MCQs of Part-I Reciprocating Compressors (Applied Thermodynamics - 3161910)

Showing 41 to 50 out of 66 Questions

41.

The work done on a compressor will be minimum if the air is taken from

(a)	the atmosphere
(b)	a source at 0°C
(c)	a source of low-temperature air
(d)	a source of high-temperature air

42.

The volumetric efficiency for reciprocating air compressors is about

43.

The total heat rejected in a reciprocating air compressor is equal to

(a)	the sum of the heat rejected during polytropic compression per kg of air and heat rejected in the intercooler per kg of air
(b)	the difference between the heat rejected during polytropic compression per kg of air and heat rejected in the intercooler per kg of air
(c)	the product of the heat rejected during polytropic compression per kg of air and heat rejected in the intercooler per kg of air
(d)	none of the mentioned

44.

Which of the following statement is wrong?

(a)	In a two stage reciprocating air compressor with complete intercooling, maximum work is saved.
(b)	The minimum work required for a two-stage reciprocating air compressor is double the work required for each stage.
(c)	The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency.
(d)	None of the above

45.

Intercooling in multi-stage compressors is done

(a)	to cool the air during compression
(b)	to cool the air at delivery
(c)	to enable compression in two stages
(d)	to minimise the work of compression

46.

In multistage compressor, the isothermal compression is achieved by

(a)	employing inter-cooler
(b)	by constantly cooling the cylinder
(c)	by running compressor at very slow speed
(d)	by insulating the cylinder

47.

Intercooling in compressors

(a)	cools the delivered air
(b)	results in saving of power in compressing a given volume to given pressure
(c)	is the standard practice for big compressors
(d)	enables compression in two stages

48.

The assumption made in two-stage compression with an intercooler is that

(a)	there is no pressure drop in the intercooler
(b)	the compression in both the cylinders is polytropic
(c)	the suction and delivery of air takes place at constant pressure
(d)	all of the above

49.

Pick up the wrong statement about advantages of multistage compression.

(a)	Better lubrication is possible advantages of multistage
(b)	More loss of air due to leakage past the cylinder
(c)	Mechanical balance is better
(d)	Air can be cooled perfectly in between

50.

Which is false statement about advantages of multistage compressor in comparison to single stage compressor?

(a)	Less power requirement
(b)	Better mechanical balance
(c)	Less loss of air due to leakage past the cylinder
(d)	Lower volumetric efficiency

Showing 41 to 50 out of 66 Questions