Mechanical Engineering - Workshop Technology Quiz (or) MCQ

1 .

In a cold chamber die casting machine

A) melting pot may have any location

B) low temperature and pressure is used

C) melting pot is separate from the machine

D) melting pot is an integral part of the machine

Correct Answer : melting pot is separate from the machine

2 .

In welding magnesium with TIG arc welding, direct current with __________ is used.

A) straight polarity

B) reversed polarity

C) Can Not Say

D) None of the above

Correct Answer : reversed polarity

3 .

The casting method adopted for ornaments and toys of non-ferrous alloys, is

A) die casting

B) slush casting

C) centrifugal casting

D) permanent mould casting

Correct Answer : slush casting

4 .

Structural sections such as rails, angles, I-beams are made by

A) hot rolling

B) hot piercing

C) hot drawing

D) hot extrusion

Correct Answer : hot rolling

5 .

The type of file used for a wood work is

A) single-cut file

B) double cut file

C) Both (A) and (B)

D) rasp-cut file

Correct Answer : rasp-cut file

6 .

A taper provided on the pattern for its easy and clean withdrawl from the mould is known as

A) draft allowance

B) shrinkage allowance

C) distortion allowance

D) machining allowance

Correct Answer : draft allowance

7 .

The minimum size of a billet is 10 cm x 10 cm.

A) Agree

B) Disagree

C) Can Not Say

D) None of the above

Correct Answer : Disagree

8 .

A zinc diffusion process is called

A) anodising

B) parkerising

C) sherardizing

D) galvanising

Correct Answer : sherardizing

9 .

The accuracy of micrometers, calipers, dial indicators can be checked by a

A) ring gauge

B) plug gauge

C) slip gauge

D) feeler gauge

Correct Answer : slip gauge

10 .

The operation of cutting of a flat sheet to the desired shape is called

A) blanking

B) piercing

C) punching

D) shearing

Correct Answer : shearing

11 .

Extrusion

A) is extensively used for making bolts and nuts

B) is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface

C) is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work

D) consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part

Correct Answer : consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part

12 .

The dowels are

A) box nails

B) wooden nails

C) wire nails

D) None of the above

Correct Answer : wooden nails

13 .

In arc welding, the temperature of heat produced by the electric arc is of the order of

A) 3000° C to 4000° C

B) 4000° C to 5000° C

C) 5000° C to 6000° C

D) 6000° C to 7000° C

Correct Answer : 6000° C to 7000° C

14 .

The process of decreasing the cross-section of a bar and increasing its length, is called

A) spinning

B) peening

C) drawing down

D) upsetting

Correct Answer : drawing down

15 .

The metal patterns as compared to wooden patterns require less

A) draft allowance

B) machining allowance

C) distortion allowance

D) shrinkage allowance

Correct Answer : draft allowance

16 .

The temperature of the inner luminous cone of neutral flame is about

A) 1000° C

B) 1250° C

C) 2100° C

D) 3200° C

Correct Answer : 3200° C

17 .

A casting defect which occurs due to improper venting of sand is known as

A) shift

B) blow holes

C) swell

D) cold shuts

Correct Answer : blow holes

18 .

Swab is used for

A) cleaning the moulding sand

B) smoothing and cleaning out depressions in the mould

C) reinforcement of sand in the top part of the moulding box

D) moistening the sand around the edge before removing pattern

Correct Answer : moistening the sand around the edge before removing pattern

19 .

In a unilateral system of tolerance, the tolerance is allowed on

A) one side of the nominal size

B) one side of the actual size

C) both sides of the actual size

D) both sides of the nominal size

Correct Answer : one side of the nominal size

20 .

For obtaining a cup of diameter 25 mm and height 15 mm by drawing, the size of the round blank should be approximately

A) 42 mm

B) 44 mm

C) 46 mm

D) 48 mm

Correct Answer : 46 mm

21 .

Carburising flame is used to weld

A) brass and bronze

B) steel, cast iron, copper, aluminium etc

C) hard surfacing materials such as stellite

D) All of the above

Correct Answer : hard surfacing materials such as stellite

22 .

The electrode tip diameter (d) in spot welding should be equal to (where t = Thickness of plate to be welded)

A) √t

A)

B) 1.5 √t

B)

C) 3 √t

C)

D) 6 √t

D)

Correct Answer : 6 √t

23 .

A two high rolling mill consists of two rolls which rotate

A) at different speeds and in the same direction

B) at the same speed but in opposite direction

C) at the same speed and in the same direction

D) at different speeds and in the opposite direction

Correct Answer : at the same speed but in opposite direction

24 .

Cores are used to

A) improve mould surface

B) form a part of a green sand mould

C) form internal cavities in the casting

D) All of the above

Correct Answer : All of the above

25 .

Shrinkage allowance is made by adding to external dimensions and subtracting from internal dimensions.

A) Agree

B) Disagree

C) Can Not Say

D) None of the above

Correct Answer : Agree

26 .

The drawing down is a process of __________ the cross-section of a bar.

A) increasing

B) reducing

C) Can Not Say

D) None of the above

Correct Answer : reducing

27 .

When a pattern is made in three parts, the __________ is known as a drag.

A) top part

B) middle part

C) bottom part

D) None of the above

Correct Answer : bottom part

28 .

During hot working of metals

A) poor surface finish is produced

B) scale is formed on the metal surface

C) close tolerances can not be maintained

D) All of the above

Correct Answer : All of the above

29 .

When more volume of acetylene and less volume of oxygen is supplied, then a __________ flame is obtained.

A) neutral

B) oxidising

C) carburising

D) None of the above

Correct Answer : carburising

30 .

For smoothing and cleaning out depressions in the mould, a __________ is used.

A) lifter

B) slick

C) swab

D) gagger

Correct Answer : lifter

31 .

