Mechanical Engineering

Question: Morse test can be conducted for
[A].

petrol engines

[B].

diesel engines

[C].

multi-cylinder engines

[D].

all of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Morse test is used to determine the I.P. of a
[A].

single cylinder petrol engine

[B].

four stroke engine

[C].

single cylinder diesel engine

[D].

multi-cylinder engine

Answer: Option D

Explanation:

No answer description available for this question.

Question: A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is
[A].

248 cm3

[B].

252 cm3

[C].

264 cm3

[D].

286 cm3

Answer: Option C

Explanation:

No answer description available for this question.

Question: If the compression ratio in I.C. engine increases, then its thermal efficiency will
[A].

decrease

[B].

increase

[C].

remain same

Answer: Option B

Explanation:

No answer description available for this question.

Question: The air standard efficiency of an I.C. engine depends on
[A].

fuel used

[B].

speed of engine

[C].

compression ratio

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: The air standard efficiency ofan I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)
[A].

1 – rγ – 1

[B].

1 + rγ – 1

[C].

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: As compared to air standard cycle, in actual working, the effect of variation in specific heats is to
[A].

increase maximum pressure and maximum temperature

[B].

reduce maximum pressure and maximum temperature

[C].

increase maximum pressure and decrease maximum temperature

[D].

decrease maximum pressure and increase maximum temperature

Answer: Option B

Explanation:

No answer description available for this question.

Question: The brake power of a diesel engine, keeping other parameters constant, can be increased by
[A].

decreasing the density of intake air

[B].

increasing the temperature of intake air

[C].

increasing the pressure of intake air

[D].

decreasing the pressure of intake air

Answer: Option C

Explanation:

No answer description available for this question.

Question: The brake power is always greater than indicated power.
[A].

Agree

[B].

Disagree

Answer: Option B

Explanation:

No answer description available for this question.

Question: The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in metres, N = Speed of engine in r.p.m., S – Spring balance reading in newtons, D = Dia. of brake drum in metres, and d = Dia. of rope in metres)
[A].

[B].

[C].

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.