Mechanical Engineering

Question: In diesel engines, the ignition takes place due to the heat produced in the engine cylinder at the end of compression.
[A].

Correct

[B].

Incorrect

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a petrol engine, if diesel is used, then the engine will
[A].

not run

[B].

run more efficiently

[C].

run at high speed

[D].

explode

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a petrol engine, the mixture has the lowest pressure at the
[A].

beginning of suction stroke

[B].

end of suction stroke

[C].

end of compression stroke

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

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.