The instrument used to measure external and internal diameter of shafts, thickness of parts and depth of holes, is

A) inside micrometer

B) vernier caliper

C) outside micrometer

D) depth gauge micrometer

Correct Answer : vernier caliper

32 .

The punch and die set up is __________ for punching and piercing operation.

A) similar

B) different

C) Can Not Say

D) None of the above

Correct Answer : similar

33 .

The brass and bronze are welded by __________ flame.

A) neutral

B) oxidising

C) carburising

D) All of the above

Correct Answer : oxidising

34 .

Projection welding is a

A) arc welding process

B) continuous spot welding process

C) multi-spot welding process

D) process used for joining round bars

Correct Answer : multi-spot welding process

35 .

The algebraic difference between the maximum limit and the basic size is called

A) upper deviation

B) lower deviation

C) actual deviation

D) fundamental deviation

Correct Answer : upper deviation

36 .

The adhesiveness is the property of a sand due to which

A) the sand grains stick together

B) it cling to the sides of a moulding box

C) it evolves a great amount of steam and other gases

D) None of the above

Correct Answer : it cling to the sides of a moulding box

37 .

A basic shaft is one whose

A) lower deviation is zero

B) lower and upper deviations are zero

C) upper deviation is zero

D) None of the above

Correct Answer : upper deviation is zero

38 .

A file with 20 teeth in 25 mm is called

A) smooth file

B) bastard file

C) second cut file

D) rough file

Correct Answer : rough file

39 .

The flux commonly used in brazing is

A) borax

B) zinc chloride

C) rosin plus alcohol

D) ammonium chloride

Correct Answer : borax

40 .

When a pattern is made in three parts, the top part, is known as a

A) drag

B) cope

C) cheek

D) None of the above

Correct Answer : cope

41 .

The increase in hardness due to cold working, is called

A) work-hardening

B) age-hardening

C) flame hardening

D) induction hardening

Correct Answer : work-hardening

42 .

In a __________ , the molten metal is poured and allowed to solidify while the mould is revolving.

A) die casting method

B) slush casting method

C) centrifugal casting method

D) permanent mould casting method

Correct Answer : centrifugal casting method

43 .

Which of the following welding method uses a pool of molten metal?

A) MIG arc welding

B) TIG arc welding

C) Submerged arc welding

D) Carbon arc welding

Correct Answer : Submerged arc welding

Explanation : This is a well established and extremely versatile method of welding. Submerged-arc welding (SAW) involves the formation of an arc between a continuously fed electrode and the work piece.

A blanket of powdered flux, which generates a protective gas shield and a slag (and may also be used to add alloying elements to the weld pool), protects the weld zone. A shielding gas is not required.

44 .

The oxygen cylinder is usually painted with

A) white colour

B) yellow colour

C) maroon colour

D) black colour

Correct Answer : black colour

45 .

A hacksaw blade cuts on the

A) return stroke

B) forward stroke

C) both forward and return strokes

D) cutting depends upon the direction of force

Correct Answer : forward stroke

46 .

Riddle is used for

A) cleaning the moulding sand

B) smoothing and cleaning out depressions in the mould

C) reinforcement of sand in the top part of moulding box

D) moistening the sand around the edge before removing pattern

Correct Answer : cleaning the moulding sand

47 .

A gimlet is a ________ tool.

A) Cutting

B) Marking

C) Boring

D) None of the above

Correct Answer : Boring

Explanation : Gimlet is a small tool for boring holes, consisting of a shaft with a pointed screw at one end and a handle perpendicular to the shaft at the other

48 .

In TIG arc welding, the welding zone is shielded by an atmosphere of

A) Helium gas

B) Argon gas

C) Either (A) or (B)

D) None of the above

Correct Answer : Either (A) or (B)

Explanation : In TIG arc welding, The weld area and electrode is protected from oxidation or other atmospheric contamination by an inert shielding gas argon or helium

49 .

The brass and bronze are welded by _________ flame.

A) Neutral

B) Carburising

C) Both (A) and (B)

D) Oxidizing

Correct Answer : Oxidizing

Explanation : A slightly oxidizing flame is used in torch brazing of steel and cast iron. A stronger oxidizing flame is used in the welding of brass or bronze.

50 .

Scribing block is used to

A) Locate the centres of round bars

B) Check the trueness of flat surfaces

C) Check the surface roughness

D) Hold the round bars during marking

Correct Answer : Check the trueness of flat surfaces

Explanation : Scribing block is a gauge consisting of a scriber mounted on an adjustable stand; used to test the accuracy of plane surfaces.

51 .

For gas welding, the pressure desired at the welding torch for acetylene is

A) 7 to 103 kN/m²

B) 70 to 280 kN/m²

C) 280 to 560 kN/m²

D) 560 to 840 kN/m²

Correct Answer : 7 to 103 kN/m²

Explanation : A welding torch head is used to weld metals those are difficult to weld by using electrode. It can be identified by having only one or two pipes running to the nozzle, no oxygen-blast trigger, and two valve knobs at the bottom of the handle letting the operator adjust the oxygen and fuel flow respectively.

For gas welding, the pressure desired at the welding torch for acetylene is 7 to 103 kN/m².

52 .

The fullers are used

A) For punching a hole

B) For finishing flat surfaces

C) To finish the punched hole

D) For necking down a piece of work

Correct Answer : For necking down a piece of work

Explanation : In metalworking, a fuller is a tool used to form metal when hot. The fuller has a rounded, either cylindrical or parabolic, nose and may either have a handle or a shank.

The shank of the lower fuller allows the fuller to be inserted into the hardy hole of the anvil.

53 .

