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Mechanical Engineering : Steam Nozzles and Turbines - Quiz(MCQ)
A)
stage efficiency
B)
internal efficiency
C)
Rankine efficiency
D)
None of the above

Correct Answer : Option (B) :   internal efficiency

A)
when the cross-section of the nozzle decreases continuously from entrance to exit
B)
when the cross-section of the nozzle increases continuously from entrance to exit
C)
when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
D)
None of the above

Correct Answer : Option (A) :   when the cross-section of the nozzle decreases continuously from entrance to exit

A)
60°
B)
90°
C)
180°
D)
270°

Correct Answer : Option (B) :   90°

A)
isothermal flow
B)
constant volume flow
C)
isentropic flow
D)
constant pressure flow

Correct Answer : Option (C) :   isentropic flow

A)
overdamping
B)
underdamping
C)
choked
D)
None of the above

Correct Answer : Option (C) :   choked

A)
area of nozzle at throat
B)
initial pressure and volume of steam
C)
final pressure ofsteam leaving the nozzle
D)
Both (A) and (B)

Correct Answer : Option (D) :   Both (A) and (B)

A)
heat energy of steam into kinetic energy
B)
kinetic energy into heat energy of steam
C)
potential energy into heat energy of steam
D)
heat energy of steam into potential energy

Correct Answer : Option (A) :   heat energy of steam into kinetic energy

A)
velocity increases
B)
velocity decreases
C)
velocity remains constant
D)
pressure remains constant

Correct Answer : Option (B) :   velocity decreases

A)
number of stages
B)
direction of steam flow
C)
mode of steam action
D)
All of the above

Correct Answer : Option (D) :   All of the above

10 .
The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as
A)
bleeding
B)
reheating of steam
C)
regenerative heating
D)
None of the above

Correct Answer : Option (A) :   bleeding