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Question: The basic requirement of a good combustion chamber is
[A].

minimum turbulence

[B].

low compression ratio

[C].

high thermal efficiency and power output

[D].

low volumetric efficiency

Answer: Option C

Explanation:

No answer description available for this question.

Question: In open combustion chamber in diesel engines, the shape and layout of the piston crown, the inlet port and the valve produce the turbulent effect of fuel mixture.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: In petrol engines, the delay period is of the order of
[A].

0.001 second

[B].

0.002 second

[C].

0.003 second

[D].

0.004 second

Answer: Option B

Explanation:

No answer description available for this question.

Question: In order to eliminate knocking in compression ignition engines, there should be
[A].

short delay period

[B].

late auto-ignition

[C].

low compression ratio

[D].

high self ignition temperature of fuel

Answer: Option A

Explanation:

No answer description available for this question.

Question: A long delay period in compression ignition engines gives a more rapid rise in pressure which causes knocking.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

Question: Anti-knock for compression ignition engines is
[A].

napthene

[B].

tetra ethyl lead

[C].

amyl nitrate

[D].

hexadecane

Answer: Option C

Explanation:

No answer description available for this question.

Question: A fuel of cetane number 40 has the same ignition quality as a mixture of
[A].

40% cetane and 60% alpha methyl napthalene

[B].

40% alpha methyl napthalene and 60% cetane

[C].

40% petrol and 60% diesel

[D].

40% diesel and 60% petrol

Answer: Option A

Explanation:

No answer description available for this question.

Question: A mixture containing 65% of iso-octane and 35% of normal heptane will have
[A].

cetane number 65

[B].

octane number 65

[C].

qetane number 35

[D].

octane number 35

Answer: Option B

Explanation:

No answer description available for this question.

Question: In petrol engines, advancing of the spark timing will __________ the knocking tendency.
[A].

not effect

[B].

decrease

[C].

increase

Answer: Option C

Explanation:

No answer description available for this question.

Question: By higher octane number of spark ignition fuel, it is meant that the fuel has
[A].

higher heating value

[B].

higher flash point

[C].

lower volatility

[D].

longer ignition delay

Answer: Option D

Explanation:

No answer description available for this question.