A ring gauge is used to

A) Check the diameter of shafts or studs

B) Test the accuracy of holes

C) Check the clearance between two mating surfaces

D) All of the above

Correct Answer : Check the diameter of shafts or studs

Explanation : Ring gauge, is a cylindrical ring of a thermally stable material, often steel, whose inside diameter is finished to gauge tolerance and is used for checking the external diameter of a cylindrical object.

54 .

Cutting and forming operations can be performed in a single operation in a

A) simple die

B) compound die

C) combination die

D) progressive die

Correct Answer : combination die

55 .

A casting defect which occurs near the ingates as rough lumps on the surface of a casting is known as

A) swell

B) scab

C) shift

D) sand wash

Correct Answer : sand wash

56 .

The teeth of hacksaw blade are bent

A) towards left

B) towards right

C) may be bent in any direction

D) alternately towards right and left and every third or fourth left straight

Correct Answer : alternately towards right and left and every third or fourth left straight

57 .

For cutting brass, the hacksaw blade should have __________ teeth per 25 mm.

A) 4

B) 14

C) 24

D) 32

Correct Answer : 14

58 .

The cold chisels are made from

A) cast tool steel

B) cast iron

C) mild steel

D) high speed steel

Correct Answer : cast tool steel

59 .

Rotary swaging

A) is extensively used for making bolts and rivets

B) is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface

C) is used for reducing the diameters of round bars and tubes by rotating dies which open and close rapidly on the work

D) consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part

Correct Answer : is used for reducing the diameters of round bars and tubes by rotating dies which open and close rapidly on the work

60 .

To prevent the body of the blade from jamming in the saw cut, the teeth of blade are

A) set

B) sharpened

C) strengthened

D) All of the above

Correct Answer : set

61 .

A casting defect which results in general enlargement of a casting is known as

A) shift

B) scab

C) sand wash

D) swell

Correct Answer : swell

62 .

In arc welding, the electric arc is produced between the work and the electrode by

A) voltage

B) contact resistance

C) flow of current

D) All of the above

Correct Answer : contact resistance

63 .

In a bilateral system of tolerance, the tolerance is allowed on

A) one side of the actual size

B) one side of the nominal size

C) both sides of the nominal size

D) both sides of the actual size

Correct Answer : both sides of the nominal size

64 .

Which of the following welding process uses non-consumable electrodes?

A) TIG welding

B) MIG welding

C) Manual arc welding

D) Submerged arc welding

Correct Answer : TIG welding

65 .

The draft or taper allowance on casting is generally

A) 1 to 2 mm/m

B) 2 to 5 mm/m

C) 5 to 10 mm/m

D) 10 to 15 mm/m

Correct Answer : 1 to 2 mm/m

66 .

In a centrifugal casting method

A) core is made of sand

B) core is made of ferrous metal

C) core is made of non-ferrous metal

D) no core is used

Correct Answer : no core is used

67 .

The diaphragm moulding machine is used to

A) produce uniform packing of sand in the mould

B) give uniform sand hardness throughout the mould

C) ram the sand harder at the back of the mould and softer on the pattern face

D) ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

Correct Answer : give uniform sand hardness throughout the mould

68 .

In order to produce uniform packing of sand in the moulds, a __________ is used.

A) jolt machine

B) squeezing machine

C) sand slinger

D) stripper plate machine

Correct Answer : sand slinger

69 .

The difference between the upper limit and lower limt of a dimension is called

A) basic size

B) tolerance

C) actual size

D) nominal size

Correct Answer : tolerance

70 .

Green sand is a mixture of

A) 70% sand and 30% clay

B) 50% sand and 50% clay

C) 30% sand and 70% clay

D) 90% sand and 10% clay

Correct Answer : 70% sand and 30% clay

71 .

In a hot chamber die casting machine

A) ferrous alloys with low melting temperature are casted

B) ferrous alloys with high melting temperature are casted

C) non-ferrous alloys with high melting temperature are casted

D) non-ferrous alloys with low melting temperature are casted

Correct Answer : non-ferrous alloys with low melting temperature are casted

72 .

In sheet metal blanking, shear is provided on punches and dies so that

A) press load is reduced

B) cut blanks are straight

C) good cut edge is obtained

D) warping of sheet is minimised

Correct Answer : press load is reduced

73 .

The chisel used for cutting key ways is

A) flat chisel

B) round nose chisel

C) cape chisel

D) diamond pointed chisel

Correct Answer : cape chisel

74 .

The temperature at which the new grains are formed in the metal is called

A) eutectic temperature

B) recrystallisation temperature

C) lower critical temperature

D) upper critical temperature

Correct Answer : recrystallisation temperature

75 .

Thread rolling is restricted to

A) hard materials

B) ferrous materials

C) ductile materials

D) None of the above

Correct Answer : ductile materials

76 .

A pattern is used to make the mould cavity for pouring the molten metal for casting.

A) Yes

B) No

C) Can Not Say

D) None of the above

Correct Answer : Yes

77 .

The mode of deformation of the metal during spinning is

A) bending

B) stretching

C) rolling and stretching

D) bending and stretching

Correct Answer : bending and stretching

78 .

The welding process used in joining mild steel shanks to high speed drills, is

A) seam welding

B) flash butt welding

C) spot welding

D) upset butt welding

Correct Answer : flash butt welding

79 .

The surface to be left unmachined is marked on the pattern by

A) black colour

B) red colour

C) blue colour

D) yellow colour

Correct Answer : black colour

80 .

A jolt machine is used to

A) produce uniform packing of sand in the mould

B) produce uniform sand hardness throughout the mould

C) ram the sand harder at the back of the mould and softer on the pattern face

D) ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

Correct Answer : ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

81 .

Which of the following statement is wrong?

A) The mortise gauge has two scribing pins.

A)

B) An auger is a planing tool

B)

C) The gouges are chisels with a hollow shaped blade.

