Mechanical Engineering

Question: If petrol is used in a diesel engine, then
[A].

low power will be produced

[B].

efficiency will be low

[C].

higher knocking will occur

[D].

black smoke will be produced

Answer: Option C

Explanation:

No answer description available for this question.

Question: Diesel as compared to petrol is
[A].

highly ignitable

[B].

more difficult to ignite

[C].

less difficult to ignite

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: In a four stroke cycle diesel engine, the exhaust valve
[A].

opens at 30° before bottom dead cnetre and closes at 10° after top dead centre

[B].

opens at 30° after bottom dead centre and closes at 10° before top dead centre

[C].

opens at bottom dead centre and closes at top dead centre

[D].

may open and close anywhere

Answer: Option A

Explanation:

No answer description available for this question.

Question: For the same maximum pressure and heat input, the exhaust temperature of petrol engine is __________ than that of diesel engine.
[A].

less

[B].

more

Answer: Option B

Explanation:

No answer description available for this question.

Question: In compression ignition engines, swirl denotes a
[A].

haphazard motion of the gases in the chamber

[B].

rotary motion of the gases in the chamber

[C].

radial motion of the gases in the chamber

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: A diesel engine has inlet valve, fuel injection valve and exhaust valve.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a four stroke cycle diesel engine, the compression
[A].

starts at 40° after bottom dead centre and ends at 10° before top dead centre

[B].

starts at 40° before top dead centre and ends at 40° after top dead centre

[C].

starts at top dead centre and ends at 40° before bottom dead centre

[D].

may start and end anywhere

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a four stroke cycle diesel engine, the inlet valve
[A].

opens at 20° before top dead centre and closes at 40° after bottom dead centre

[B].

opens at 20° after top dead centre and closes at 20° before bottom dead centre

[C].

opens at top dead centre and closes at bottom dead centre

[D].

may open and close anywhere

Answer: Option A

Explanation:

No answer description available for this question.

Question: A diesel engine has
[A].

one valve

[B].

two valves

[C].

three valves

[D].

four valves

Answer: Option C

Explanation:

No answer description available for this question.