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- Question
Which of the following statement is correct?
Options- A. The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency.
- B. The compression ratio for the compressor is always greater than unity.
- C. The compressor capacity is the ratio of workdone per cycle to the stroke volume.
- D. During isothermal compression of air, the workdone in a compressor is maximum.
- Correct Answer
- The compression ratio for the compressor is always greater than unity.
- 1. Which of the following statement is correct?
Options- A. In a compressible flow, the volume of the flowing liquid changes during the flow.
- B. A flow in which the volume of the flowing liquid does not change, is called incompressible flow.
- C. When the particles rotate about their own axes while flowing, the flow is said to be rotational flow.
- D. all of the above Discuss
- 2. Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?
Options- A. inlet valve closing after bottom dead centre
- B. inlet valve closing before bottom dead centre
- C. inlet valve opening before top dead centre
- D. exhaust valve closing after top dead centre Discuss
- 3. Which of the following statement is correct?
Options- A. Compression ratio for petrol engines varies from 6 to 10.
- B. Higher compression ratio in diesel engines results in higher pressures.
- C. Petrol engines work on Otto cycle.
- D. all of the above Discuss
- 4. Which of the following fuel detonates readily?
Options- A. Benzene
- B. Iso-octane
- C. Normal heptane
- D. Alcohol Discuss
- 5. Which of the following does not relate to a spark ignition engine?
Options- A. Ignition coil
- B. Spar kplug
- C. Carburettor
- D. Fuel injector Discuss
- 6. Which of the following fuel has little tendency towards detonation?
Options- A. Benzene
- B. Iso-octane
- C. Normal heptane
- D. Alcohol Discuss
- 7. Which one of the following is the effect of blade shape on performance of a centrifugal compressor?
Options- A. Backward curved blades has poor efficiency
- B. Backward curved blades lead to stable performance
- C. Forward curved blades has higher efficiency
- D. Forward curved blades produce lower pressure ratio Discuss
- 8. Which of the following statement is wrong?
Options- A. The reaction turbines are used for low head and high discharge.
- B. The angle of taper on draft tube is less than 8°.
- C. An impulse turbine is generally fitted slightly above the tail race.
- D. A Francis turbine is an impulse turbine. Discuss
- 9. A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?
Options- A. Pelton wheel with one nozzle
- B. Pelton wheel with two or more nozzles
- C. Kaplan turbine
- D. Francis turbine Discuss
- 10. Which of the following statement is correct?
Options- A. The centrifugal pump is suitable for large discharge and smaller heads.
- B. The centrifugal pump requires less floor area and simple foundation as compared to reciprocating pump.
- C. The efficiency of centrifugal pump is less as compared to reciprocating pump.
- D. all of the above Discuss
More questions
Correct Answer: all of the above
Correct Answer: inlet valve closing before bottom dead centre
Correct Answer: all of the above
Correct Answer: Normal heptane
Correct Answer: Fuel injector
Correct Answer: Iso-octane
Correct Answer: Forward curved blades produce lower pressure ratio
Correct Answer: A Francis turbine is an impulse turbine.
Correct Answer: Pelton wheel with one nozzle
Correct Answer: all of the above
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