C)

D) All of the above

D)

Correct Answer : An auger is a planing tool

82 .

A file removes the metal during

A) forward stroke

B) return stroke

C) both forward and return strokes

D) None of the above

Correct Answer : forward stroke

83 .

In a compound die

A) only one operation is performed at each stroke of the ram

B) two or more operations are performed simultaneously at the single stroke of the ram

C) two or more cutting operations are performed at one station of the press in every stroke of the ram

D) both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram

Correct Answer : two or more cutting operations are performed at one station of the press in every stroke of the ram

84 .

In spot welding, the spacing between two spot weld should not be less than

A) d

B) 1.5 d

C) 3 d

D) 6 d

Correct Answer : 3 d

85 .

In order to get uniform thickness of the plate by rolling process, one provides

A) offset on the rolls

B) camber on the rolls

C) antifriction bearings

D) hardening of the rolls

Correct Answer : camber on the rolls

86 .

In sheet metal work, the cutting force on the tool can be reduced by

A) providing shear on tool

B) grinding the cutting edges sharp

C) increasing the hardness of die

D) increasing the hardness of tool

Correct Answer : grinding the cutting edges sharp

87 .

Aluminium is the best material for making patterns because it is

A) easy to work

B) light in weight

C) corrosion resistant

D) All of the above

Correct Answer : All of the above

88 .

The operation of producing cup shaped parts from flat sheet metal blanks by bending and plastic flow of metal, is known as

A) drawing

B) coining

C) planishing

D) squeezing

Correct Answer : drawing

89 .

Seam weiding is a

A) arc welding process

B) multi-spot welding process

C) continuous spot welding process

D) process used for joining round bars

Correct Answer : continuous spot welding process

90 .

In fore-hand welding, the angle between the welding torch and the work is __________ as compared to back-hand welding.

A) less

B) same

C) more

D) None of the above

Correct Answer : more

91 .

The maximum flame temperature occurs

A) at the torch tip

B) at the inner cone

C) at the outer cone

D) between the outer and inner cone

Correct Answer : at the inner cone

92 .

The advantage of thermit welding is that

A) weld cools almost uniformly

B) all parts of the weld section are molten at the same time

C) results in a minimum problem with internal residual stresses

D) All of the above

Correct Answer : All of the above

93 .

A gimlet is a __________ tool.

A) boring

B) marking

C) Can Not Say

D) None of the above

Correct Answer : boring

94 .

During cold working process

A) grain structure is distorted

B) strength and hardness of metal increases

C) close dimensional tolerance can be maintained

D) All of the above

Correct Answer : All of the above

95 .

A large electrode is used in un-shielded arc welding.

A) Correct

B) Incorrect

C) Can Not Say

D) None of the above

Correct Answer : Correct

96 .

Lap joints are employed on plates having thickness

A) 12.5 mm

B) 5 to 10 mm

C) less than 3 mm

D) Above 25 mm

Correct Answer : less than 3 mm

97 .

When filing soft metals, the file teeth are clogged with minute particles of metal. The file should be cleaned by

A) rubbing on wood

B) using file card

C) washing it with water

D) washing it with dilute acid

Correct Answer : using file card

98 .

The metal is subjected to mechanical working for

A) refining grain size

B) controlling the direction of flow lines

C) reducing original block into desired shape

D) All of the above

Correct Answer : All of the above

99 .

In tungsten-inert gas arc welding, a __________ electrode is used.

A) consumable

B) non-consumable

C) Can Not Say

D) None of the above

Correct Answer : non-consumable

100 .

The electron beam welding can be carried out in

A) vacuum

B) open air

C) a shielded gas environment

D) a pressurised inert gas chamber

Correct Answer : vacuum

101 .

The operation of cutting a cylindrical hole in a sheet of metal by the punch and die is called

A) piercing

B) shearing

C) punching

D) blanking

Correct Answer : punching

102 .

The most preferred process for casting gas turbine blades is

A) die casting

B) sand casting

C) shell moulding

D) investment moulding

Correct Answer : shell moulding

103 .

A moving mandrel is used in

A) forging

B) wiredrawing

C) metal cutting

D) tube drawing

Correct Answer : tube drawing

104 .

In die casting, machining allowance is

A) small

B) large

C) very large

D) not provided

Correct Answer : not provided

105 .

The welding set up is said to have straight polarity, when

A) work is connected to the positive terminal and the electrode holder is earthed

B) work is connected to the positive terminal and the electrode holder to the negative terminal

C) work is connected to the negative terminal and the electrode holder is earthed

D) work is connected to the negative terminal and the electrode holder to the positive terminal

Correct Answer : work is connected to the positive terminal and the electrode holder to the negative terminal

106 .

The recrystallisation temperature of steel is

A) 800° C

B) 600° C

C) 400° C

D) None of the above

Correct Answer : 800° C

107 .

A file with 50 - 60 teeth in 25 mm is called bastard file.

A) True

B) False

C) Can Not Say

D) None of the above

Correct Answer : False

108 .

A basic hole is one whose

A) upper deviation is zero

B) lower and upper deviations are zero

C) lower deviation is zero

D) None of the above

Correct Answer : lower deviation is zero

109 .

Seam welding is best adopted for metal thickness ranging from

A) 8 to 10 mm

B) 5 to 8 mm

C) 3 to 5 mm

D) 0.025 to 3 mm

Correct Answer : 0.025 to 3 mm

110 .

Thermit welding is often used in

A) Replacing broken gear teeth

B) Repairing broken shears

C) Joining rails, truck frames and locomotive frames etc.

D) All of the above

Correct Answer : All of the above

Explanation : Thermit welding is a welding process that employs molten metal to permanently join the conductors.
The process employs an exothermic reaction of a thermite composition to heat the metal, and requires no external source of heat or current.
Thermit welding is often used in replacing broken gear teeth, repairing broken shears and joining rails, truck frames and locomotive frames etc.

