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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Carbon dioxide
Ammonia
Freon
Brine

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Refrigeration and Air Conditioning
The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

O.P)R
O.P)R - 1
O.P)P = (
(
O.P.)P = (
(
O.P)P = (
(
(
O.P.)R + 2
O.P.)R + 1
O.P.)P = (

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Refrigeration and Air Conditioning
A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called

Moist air
Saturated air
Specific humidity
Dry air

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Refrigeration and Air Conditioning
The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will

Remain unaffected
Increase
Decrease
May increase or decrease depending on the type of refrigerant used

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Refrigeration and Air Conditioning
The leaks in a refrigeration system using Freon are detected by

Smelling
Sulphur sticks which on detection gives white smoke
Using reagents
Halide torch which on detection produces greenish flame lighting

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Refrigeration and Air Conditioning
For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is

Rotating
Reciprocating
Screw
Centrifugal

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MORE MCQ ON Refrigeration and Air Conditioning

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