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This set of Turbo Machines Multiple Choice Questions & Answers (MCQs) focuses on Turbo Machines Set 4
Q1 | Ljungstrom steam turbine is a
- radial flow turbine
- axial flow turbine
- mixed flow turbine
- any of the above
Q2 | A constant volume combustion gas turbine operates on
- Joule cycle
- Ericsson cycle
- Brayton cycle
- Atkinson cycle
Q3 | All of the following are positive displacement compressors EXCEPT
- Vane blower
- Roots blower
- Screw compressor
- Axial flow compressor
Q4 | De Laval turbine is used for applications requiring
- High power, low speed
- Low power, high speed
- High power, high speed
- Low power, low speed
Q5 | Which type of rotary compressor is used in oil fired furnaces?
- Sliding vane type blower
- Axial flow compressor
- Screw compressor
- Centrifugal blower
Q6 | In a two stage gas turbine plant, reheating after first stage
- increases work ratio
- decreases work ratio
- does not affect work ratio
- none of the above
Q7 | The efficiency of a simple open cycle gas turbine depends upon
- pressure ratio
- compressor efficiency
- turbine inlet temperature
- All of the above
Q8 | In a nozzle under choked flow conditions pressure waves travel, in the divergent portion, at
- subsonic to supersonic speed
- supersonic speed
- sonic speed
- subsonic speed
Q9 | Which of the following is a displacement compressors?
- Reciprocating air compressor
- Centrifugal blower
- Axial flow compressors
- Vane blower
Q10 | With ideal regencrative heat exchanger, the thermal efficiency of gas turbine cycle is
- equal to work ratio
- is less than work ratio
- is more than work ratio
- none of the above
Q11 | In a modern steam turbine, the steam rte is nearly
- 1 kg/kWhr
- 8 kg/kWhr
- 4 kg/kWhr
- 2 kg/kWhr
Q12 | In air compressor performance curve a surge line represents
- limits of compressor discharge
- limit of compressor efficiency
- lower critical speed of shaft
- limit of stable operation
Q13 | In rotary compressors, slip factor is the ratio of
- stagnation pressure to static pressure
- isentropic work done to actual work
- outlet whirl velocity to the blade velocity
- none of the above
Q14 | In a gas turbine combined cycle plant, a waste heat boiler is used to
- heat air from intercooler
- gases from regenerator
- recover heat form exhaust gases
- none of the above
Q15 | The flow on two sides of a normal shock wave is
- supersonic on one side and subsonic on the other side
- subsonic
- supersonic
- sonic
Q16 | Which of the following rotary compressor has two shafts?
- Sliding vane compressor
- Centrifugal compressor
- Lobe type compressor
- Axial flow compressor