Question: Which of the following statement is correct regarding petrol engines?
[A].

A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure.

[B].

The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug.

[C].

The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition.

[D].

all of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a four stroke cycle petrol engine, the charge is compressed when both the valves (i.e. inlet valve and exit valve) are closed,
[A].

Agree

[B].

Disagree

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a petrol engine, the fuel supplied to the engine cylinder is mixed with required quantity of air and the mixture is ignited with a
[A].

fuel pump

[B].

fuel injector

[C].

spark plug

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: During idling, a petrol engine requires __________ mixture.
[A].

lean

[B].

rich

[C].

chemically correct

Answer: Option B

Explanation:

No answer description available for this question.

Question: During suction stroke of a four stroke petrol engine, the inlet valve opens and the charge is sucked into the cylinder as the piston moves upwards from the bottom dead centre.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the
[A].

beginning of suction stroke

[B].

end of suction stroke

[C].

beginning of exhaust stroke

[D].

end of exhaust stroke

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a petrol engine, the charge is ignited with the help of a spark plug.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a four stroke cycle petrol engine, the expansion
[A].

starts at top dead centre and ends at bottom dead centre

[B].

starts at 30° before top dead centre and ends at 50° before bottom dead centre

[C].

starts at 30° after top dead centre and ends at 50° after bottom dead centre

[D].

may start and end anywhere

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a four stroke cycle petrol engine, the charge is ignited at
[A].

30° before top dead centre

[B].

30° after top dead centre

[C].

30° before bottom dead centre

[D].

30° after bottom dead centre

Answer: Option A

Explanation:

No answer description available for this question.

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

starts at 40° after bottom dead centre and ends at 30° before top dead centre

[B].

starts at 40° before bottom dead centre and ends at 30° after bottom dead centre

[C].

starts at bottom dead centre and ends at top dead centre

[D].

may start and end anywhere

Answer: Option A

Explanation:

No answer description available for this question.