Oil Hydraulics and Pneumatics (3151913) MCQs

MCQs of Air Preparation and Service Unit

Showing 21 to 30 out of 48 Questions
1 2 3 4 5
21.

The centrifugal and axial flow compressor are the types of

(a)

displacement compressor
(b)

steady-flow compressor
(c)

both of the mentioned
(d)

none of the mentioned
Answer:

Option (b)

22.

Which of the following is true for a centrifugal compressor?

(a)

rotation of the impeller compresses the air
(b)

diffuser converts part of KE into internal energy
(c)

typical pressure ratio is around 1.4 to 1
(d)

all of the mentioned
Answer:

Option (d)

23.

Which of the following is true for an axial-flow compressor?

(a)

blades are arranged in the same manner as in reaction turbine
(b)

the flow of air is along the axis of the compressor
(c)

the velocity of air changes when it passes through the blades
(d)

all of the mentioned
Answer:

Option (d)

24.

For the uncooled rotary compressor, the compression process is _______ while the ideal process is ________.

(a)

adiabatic, isentropic
(b)

isothermal, adiabatic
(c)

isentropic, adiabatic
(d)

adiabatic, isothermal
Answer:

Option (a)

25.

Flow in a centrifugal compressor is inversely proportional to _______.

(a)

time
(b)

square of time
(c)

cube of time
(d)

none of the mentioned
Answer:

Option (a)

26.

Head in centrifugal compressor is __________ to square of the time.

(a)

directly proportional
(b)

equal to
(c)

inversely proportional
(d)

none of the mentioned
Answer:

Option (c)

27.

In centrifugal compressor flow is ____________

(a)

radial
(b)

axial
(c)

both of the mentioned 
(d)

none of the mentioned 
Answer:

Option (a)

28.

In centrifugal compressor energy present in the gas is utilized for ___________

(a)

compression 
(b)

increase temperature
(c)

increase pressure
(d)

none of the mentioned
Answer:

Option (a)

29.

Centrifugal compressors deliver _____ flow capacity per unit of installed space and weight.

(a)

high 
(b)

low
(c)

constant
(d)

medium
Answer:

Option (a)

30.

Which of the following is/are rotary type compressor?

(a)

Twin-screw
(b)

Rotary vane
(c)

Lobe type
(d)

All of the mentioned 
Answer:

Option (d)

Showing 21 to 30 out of 48 Questions
1 2 3 4 5