Discussion
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- Question
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
- Correct Answer
- inlet valve closing before bottom dead centre
- 1. In a petrol engine, the mixture has the lowest pressure at the
Options- A. beginning of suction stroke
- B. end of suction stroke
- C. end of compression stroke
- D. none of these Discuss
- 2. The mean effective pressure of a diesel engine having fixed compression ratio will __________ if cut off ratio decreases.
Options- A. increase
- B. decrease Discuss
- 3. In a two stroke engine, the working cycle is completed in two revolutions of the crankshaft.
Options- A. Correct
- B. Incorrect Discuss
- 4. The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to
Options- A. inject fuel in a chamber of high pressure at the end of compression stroke
- B. inject fuel at a high velocity to facilitate atomisation
- C. ensure that penetration is not high
- D. all of the above Discuss
- 5. A higher compression ratio causes
Options- A. pre-ignition
- B. increase in detonation
- C. an acceleration in the rate of combustion
- D. any one of these Discuss
- 6. The indicated mean effective pressure of an engine is obtained from the indicator diagram drawn with the help of an engine indicator.
Options- A. True
- B. False Discuss
- 7. The correct sequence of the decreasing order of brake thermal efficiency of the three given basic types of engines is
Options- A. four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
- B. four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
- C. four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
- D. two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine Discuss
- 8. A fuel will detonate less if it has higher self ignition temperature.
Options- A. True
- B. False Discuss
- 9. In order to eliminate knocking in compression ignition engines, there should be
Options- A. short delay period
- B. late auto-ignition
- C. low compression ratio
- D. high self ignition temperature of fuel Discuss
- 10. The size of a reactor at which the chain reaction can be initiated (i.e. when system becomes critical) with just enough fissionable material (called critical mass of fuel) is known as critical size of reactor.
Options- A. Correct
- B. Incorrect Discuss
IC Engines and Nuclear Power Plants problems
Search Results
Correct Answer: end of suction stroke
Correct Answer: decrease
Correct Answer: Incorrect
Correct Answer: all of the above
Correct Answer: any one of these
Correct Answer: True
Correct Answer: four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
Correct Answer: True
Correct Answer: short delay period
Correct Answer: Correct
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