111 .

The purpose of a riser is to

A) Feed the molten metal to the casting in order to compensate for the shrinkage

B) Act as a reservoir for the molten metal

C) Deliver molten metal into the mould cavity

D) Deliver the molten metal from pouring basin to gate

Correct Answer : Feed the molten metal to the casting in order to compensate for the shrinkage

Explanation : A riser, also known as a feeder, is a reservoir built into a metal casting mold to prevent cavities due to shrinkage.
Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify.

112 .

The upsetting is a process of

A) bending of a bar

B) increasing the cross-section of a bar

C) reducing the cross-section of a bar

D) joining the two surfaces of metal under pressure after heating

Correct Answer : increasing the cross-section of a bar

113 .

According to Indian standards, the total number of tolerance grades are

A) 8

B) 12

C) 18

D) 20

Correct Answer : 18

114 .

Which of the following material can be used for making patterns?

A) Wax

B) Lead

C) Aluminium

D) All of the above

Correct Answer : All of the above

115 .

Loam sand is a mixture of

A) 30% sand and 70% clay

B) 50% sand and 50% clay

C) 70% sand and 30% clay

D) 90% sand and 10% clay

Correct Answer : 50% sand and 50% clay

116 .

A three high rolling mill consists of three rolls placed one above the other. Which of the following statement is correct?

A) The upper and bottom rolls rotate in the same direction whereas the middle roll rotate in opposite direction.

B) The bottom and middle roll rotate in the same direction.

C) The upper and middle rolls rotate in the same direction whereas the bottom roll rotates in opposite direction.

D) All of the above

Correct Answer : The upper and bottom rolls rotate in the same direction whereas the middle roll rotate in opposite direction.

117 .

The oxy-acetylene gas used in gas welding produce a flame temperature of

A) 1800°C

B) 2100°C

C) 2400°C

D) 3200°C

Correct Answer : 3200°C

118 .

Metal patterns require __________ draft allowance than wooden patterns.

A) more

B) less

C) Can Not Say

D) None of the above

Correct Answer : less

119 .

In welding copper alloys with TIG arc welding

A) alternating current is used

B) direct current with reversed polarity is used

C) direct current with straight polarity is used

D) All of the above

Correct Answer : direct current with straight polarity is used

Explanation : Direct current with straight polarity (DCEN) is used when TIG welding copper alloys, the electrode is positive and the workpiece is negative. This polarity is preferred when welding copper alloys because it creates a stable arc with a deep and concentrated heat at the point of contact between the electrode and the workpiece, which helps to achieve a consistent weld.

120 .

A saw which cuts wood during the return stroke of the saw is known as

A) push saw

B) pull saw or draw saw

C) Can Not Say

D) None of the above

Correct Answer : push saw

121 .

The algebraic difference between the minimum limit and the basic size is called

A) upper deviation

B) actual deviation

C) lower deviation

D) fundamental deviation

Correct Answer : lower deviation

Explanation : In the context of geometric dimensioning and tolerancing (GD&T), the lower deviation of a hole is defined as the difference between the minimum limit of the hole size and its actual size.

It means the algebraic difference between the minimum limit and the basic size is called Lower deviation.

It's important to note that these terms are used in the context of geometric dimensioning and tolerancing (GD&T) and should be used in conjunction with the other GD&T symbols and concepts to ensure that parts are manufactured and assembled to the desired specifications.

122 .

Which of the following methods can be used for manufacturing 2 metre long seamless metallic tubes?

A) Rolling

B) Drawing

C) Extrusion

D) Extrusion and rolling

Correct Answer : Extrusion and rolling

123 .

The centrifugal casting method, is used for casting articles of

A) irregular shape

B) symmetrical shape about horizontal axis

C) non-ferrous metal only

D) symmetrical shape about vertical axis

Correct Answer : symmetrical shape about horizontal axis

124 .

The property of sand due to which it evolves a great amount of steam and other gases is called

A) permeability

B) cohesiveness

C) collapsibility

D) adhesiveness

Correct Answer : permeability

125 .

The cold chisels are made by

A) rolling

B) forging

C) piercing

D) drawing

Correct Answer : forging

126 .

The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as

A) extrusion

B) hot piercing

C) cold peening

D) cold heading

Correct Answer : cold peening

127 .

The metal extrusion process is generally used for producing

A) uniform solid sections

B) uniform hollow sections

C) varying solid and hollow sections

D) uniform solid and hollow sections

Correct Answer : uniform solid and hollow sections

128 .

The process of increasing the cross-section of a bar at the expense of its length, is called

A) spinning

B) peening

C) upsetting

D) drawing down

Correct Answer : upsetting

129 .

In a gas welding of mild steel using an oxy-acetylene flame, the total amount of acetylene consumed is 10 litre. The oxygen consumption from the cylinder is

A) 10 litre

B) 15 litre

C) 20 litre

D) 25 litre

Correct Answer : 10 litre

130 .

The sand used for making cores is

A) oil sand

B) dry sand

C) loam sand

D) green sand

Correct Answer : oil sand

131 .

Sand wash is a casting defect which

A) results in general enlargement of the casting

B) occurs near the ingates as rough lumps on the surface of a casting

C) occurs as sand patches on the upper surface of a casting

D) results in a mismatching of the top and bottom parts of a casting

Correct Answer : occurs near the ingates as rough lumps on the surface of a casting

132 .

Cold working distorts grain structure and does not provide an appreciable reduction in size.

A) Correct

B) Incorrect

C) Can Not Say

D) None of the above

Correct Answer : Correct

133 .

A pouring basin acts as a reservoir for the molten metal.

A) Agree

B) Disagree

C) Can Not Say

D) None of the above

Correct Answer : Agree

134 .

