Applied Thermodynamics (3161910) MCQs

MCQs of Part-I Reciprocating Compressors

Showing 61 to 66 out of 66 Questions
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61.

In multistage compressor, the isothermal compression is achieved by

(a)

employing inter-cooler
(b)

by constantly cooling the cylinder
(c)

by running the compressor at very slow speed
(d)

by insulating the cylinder
Answer:

Option (c)

62.

For minimum work in multistage compression, assuming same index of compression in all stages

(a)

work done in first stage should be more
(b)

work done in subsequent stages should increase
(c)

work done in subsequent stages should decrease
(d)

work done in all stages should be equal
Answer:

Option (d)

63.

Isothermal compression efficiency, even when running at high speed, can be approached by using

(a)

multistage compression
(b)

cold water spray
(c)

both (A) and (B) 
(d)

fully insulating the cylinder
Answer:

Option (c)

64.

During base load operation, the best method of controlling compressor is

(a)

start-stop motor
(b)

constant speed unloader
(c)

relief valve
(d)

variable speed
Answer:

Option (a)

65.

During peak load periods, the best method of controlling compressors is

(a)

start-stop motor
(b)

constant speed unloader
(c)

relief valve
(d)

variable speed
Answer:

Option (b)

66.

Which is false statement about air receivers?

(a)

These are used to dampen pulsations
(b)

These act as reservoir to take care of sudden demands
(c)

These increase compressor efficiency
(d)

These knock out some oil and moisture
Answer:

Option (c)

Showing 61 to 66 out of 66 Questions
4 5 6 7