Mechanical Engineering

Question: A turbo-prop is preferred to turbo-jet because
[A].

it has high propulsive efficiency at high speeds

[B].

it can fly at super sonic speeds

[C].

it can fly at high elevations

[D].

it has high power for take off

Answer: Option D

Explanation:

No answer description available for this question.

Question: In a jet propulsion
[A].

the propulsive matter is ejected from within the propelled body

[B].

the propulsive matter is caused to flow around the propelled body

[C].

its functioning does not depend upon presence of air

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: In the aircraft propellers
[A].

the propulsive matter is ejected from within the propelled body

[B].

the propulsive matter is caused to flow around the propelled body

[C].

its functioning does not depend upon the presence of air

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a jet engine, the air-fuel ratio is
[A].

30:1

[B].

40:1

[C].

50:1

[D].

60:1

Answer: Option D

Explanation:

No answer description available for this question.

Question: In a jet engine, the compression varies as the square of the speed.
[A].

Correct

[B].

Incorrect

Answer: Option A

Explanation:

No answer description available for this question.

Question: In jet propulsion power unit, the inlet duct of diverging shape is used for converting kinetic energy of air into pressure energy.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: A jet engine has
[A].

no propeller

[B].

propeller in front

[C].

propeller at back

[D].

propeller on the top

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following statement is correct as regard to centrifugal compressors?
[A].

The flow of air is parallel to the axis of the compressor.

[B].

The static pressure of air in the impeller increases in order to provide centripetal force on the air.

[C].

The impeller rotates at high speeds.

[D].

The maximum efficiency is higher than multi-stage axial flow compressors.

Answer: Option B

Explanation:

No answer description available for this question.

Question: A compressor mostly used for supercharging of I.C. engines is
[A].

radial flow compressor

[B].

axial flow compressor

[C].

roots blower

[D].

reciprocating compressor

Answer: Option A

Explanation:

No answer description available for this question.

Question: An axial compressor gives optimum performance at high speeds and large volume flows.
[A].

Agree

[B].

Disagree

Answer: Option A

Explanation:

No answer description available for this question.