Notching is the operation of

A) bending a sheet of metal along a curved axis

B) cutting a sheet of metal in a straight line along the length

C) removal of metal to the desired shape from the edge of a plate

D) cutting a sheet of metal through part of its length and then bending the cut portion

Correct Answer : removal of metal to the desired shape from the edge of a plate

135 .

The cold working of metals is carried out

A) at any temperature

B) at the recrystallisation temperature

C) above the recrystallisation temperature

D) below the recrystallisation temperature

Correct Answer : below the recrystallisation temperature

136 .

Lancing is the operation of

A) bending a sheet of metal along a curved axis

B) cutting a sheet of metal through part of its length and then bending the cut portion

C) cutting a sheet of metal in a straight line along the length

D) removal of metal to the desired shape from the edge of a plate

Correct Answer : cutting a sheet of metal through part of its length and then bending the cut portion

137 .

The surface to be machined is marked on the pattern by

A) black colour

B) red colour

C) blue colour

D) yellow colour

Correct Answer : red colour

138 .

A progressive limit gauge has

A) 'Go' and 'Not go' member on the same side of the gauge

B) separate 'Go' and 'Not go' members

C) 'Go' member at one end and 'Not go' member at the other end

D) None of the above

Correct Answer : 'Go' and 'Not go' member on the same side of the gauge

139 .

In electric resistance welding, pressure applied varies from

A) 1 to 5 MPa

B) 5 to 10 MPa

C) 10 to 25 MPa

D) 25 to 55 MPa

Correct Answer : 25 to 55 MPa

140 .

In order to deliver molten metal from pouring basin to gate, a __________ is used.

A) core

B) riser

C) sprue

D) None of the above

Correct Answer : sprue

141 .

The process extensively used for making bolts and nuts is

A) extrusion

B) hot piercing

C) cold heading

D) cold peening

Correct Answer : cold heading

142 .

A sand employed on the faces of the pattern before moulding, is called

A) dry sand

B) parting sand

C) loam sand

D) green sand

Correct Answer : parting sand

143 .

Spot welding is used for welding

A) lap joints in plates having 0.025 mm to 1.25 mm thickness

B) lap joints in plates having thickness above 3 mm

C) butt joints in plates having thickness above 3 mm

D) butt joints in plates having 0.025 mm to 1.25 mm thickness

Correct Answer : lap joints in plates having 0.025 mm to 1.25 mm thickness

144 .

The directional solidification in casting can be improved by using

A) chills and chaplets

B) chills and padding

C) chaplets and padding

D) chills, chaplets and padding

Correct Answer : chills and padding

145 .

When two metal pieces of different thicknesses are to be welded by projection welding, then the projections should be made on __________ metal piece.

A) thicker

B) thinner

C) Can Not Say

D) None of the above

Correct Answer : thicker

146 .

In fore-hand welding, the angle between the welding rod and the work is kept as

A) 60°-70°

B) 50°-60°

C) 40°-50°

D) 30°-40°

Correct Answer : 30°-40°

147 .

The binder commonly used in making oil sand, is

A) clay-type binder

B) inorganic-type binder

C) organic-type binder

D) Any one of the above

Correct Answer : organic-type binder

148 .

The minimum size of a bloom is

A) 5 cm x 5 cm

B) 10 cm x 10 cm

C) 15 cm x 15 cm

D) 20 cm x 20 cm

Correct Answer : 15 cm x 15 cm

149 .

Metal patterns are used for

A) small castings

B) large castings

C) complicated castings

D) large scale production of castings

Correct Answer : large scale production of castings

150 .

In average work, the tolerance produced by investment casting method is

A) +1 mm

B) ±0.05 mm

C) +0.2 mm

D) +05 mm

Correct Answer : ±0.05 mm

151 .

The instrument which has all the features of try-square, bevel protractor, rule and scriber, is

A) combination set

B) inside micrometer

C) outside micrometer

D) depth gauge micrometer

Correct Answer : combination set

152 .

When a hole or cavity to be cored is not in line with the parting surface, then a __________ is used.

A) drop core

B) vertical core

C) horizontal core

D) balanced core

Correct Answer : drop core

153 .

In back-hand welding, the angle between the welding torch and the work is kept as

A) 60°-70°

B) 50°-60°

C) 40°-50°

D) 30°-40°

Correct Answer : 40°-50°

154 .

The cross-section of a chisel is usually

A) square

B) hexagonal

C) rectangular

D) octagonal

Correct Answer : octagonal

155 .

The blank diameter used in thread rolling will be

A) equal to pitch diameter of the thread

B) equal to minor diameter of the thread

C) a little larger than the pitch diameter of the thread

D) a little larger than the minor diameter of the thread

Correct Answer : a little larger than the minor diameter of the thread

156 .

Cast iron and steel pipes are produced by

A) die casting

B) true centrifugal casting

C) slush casting

D) investment casting

Correct Answer : true centrifugal casting

157 .

The temperature produced by oxy-hydrogen flame is about

A) 1800° C

B) 2100° C

C) 2400° C

D) 3200° C

Correct Answer : 2400° C

158 .

In order to ram the sand harder at the back of the mould and softer on the pattern face, a __________ is used.

A) squeezing machine

B) jolt machine

C) sand slinger

D) stripper plate machine

Correct Answer : squeezing machine

159 .

The property of sand due to which the sand grains stick together, is called

A) cohesiveness

B) permeability

C) adhesiveness

D) collapsibility

Correct Answer : cohesiveness

160 .

The acetylene cylinder is usually painted with

A) white colour

B) black colour

C) yellow colour

D) maroon colour

Correct Answer : maroon colour

161 .

A hacksaw blade is specified by its

A) width

B) length

C) material

D) number of teeth

Correct Answer : length

162 .

