Top 80+ Solved Turbo Machines MCQ Questions Answer
Q. In a gas turbine cycle regenerator is used to
a. heat fuel supplied to combustion chamber
b. heat air supplied to combustion chamber
c. heat the gases coming out of combustion chamber
d. heat exhaust gases released from low pressure turbine
Q. In a nozzle, once the critical conditions are achieved at the throat, than which of the following remains constant
a. Density of fluid
b. Velocity of fluid
c. Flow rate
d. All of the above
Q. In a hot wire anemometer the rate of heat loss from sensing element is a function of
a. pressure
b. mass rate of flow
c. velocity of flow
d. none of the above
Q. When working substance is released through nozzles, the direction of reaction will be
a. clockwise
b. counter clockwise
c. either of (A) and (B) above
d. direction depends on other design features
Q. Though there are no cyclic variations even then rotary compressors need precise balancing because
a. It is bulky in size
b. it is driven by an electric motor
c. cooling arrangement does not exist
d. operating speeds are too high
Q. In a velocity compounded steam turbine, as steam moves along moving and guide blades
a. both pressure and velocity gradually decrease
b. Both pressure and velocity gradually increase.
c. pressure gradually increases and velocity is low
d. pressure is low and velocity gradually decreases
Q. Generally, steam turbines in power stations operate at
a. 3000 rpm
b. 375 rpm
c. 1000 rpm
d. 1500 rpm
Q. An ideal fluid for vapour turbine cycle should have
a. low critical temperature with high pressure
b. high critical temperature with low pressure
c. high critical temperature with high pressure
d. low critical temperature with low presure
Q. Overall efficiency of a gas turbine is
a. less than Diesel cycle efficiency
b. more than Otto or Diesel cycle efficiency
c. equal to Rankine cycle efficiency
d. equal to Carnot cycle efficiency
Q. In gas turbines, intercooling results in
a. decrease in net output and increase in thermal efficiency
b. decrease in net output as well as thermal efficiency
c. increase in net output as well as thermal efficiency
d. increase in net output but decrease in thermal efficiency
Q. Maximum delivery pressure in case of rotary compressors is usually restricted to
a. 5 atmospheres
b. 10 atmospheres
c. 2 atmospheres
d. 20 atmospheres
Q. For efficient operation of axial flow compressors the blades are made
a. aerofoil section
b. forward curved
c. straight
d. slightly curved
Q. Under standard atmospheric condition, the velocity of air is
a. 236 m/s
b. 436 m/s
c. 336 m/s
d. 536 m/s
Q. A diffuser
a. converts thermal energy into kinetic energy
b. converts pressure energy into kinetic energy
c. converts kinetic energy into thermal energy
d. converts potential energy into kinetic energy