Mechanical Engineering

Question: The brake power is the power available
[A].

in the engine cylinder

[B].

at the crank shaft

[C].

at the crank pin

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: If the speed of the engine is increased, the indicated power will
[A].

increase

[B].

decrease

[C].

remain same

Answer: Option A

Explanation:

No answer description available for this question.

Question: Number of working strokes per min. for a four stroke cycle engine are __________ the speed of the engine in r.p.m.
[A].

equal to

[B].

one-half

[C].

twice

[D].

four-times

Answer: Option B

Explanation:

No answer description available for this question.

Question: Number of working strokes per min. for a two stroke cycle engine are __________ the speed of the engine in r.p.m.
[A].

equal to

[B].

one-half

[C].

twice

[D].

four-times

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following statement is correct regarding normal cetaine?
[A].

It is a standard fuel used for knock rating of diesel engines.

[B].

Its chemical name is normal-hexadecane.

[C].

It has long carbon chain structure.

[D].

all ofthe above

Answer: Option D

Explanation:

No answer description available for this question.

Question: Detonation is harmful due to
[A].

increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine

[B].

excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls

[C].

high intensity of knock causes crankshaft vibration and the engine runs rough

[D].

none of the above

Answer: Option D

Explanation:

No answer description available for this question.

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.