The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is

A) less than 0.1 percent

B) less than 0.3 percent

C) more than 0.3 percent

D) any where between 0.1 to 1 percent

Correct Answer : more than 0.3 percent

163 .

Which of the following statement is wrong?

A) The hot chamber die casting machine is used for casting zinc, tin, lead and other low melting alloys.

A)

B) The castings produced by centrifugal casting method have open and coarse grained structure.

B)

C) The cold chamber die casting machine is used for casting aluminium, magnesium, copper base alloys and other high melting alloys.

C)

D) All of the above

D)

Correct Answer : The castings produced by centrifugal casting method have open and coarse grained structure.

164 .

According to Indian standard specifications, 100 H6/g 5 means that.

A) basic size is 100 mm

B) actual size is 100 mm

C) difference between the actual size and basic size is 100 mm

D) None of the above

Correct Answer : basic size is 100 mm

165 .

The shrinkage allowance for cast iron pattern is

A) 10 mm/m

B) 16 mm/m

C) 20 mm/m

D) 26 mm/m

Correct Answer : 10 mm/m

166 .

For welding plates of thickness less than 5 mm, its edges

A) should be bevelled to a single-V or U-groove

B) do not require bevelling

C) should have a double-V or U-groove on one side

D) should have a double-V or U-groove on both sides

Correct Answer : do not require bevelling

167 .

An oxidising process used for aluminium and magnesium articles is called

A) parkerising

B) galvanising

C) sheradising

D) anodising

Correct Answer : anodising

168 .

A neutral flame is obtained by supplying

A) more volume of oxygen and less volume of acetylene

B) more volume of acetylene and less volume of oxygen

C) equal volumes of oxygen and acetylene

D) None of the above

Correct Answer : equal volumes of oxygen and acetylene

169 .

Tandem drawing of wires and tubes is necessary because

A) annealing is needed between stages

B) it is not possible to reduce at one stage

C) accuracy in dimensions is not possible otherwise

D) surface finish improves after every drawing stage

Correct Answer : annealing is needed between stages

170 .

The operation of straightening a curved sheet metal, is known as

A) drawing

B) coining

C) planishing

D) squeezing

Correct Answer : planishing

171 .

In order to cut mild steel, the cutting angle of chisel should be

A) 30°

B) 45°

C) 50°

D) 60°

Correct Answer : 60°

172 .

Piercing is an operation of cutting

A) a flat sheet to the desired shape

B) a hole (other than cylindrical) in a sheet of metal by the punch and the die

C) a cylindrical hole in a sheet of metal by the punch and the die

D) a number of holes evenly spaced in a regular pattern on a sheet of metal

Correct Answer : a hole (other than cylindrical) in a sheet of metal by the punch and the die

173 .

A diamond pointed chisel is used for cutting

A) keyways

B) grooves

C) flat surfaces

D) V-shaped grooves

Correct Answer : V-shaped grooves

174 .

Shift is a casting defect which

A) results in a mismatching of the top and bottom parts of a casting

B) results in general enlargement of a casting

C) occurs as sand patches on the upper surface of a casting

D) occurs near the ingates as rough lumps on the surface of a casting

Correct Answer : results in a mismatching of the top and bottom parts of a casting

175 .

During drawing operation, the states of stress in cup would include

A) tensile stress in the wall

B) compressive stress in the flange

C) Both (A) and (B)

D) None of the above

Correct Answer : Both (A) and (B)

176 .

The parts of circular cross-section which are symmetrical about the axis of rotation are made by

A) hot forging

B) hot spinning

C) hot drawing

D) hot extrusion

Correct Answer : hot spinning

177 .

Acetylene gas is stored in cylinders in

A) solid form

B) liquid form

C) gaseous form

D) Any one of the above

Correct Answer : liquid form

178 .

The operation of cutting a sheet of metal in a straight line along the length, is known as

A) slitting

B) forming

C) plunging

D) notching

Correct Answer : slitting

179 .

The consumable electrode is used in

A) TIG arc welding

B) carbon arc welding

C) submerged arc welding

D) MIG arc welding

Correct Answer : MIG arc welding

180 .

Which one of the following material will require the largest size of riser for the same size of casting?

A) Steel

B) Copper

C) Cast iron

D) Aluminium

Correct Answer : Steel

181 .

The material which can be best cut with oxygen cutting process is

A) brass

B) copper

C) mild steel

D) aluminium

Correct Answer : mild steel

182 .

The width of slot cut by a hacksaw blade is __________ the width of the blade.

A) equal to

B) greater than

C) less than

D) None of the above

Correct Answer : greater than

183 .

Thermit, used in thermit welding, is a mixture of

A) charcoal and iron oxide

B) charcoal and aluminium

C) iron oxide and aluminium

D) charcoal, iron oxide and aluminium

Correct Answer : iron oxide and aluminium

184 .

In fore-hand welding, the weld is made

A) from right to left

B) from left to right

C) either from left to right or from right to left

D) first from left to right and then from right to left

Correct Answer : from right to left

185 .

The machining allowance provided on patterns depends upon

A) type of casting metal

B) method of casting used

C) size and shape of casting

D) All of the above

Correct Answer : All of the above

186 .

In shielded arc welding

A) large electrode is used

B) welding rod coated with slag is used

C) welding rod coated with fluxing material is used

D) None of the above

Correct Answer : welding rod coated with fluxing material is used

187 .

In submerged arc welding, an arc is produced between a

A) metal electrode and the work

B) bare metal electrode and the work

C) carbon electrode and the work

D) two tungsten electrodes and the work

Correct Answer : bare metal electrode and the work

188 .

The electrodes used in spot welding have a tip of

A) copper

B) brass

C) aluminium

D) stainless steel

Correct Answer : copper

189 .

