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4

The specific humidity during dehumidification process

A. Remains constant

B. Increases

C. Decreases

D. None of these

Correct Answer :

C. Decreases


Related Questions

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4

Cooling water is required for following equipment in ammonia absorption plant

A. Condenser

B. Evaporator

C. Absorber

D. Condenser, absorber and separator (rectifier)

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4

One ton refrigeration corresponds to

A. 50 kcal/ min

B. 50 kcal/ hr

C. 80 kcal/ min

D. 80 kcal/ hr

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4

The dehumidification process, on the psychrometric chart, is shown by

A. Horizontal line

B. Vertical line

C. Inclined line

D. Curved line

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4

The material of pipe lines for a system using Freon as a refrigerant should be

A. Brass

B. Copper

C. Steel

D. Aluminium

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4

The specific humidity during humidification process

A. Remains constant

B. Increases

C. Decreases

D. None of these

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4

The higher temperature in vapour compression cycle occurs at

A. Receiver

B. Expansion valve

C. Evaporator

D. Compressor discharge

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4

The bank of tubes at the back of domestic refrigerator is

A. Condenser tubes

B. Evaporator tubes

C. Refrigerant cooling tubes

D. Capillary tubes

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4

The air cooling system mostly used in transport type aircrafts is

A. Simple air cooling system

B. Simple evaporative air cooling system

C. Bootstrap air cooling system

D. All of these

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4

Oil separator in a refrigeration cycle is installed

A. Before compressor

B. Between compressor and condenser

C. Between condenser and evaporator

D. Between condenser and expansion valve

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4

An important characteristic of absorption system of refrigeration is

A. Noisy operation

B. Quiet operation

C. Cooling below 0°C

D. Very little power consumption

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4

Which of the following cycles uses air as the refrigerant?

A. Ericson

B. Stirling

C. Carnot

D. Bell Coleman

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4

In a domestic vapour compression refrigerator, the refrigerant commonly used is

A. CO₂

B. Ammonia

C. R-12

D. All of these

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4

At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

A. Decreases

B. Increases

C. Remain same

D. Depends on other factors

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4

The condition of refrigerant as it leaves the compressor in a vapour compression system is

A. Saturated liquid

B. Wet vapour

C. Dry saturated vapour

D. Superheated vapour

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4

For unsaturated air, the dew point temperature is __________ wet bulb temperature.

A. Equal to

B. Less than

C. More than

D. None of these

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4

In S.J. unit, one ton of refrigeration is equal to

A. 210 kJ/ min

B. 21 kJ/ min

C. 420 kJ/ min

D. 840 kJ/ min

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4

The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as

A. Mean radiant temperature

B. Effective temperature

C. Dew point temperature

D. None of these

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4

Which of the following refrigerant has the highest freezing point.

A. Ammonia

B. Carbon dioxide

C. Sulphur dioxide

D. R-12

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4

Air refrigeration cycle is used in

A. Commercial refrigerators

B. Domestic refrigerators

C. Air-conditioning

D. Gas liquefaction

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4

The coefficient of performance of Electrolux refrigerator is the ratio of

A. Heat supplied by the gas burner to the heat absorbed by the evaporator

B. Heat absorbed by the evaporator to the heat supplied by the gas burner

C. Heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner

D. Heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator

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4

In case of sensible cooling of air, the coil efficiency is given by

A. B.P.F. - 1

B. 1 - B.P.F.

C. 1/ B.P.F.

D. 1 + B.P.F.

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4

The freezing point of sulphur dioxide is

A. -56.6°C

B. -75.2°C

C. -77.7°C

D. -135.8°C

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4

Air refrigeration cycle is used in

A. Domestic refrigerators

B. Commercial refrigerators

C. Air conditioning

D. Gas liquefaction

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4

In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is

A. High pressure saturated liquid

B. Wet vapour

C. Very wet vapour

D. Dry vapour

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4

Which of the following is not a desirable property of a refrigerant?

A. High risibility with oil

B. Low boiling point

C. Good electrical conductor

D. Large latent heat

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4

The alignment circle is marked on the psychrometric chart at

A. 20°C DBT and 50% RH

B. 26°C DBT and 50% RH

C. 20°C DBT and 60% RH

D. 26°C DBT and 60% RH

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4

The domestic refrigerator uses following type of compressor

A. Centrifugal

B. Axial

C. Miniature sealed unit

D. Piston type reciprocating

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4

The relative coefficient of performance is

A. Actual COP/theoretical COP

B. Theoretical COP/actual COP

C. Actual COP × theoretical COP

D. None of these

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4

The evaporator changes the low pressure liquid refrigerant from the expansion valve into

A. High pressure liquid refrigerant

B. Low pressure liquid and vapour refrigerant

C. Low pressure vapour refrigerant

D. None of these

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4

The wet bulb depression is zero when relative humidity is

A. Zero

B. 0.5

C. 0.75

D. 1.0