Discussion
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- Question
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
- Correct Answer
- all of the above
- 1. 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
- 2. The mechanical efficiency (?m) of the engine is given by
Options- A.
- B.
- C.
- D. none of these Discuss
- 3. The running cost of a petrol engine is __________ than that of a diesel engine.
Options- A. higher
- B. lower Discuss
- 4. Which of the following statement is wrong?
Options- A. In compression ignition engines, detonation occurs near the beginning of combustion.
- B. Since the fuel, in compression ignition engines, is injected at the end of compression stroke, therefore, there will be no pre-ignition.
- C. To eliminate knock in compression ignition engines, we want to achieve auto-ignition not early and desire a long delay period.
- D. In compression ignition engines, because of hetrogeneous mixture, the rate of pressure rise is comparatively lower. Discuss
- 5. Supercharging __________ the power developed by the engine.
Options- A. has no effect on
- B. increases
- C. decreases Discuss
- 6. In a two stroke engine, the working cycle is completed in two revolutions of the crankshaft.
Options- A. Correct
- B. Incorrect Discuss
- 7. The mean effective pressure of a diesel engine having fixed compression ratio will __________ if cut off ratio decreases.
Options- A. increase
- B. decrease Discuss
- 8. 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
- 9. 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
- 10. 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
IC Engines and Nuclear Power Plants problems
Search Results
Correct Answer: any one of these
Correct Answer:
Correct Answer: higher
Correct Answer: To eliminate knock in compression ignition engines, we want to achieve auto-ignition not early and desire a long delay period.
Correct Answer: increases
Correct Answer: Incorrect
Correct Answer: decrease
Correct Answer: end of suction stroke
Correct Answer: inlet valve closing before bottom dead centre
Correct Answer: True
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