The tolerance produced by shell moulding process of casting is

A) ±1 mm

B) ±0.2 mm

C) +0.5 mm

D) +0.05 mm

Correct Answer : ±0.2 mm

190 .

A pattern maker's shrinkage rule considers

A) all pattern allowances

B) all materials to be cast

C) all materials of the pattern

D) only shrinkage allowance

Correct Answer : only shrinkage allowance

191 .

Blanking and piercing operations can be performed simultaneously in a

A) simple die

B) progressive die

C) compound die

D) combination die

Correct Answer : compound die

192 .

In blanking operation, the clearance is provided on

A) die

B) half on the punch and half on the die

C) punch

D) either on punch or die depending upon designer's choice

Correct Answer : punch

193 .

In piercing operation, the clearance is provided on

A) die

B) punch

C) half on the punch and half on the die

D) either on punch or die depending upon designer's choice

Correct Answer : die

194 .

When the file is moved to and fro over the work, it is known as

A) cross filing

B) draw filing

C) pull and push filing

D) None of the above

Correct Answer : draw filing

195 .

For arc welding

A) direct current is used

B) alternating current with low frequency is used

C) alternating current with high frequency is used

D) Any one of the above

Correct Answer : direct current is used

196 .

If an aluminium pattern made from a wooden master pattern is to be used for grey iron castings, then the shrinkage allowance allowed on the wooden pattern should be

A) 10 mm/m

B) 16 mm/m

C) 20 mm/m

D) 26 mm/m

Correct Answer : 26 mm/m

197 .

The hot working of metals is carried out

A) at any temperature

B) at the recrystallisation temperature

C) above the recrystallisation temperature

D) below the recrystallisation temperature

Correct Answer : above the recrystallisation temperature

198 .

When the molten metal is fed in the cavity of a metallic mould by gravity, the method of casting is known as

A) die casting method

B) slush casting method

C) centrifugal casting method

D) permanent mould casting method

Correct Answer : permanent mould casting method

199 .

In a four high rolling mill, the diameter of backing up rolls is __________ the diameter of working rolls.

A) equal to

B) larger than

C) smaller than

D) None of the above

Correct Answer : larger than

200 .

The welding process used to join the ends of two pipes of uniform cross-section, is

A) upset butt welding

B) spot welding

C) seam welding

D) projection welding

Correct Answer : upset butt welding

201 .

The operation of bending a sheet of metal along a curved axis, is known as

A) slitting

B) forming

C) notching

D) plunging

Correct Answer : forming

202 .

In a __________ , two or more operations are performed simultaneously at the single stroke of the ram.

A) simple die

B) compound die

C) progressive die

D) combination die

Correct Answer : progressive die

203 .

A rip saw

A) is a two man saw

B) has a narrow blade with two wooden handles

C) is used for cutting along the grains of wood

D) All of the above

Correct Answer : is used for cutting along the grains of wood

204 .

For welding plates of thickness more than 12.5 mm, its edges

A) do not require bevelling

B) should be bevelled to a single-V or U-groove

C) should have a double-V or U-groove on one side

D) should have a double-V or U-groove on both sides

Correct Answer : should have a double-V or U-groove on both sides

205 .

In electric resistance welding, voltage required for heating is

A) 6 to 10 volts

B) 11 to 20 volts

C) 50 to 100 volts

D) 100 to 240 volts

Correct Answer : 6 to 10 volts

206 .

The cutting edge of a chisel should be

A) hardened

B) hardened and tempered

C) tempered

D) case hardened

Correct Answer : hardened and tempered

207 .

Most of the oxy-acetylene welding is done with

A) oxidising flame

B) neutral flame

C) carburising flame

D) All of the above

Correct Answer : neutral flame

208 .

In order to check the clearance between two mating surfaces, a __________ gauge should be used.

A) ring

B) plug

C) feeler

D) None of the above

Correct Answer : feeler

209 .

The current in electric resistance welding can be regulated by

A) changing the primary turns of the transformer

B) varying the input supply

C) changing the secondary turns of the transformer

D) None of the above

Correct Answer : changing the primary turns of the transformer

210 .

A mortise gauge is a

A) boring tool

B) striking tool

C) planing tool

D) marking tool

Correct Answer : marking tool

211 .

In a cold chamber die casting machine, only non-ferrous alloys with __________ are casted.

A) low melting temperature

B) high melting temperature

C) Can Not Say

D) None of the above

Correct Answer : high melting temperature

212 .

Cold working of metal increases

A) hardness

B) yield strength

C) tensile strength

D) All of the above

Correct Answer : All of the above

213 .

Linde welding uses

A) neutral flame and right-ward technique

B) oxidising flame and left-ward technique

C) carburising flame and right-ward technique

D) neutral flame and left-ward technique

Correct Answer : carburising flame and right-ward technique

214 .

The purpose of a gate is to

A) deliver molten metal into the mould cavity

B) act as a reservoir for the molten metal

C) deliver molten metal from pouring basin to gate

D) feed the molten metal to the casting in order to compensate for the shrinkage

Correct Answer : deliver molten metal into the mould cavity

215 .

Galvanising is a

A) zinc diffusion process

B) process of coating zinc by hot dipping

C) process used for making thin phosphate coating on steel

D) None of the above

Correct Answer : process of coating zinc by hot dipping

216 .

In a four high rolling mill, there are four rolls out of which

A) two are working rolls and two are backing up rolls

B) three are working rolls and one is backing up roll

C) one is working roll and three are backing up rolls

D) All of the above

Correct Answer : two are working rolls and two are backing up rolls

217 .

In __________ welding, the weld may be made either from left to right or from right to left.

A) fore-hand

B) vertical

C) back-hand

D) None of the above

Correct Answer : vertical

Mechanical Engineering : Workshop Technology MCQs with Answers