Applied Thermodynamics (3161910) MCQs

MCQs of Part-II Centrifugal Compressors

Showing 1 to 10 out of 24 Questions
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1.

Rotodynamic compressors are used for delivering

(a)

small quantities of air at high pressures
(b)

large quantities of air at high pressures
(c)

small quantities of air at low pressures
(d)

large quantities of air at low pressures
Answer:

Option (d)

2.

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)

3.

In a centrifugal compressor, the air enters the impeller _______  and leaves the vane _______.

(a)

axially, radially
(b)

radially,axially 
(c)

axially, axially
(d)

radially,radially 
Answer:

Option (a)

4.

In a centrifugal compressor, the flow of air is __________ to the axis of the compressor.

(a)

parallel
(b)

perpendicular
(c)

inclined
(d)

none of these
Answer:

Option (b)

5.

If the flow of air through the compressor is perpendicular to its axis, then it is a

(a)

reciprocating compressor
(b)

centrifugal compressor
(c)

axial flow compressor
(d)

turbo compressor
Answer:

Option (b)

6.

The stagnation pressure rise in a centrifugal compressor takes place

(a)

in the diffuser only
(b)

in the impeller only
(c)

in the diffuser and impeller
(d)

in the inlet guide vanes only
Answer:

Option (c)

7.

A centrifugal compressor works on the principle of

(a)

conversion of pressure energy into kinetic energy
(b)

centripetal action
(c)

conversion of kinetic energy into pressure energy
(d)

generating pressure directly
Answer:

Option (c)

8.

The function of _________ is to convert high kinetic energy of gases into pressure energy.

(a)

impeller
(b)

diffuser
(c)

casing
(d)

none of the above
Answer:

Option (b)

9.

How is the variation of air velocity while passing through impeller followed by diffuser in centrifugal compressor?

(a)

Air velocity goes no increasing in impeller followed by diffuser
(b)

Air velocity goes no decreasing in impeller followed by diffuser
(c)

Air velocity increases in impeller and then decreases in diffuser
(d)

Air velocity decreases in impeller and then increases in diffuser
Answer:

Option (c)

10.

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)

Showing 1 to 10 out of 24 Questions
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