Applied Thermodynamics (3161910) MCQs

MCQs of Part-I Reciprocating Compressors

Showing 11 to 20 out of 66 Questions
1 2 3 4 5 6
11.

The ratio of the discharge pressure to the inlet pressure of air is called

(a)

compression ratio
(b)

expansion ratio
(c)

compressor efficiency
(d)

volumetric efficiency
Answer:

Option (a)

12.

The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

(a)

compressor efficiency
(b)

volumetric efficiency
(c)

isothermal efficiency
(d)

mechanical efficiency
Answer:

Option (d)

13.

In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in __________ of the piston.

(a)

one stroke
(b)

two strokes
(c)

three strokes
(d)

four strokes
Answer:

Option (b)

14.

In a double-acting compressor, the air is compressed

(a)

in one cylinder
(b)

in two cylinders
(c)

in a single cylinder on both sides of the piston
(d)

in two cylinders on both sides of the piston
Answer:

Option (c)

15.

In a reciprocating compressor, work is done on the piston by air during

(a)

suction
(b)

compression
(c)

delivery
(d)

all of the mentioned
Answer:

Option (a)

16.

In a reciprocating compressor, work is done by the piston on air during

(a)

suction
(b)

compression
(c)

delivery
(d)

both B and C
Answer:

Option (d)

17.

The pressure of air at the beginning of the compression stroke is __________ the atmospheric pressure.

(a)

equal to
(b)

less than
(c)

more than
(d)

all of the mentioned
Answer:

Option (b)

18.

The temperature of the air at the beginning of the compression stroke is ________ the atmospheric temperature.

(a)

equal to
(b)

less than
(c)

more than
(d)

none of these
Answer:

Option (c)

19.

Clearance volume in actual reciprocating compressors is essential

(a)

to accommodate valves in the cylinder head
(b)

to provide cushioning effect
(c)

to attain high volumetric efficiency
(d)

to provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
Answer:

Option (d)

20.

In a reciprocating air compressor, the compression work per kg of air

(a)

increases as clearance volume increases
(b)

decreases as clearance volume increases
(c)

is independent of clearance volume
(d)

increases as clearance volume decreases
Answer:

Option (c)

Showing 11 to 20 out of 66 Questions
1 2 3 4 5 6