (B)
D)
stoke

Correct Answer :   stoke

211 .
A triangular notch is preferred to a rectangular notch because
A)
only one reading is required
B)
its formula is simple to remember
C)
it measures a wide range of flows accurately
D)
All of the above

Correct Answer :   All of the above

212 .
In case of laminar flow through a circular pipe,
A)
momentum correction factor is 1.33
B)
energy correction factor is 2.00
C)
Both (A) and (B)
D)
None of the above

Correct Answer :   Both (A) and (B)

213 .
When water flows over a rectangular suppressed weir, the negative pressure created beneath the nappe
A)
increases the discharge
B)
decreases the discharge
C)
does not effect the discharge
D)
None of the above

Correct Answer :   increases the discharge

214 .
Barometres are used to measure
A)
very low pressure
B)
atmospheric pressure
C)
very high pressure
D)
difference in pressure at two points

Correct Answer :   atmospheric pressure

215 .
For most economical rectangular section of a channel, the depth is kept
A)
half the width
B)
hydraulic mean depth
C)
one-fourth of the width
D)
three times the hydraulic radius

Correct Answer :   half the width

216 .
In a centrifugual pump casing, the flow of water leaving the impeller, is
A)
radial flow
B)
forced vertex
C)
rectilinear flow
D)
free vortex motion

Correct Answer :   free vortex motion

217 .
The ratio of the hydraulic radius of a pipe running full to the hydraulic radius of a square section of a channel whose side is equal to the diameter of the pipe, is
A)
1/2
B)
1/3
C)
3/4
D)
None of the above

Correct Answer :   3/4

218 .
A body of dimensions 1.5 m x 1.0 m x 2 m weighs 3000 kg in water. Its specific gravity is
A)
1.1
B)
1.0
C)
0.9
D)
0.8

Correct Answer :   1.1

219 .
An orifice is called a large orifice if water head, is
A)
four times the diameter of the orifice
B)
five times the diameter of the orifice
C)
twice the diameter of the orifice
D)
thrice the diameter of the orifice

Correct Answer :   five times the diameter of the orifice

220 .
When a liquid rotates at constant angular velocity about a vertical axis of a rigid body, the pressure
A)
increases linearly to its radial distance
B)
varies as the square of the radial distance
C)
decreases as the square of the radial distance
D)
varies inversely as the altitude along any vertical line

Correct Answer :   varies as the square of the radial distance

221 .
For the two dimensional flow, the stream function is given by ψ = 2xy. The velocity at a point (3, 4) is
A)
10 m/sec
B)
12 m/sec
C)
15 m/sec
D)
18 m/sec

Correct Answer :   10 m/sec

222 .
A floating body attains stable equilibrium if its metacentre is
A)
anywhere
B)
at the centroid
C)
below the centroid
D)
above the centroid

Correct Answer :   above the centroid

223 .
The unit of the viscosity is
A)
kg sec/m²
B)
m² per sec
C)
Newton-sec²/m³
D)
Newton sec per m²

Correct Answer :   Newton sec per m²

224 .
Dimensions of the dynamic viscosity (μ) are
A)
MLT⁻²
B)
ML⁻¹T⁻²
C)
ML⁻¹T⁻¹
D)
M-1L⁻¹T⁻¹

Correct Answer :   ML⁻¹T⁻¹

225 .
To avoid vapourisation, pipe lines are laid over the ridge so that these are above the hydraulic gradient line, not more than
A)
10.0 m
B)
6.4 m
C)
5.0 m
D)
2.4 m

Correct Answer :   6.4 m

226 .
A jet projected at an angle of 45θ, 40 m from the foot of a vertical column, just reaches the top of the column. The height of the column is
A)
40 m
B)
30 m
C)
20 m
D)
15 m

Correct Answer :   40 m

227 .
The maximum vacuum created at the summit of a syphon is
A)
2.7 m of water
B)
5.5 m of water
C)
7.4 m of water
D)
None of the above

Correct Answer :   7.4 m of water

228 .
In fluids, steady flow occurs when
A)
conditions of flow change steadily with time
B)
velocity vector remains constant at a point
C)
conditions of flow remain the same at adjacent point
D)
conditions of flow do not change with time at a point

Correct Answer :   conditions of flow do not change with time at a point

229 .
A cylinder 3 m in diameter and 4 m long retains water one side as shown in the below figure. If the weight of the cylinder is 2000 kgf, the vertical reaction at A is
A)
5,863 kgf
B)
14,137 kgf
C)
18,000 kgf
D)
20,000 kgf

Correct Answer :   5,863 kgf

230 .
From a nozzle exposed to atmosphere, the liquid jet traverses
A)
a parabolic path
B)
a circular path
C)
a straight line
D)
an elliptical path

Correct Answer :   a parabolic path

231 .
For exerting a pressure of 4.8 kg/cm², the depth of oil (specific gravity 0.8), should be
A)
76 cm
B)
60 cm
C)
56 cm
D)
41 cm

Correct Answer :   60 cm

232 .
For the flow of liquid from an open ended tube (or nozzle) leading to the formation of spray of liquid drops, the number generally applied, is
A)
Mach number
B)
Weber number
C)
Froude number
D)
Reynold number

Correct Answer :   Weber number

233 .
An error of 1% in measuring the head of water over the crest of a triangular notch, produces an error in the discharge which is equal to
A)
1.5%
B)
2.0%
C)
2.5%
D)
4.5%

Correct Answer :   2.5%

234 .
A closed cylindrical vessel of 100 cm diameter and 200 cm high is completely filled with a liquid (sp. weight 1600 kg/m3) when rotated about its vertical axis at 100 r.p.m. The total pressure on its lid, is
A)
459 kg
B)
549 kg
C)
945 kg
D)
954 kg

Correct Answer :   954 kg

235 .
An orifice is taken as large if
A)
(H₂ - H₁) > H
B)
(H₂ - H₁) > H/2
C)
(H₂ - H₁) > H/4
D)
(H₂ - H₁) > H/3

Correct Answer :   (Hâ‚‚ - H₁) > H/3