Discussion
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- Question
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
- Correct Answer
- four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
- 1. 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
- 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. 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
- 4. The mean effective pressure of a diesel engine having fixed compression ratio will __________ if cut off ratio decreases.
Options- A. increase
- B. decrease Discuss
- 5. In a two stroke engine, the working cycle is completed in two revolutions of the crankshaft.
Options- A. Correct
- B. Incorrect Discuss
- 6. A fuel will detonate less if it has higher self ignition temperature.
Options- A. True
- B. False Discuss
- 7. 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
- 8. 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
- 9. 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
- 10. The two reference fuels used for cetane rating are
Options- A. cetane and iso-octane
- B. cetane and alpha-methyl naphthalene
- C. cetane and normal heptane
- D. cetane and tetra ethyl lead Discuss
IC Engines and Nuclear Power Plants problems
Search Results
Correct Answer: True
Correct Answer: inlet valve closing before bottom dead centre
Correct Answer: end of suction stroke
Correct Answer: decrease
Correct Answer: Incorrect
Correct Answer: True
Correct Answer: short delay period
Correct Answer: Correct
Correct Answer: all of the above
Correct Answer: cetane and alpha-methyl naphthalene
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