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4

The vertical and uniformly spaced lines on a psychrometric chart indicates

A. Dry bulb temperature

B. Wet bulb temperature

C. Dew point temperature

D. Specific humidity

Correct Answer :

A. Dry bulb temperature


Related Questions

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4

A vapour absorption refrigeration system

A. Gives noisy operation

B. Gives quiet operation

C. Requires little power consumption

D. Cools below 0°C

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4

The C.O.P. of a heat pump working on a reversed Carnot cycle is

A. T₁/(T₂ - T₁)

B. (T₂ - T₁)/T₁

C. (T₁ - T₂)/T₁

D. T₂/(T₂ - T₁)

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4

The thermal diffusivity for gases is generally __________ those for liquids.

A. Equal to

B. Less than

C. Greater than

D. None of these

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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

Where does the lowest temperature occur in a vapour compression cycle?

A. Condenser

B. Evaporator

C. Compressor

D. Expansion valve

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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

In larger industrial and commercial reciprocating compression systems, refrigerant widely used is

A. Ammonia

B. Carbon dioxide

C. Sulphur dioxide

D. R-12

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4

In vapour compression cycle, the condition of refrigerant is saturated liquid

A. After passing through the condenser

B. Before passing through the condenser

C. After passing through the expansion throttle valve

D. Before entering the expansion valve

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4

In a refrigeration system, the expansion device is connected between the

A. Compressor and condenser

B. Condenser and receiver

C. Receiver and evaporator

D. Evaporator and compressor

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4

The formation of frost on cooling coils in a refrigerator

A. Increases heat transfer

B. Improves C.O.P. of the system

C. Increases power consumption

D. Reduces power consumption

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4

The fluids used in Electrolux refrigerator are

A. Water and hydrogen

B. Ammonia and hydrogen

C. Ammonia, water and hydrogen

D. None of these

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4

The capillary tube, as an expansion device, is used in

A. Domestic refrigerators

B. Water coolers

C. Room air conditioners

D. All of these

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4

The cooling system used for supersonic aircrafts and rockets is

A. Simple air cooling system

B. Bootstrap air cooling system

C. Reduced ambient air cooling system

D. Regenerative air cooling system

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4

For obtaining high COP, the pressure range of compressor should be

A. High

B. Low

C. Optimum

D. Any value

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4

If a gas is to be liquefied, its temperature must be

A. Increased to a value above its critical temperature

B. Reduced to a value below its critical temperature

C. Equal to critical temperature

D. None of the above

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4

When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

A. Operating the machine at higher speeds

B. Operating the machine at lower speeds

C. Raising the higher temperature

D. Lowering the higher temperature

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4

The boiling point of carbon dioxide is

A. -20.5°C

B. -50°C

C. -63.3°C

D. -78.3°C

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4

Which of the following statement is correct?

A. The constant enthalpy lines are also constant wet bulb temperature lines.

B. The wet bulb and dry bulb temperature are equal at saturation condition.

C. The wet bulb temperature is a measure of enthalpy of moist air.

D. All of the above

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4

One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice

A. In 1 hour

B. In 1 minute

C. In 24 hours

D. In 12 hours

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4

Formation of frost on evaporator in refrigerator

A. Results in loss of heat due to poor heat transfer

B. Increases heat transfer rate

C. Is immaterial

D. Can be avoided by proper design

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4

The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called

A. Kinetic theory of gases

B. Newton's law of gases

C. Dalton's law of partial pressures

D. Avogadro's hypothesis

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4

In vapour compression cycle the condition off refrigerant is dry saturated vapour

A. After passing through the condenser

B. Before passing through the condenser

C. After passing through the expansion or throttle valve

D. Before entering the compressor

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4

In chemical dehumidification process,

A. Dew point temperature decreases

B. Wet bulb temperature decreases

C. Dry bulb temperature increases

D. All of these

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4

The temperature of air recorded by a thermometer, when it is not affected by the moisture present in the air, is called

A. Wet bulb temperature

B. Dry bulb temperature

C. Dew point temperature

D. None of these

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4

The evaporator used in household refrigerators is

A. Frosting evaporator

B. Non-frosting evaporator

C. Defrosting evaporator

D. None of these

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4

Mass flow ratio of NH₃ in comparison to Freon12 for same refrigeration load and same temperature limits is of the order of

A. 1 : 1

B. 1 : 9

C. 9 : 1

D. 1 : 3

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4

The colour of the flame of halide torch, in case of leakage of Freon refrigerant, will change to

A. Bright green

B. Yellow

C. Red

D. Orange

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4

The boiling point of ammonia is

A. -10.5°C

B. -30°C

C. -33.3°C

D. -77.7°C

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4

The coefficient of performance is the ratio of the refrigerant effect to the

A. Heat of compression

B. Work done by compressor

C. Enthalpy increase in compressor

D. All of the above

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4

During cooling and dehumidification, dry bulb temperature

A. Remains constant

B. Increases

C. Decreases

D. None of these