Mechanical Engineering - IC Engines and Nuclear Power Plants

11. 

The brake power of a diesel engine, keeping other parameters constant, can be increased by

A. decreasing the density of intake air
B. increasing the temperature of intake air
C. increasing the pressure of intake air
D. decreasing the pressure of intake air

Answer: Option C

Explanation:

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12. 

In diesel engines, the fuel is injected in the form of very fine spray, into the engine cylinder, which gets ignited due to high temperature of the compressed air.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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13. 

Pre-ignition is caused by the spontantaneous combustion of the mixture before the end of the compression stroke, and is due to

A. cylinder walls being too hot
B. overheated spark plug points
C. red hot carbon deposits on cylinder walls
D. any one of these

Answer: Option D

Explanation:

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14. 

The expansion of fuel in a four stroke cycle diesel engine

A. starts at 15° before top dead centre and ends at 30° after top dead centre
B. starts at top dead centre and ends at 30° after top dead centre
C. starts at 15° after top dead centre and ends at 30° before bottom dead centre
D. may start and end anywhere

Answer: Option C

Explanation:

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15. 

The object of supercharging the engine is

A. to reduce mass ofthe engine per brake power
B. to reduce space occupied by the engine
C. to increase the power output of an engine when greater power is required
D. all ofthe above

Answer: Option D

Explanation:

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