Top 80+ Solved Turbo Machines MCQ Questions Answer
Q. Ljungstrom steam turbine is a
a. radial flow turbine
b. axial flow turbine
c. mixed flow turbine
d. any of the above
Q. A constant volume combustion gas turbine operates on
a. Joule cycle
b. Ericsson cycle
c. Brayton cycle
d. Atkinson cycle
Q. All of the following are positive displacement compressors EXCEPT
a. Vane blower
b. Roots blower
c. Screw compressor
d. Axial flow compressor
Q. De Laval turbine is used for applications requiring
a. High power, low speed
b. Low power, high speed
c. High power, high speed
d. Low power, low speed
Q. Which type of rotary compressor is used in oil fired furnaces?
a. Sliding vane type blower
b. Axial flow compressor
c. Screw compressor
d. Centrifugal blower
Q. In a two stage gas turbine plant, reheating after first stage
a. increases work ratio
b. decreases work ratio
c. does not affect work ratio
d. none of the above
Q. The efficiency of a simple open cycle gas turbine depends upon
a. pressure ratio
b. compressor efficiency
c. turbine inlet temperature
d. All of the above
Q. In a nozzle under choked flow conditions pressure waves travel, in the divergent portion, at
a. subsonic to supersonic speed
b. supersonic speed
c. sonic speed
d. subsonic speed
Q. Which of the following is a displacement compressors?
a. Reciprocating air compressor
b. Centrifugal blower
c. Axial flow compressors
d. Vane blower
Q. With ideal regencrative heat exchanger, the thermal efficiency of gas turbine cycle is
a. equal to work ratio
b. is less than work ratio
c. is more than work ratio
d. none of the above
Q. In a modern steam turbine, the steam rte is nearly
a. 1 kg/kWhr
b. 8 kg/kWhr
c. 4 kg/kWhr
d. 2 kg/kWhr
Q. In air compressor performance curve a surge line represents
a. limits of compressor discharge
b. limit of compressor efficiency
c. lower critical speed of shaft
d. limit of stable operation
Q. In rotary compressors, slip factor is the ratio of
a. stagnation pressure to static pressure
b. isentropic work done to actual work
c. outlet whirl velocity to the blade velocity
d. none of the above
Q. In a gas turbine combined cycle plant, a waste heat boiler is used to
a. heat air from intercooler
b. gases from regenerator
c. recover heat form exhaust gases
d. none of the above
Q. The flow on two sides of a normal shock wave is
a. supersonic on one side and subsonic on the other side
b. subsonic
c. supersonic
d. sonic