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4

The process, generally used in summer air conditioning to cool and dehumidify the air, is called

A. Humidification

B. Dehumidification

C. Heating and humidification

D. Cooling and dehumidification

Correct Answer :

D. Cooling and dehumidification


Related Questions

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4

In which of the following refrigeration system, waste heat can be effectively used?

A. Vapour compression cycle

B. Vapour absorption cycle

C. Air refrigeration cycle

D. None of these

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4

Which of the following refrigerant is highly toxic and flammable?

A. Ammonia

B. Carbon dioxide

C. Sulphur dioxide

D. R-12

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4

The mass of water vapour present in __________ is called absolute humidity.

A. 1 m3 of water

B. 1 m3 of dry air

C. 1 kg of wet air

D. 1 kg of dry air

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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 humidification 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 coefficient of performance of a domestic refrigerator is ________ as compared to a domestic air-conditioner.

A. Same

B. Less

C. More

D. None of these

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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

Under cooling in a refrigeration cycle

A. Increases C.O.P

B. Decreases C.O.P

C. C.O.P remains unaltered

D. Other factors decide C.O.P

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4

In a saturated air-water vapour mixture, the

A. Dry bulb temperature is higher than wet bulb temperature

B. Dew point temperature is lower than wet bulb temperature

C. Dry bulb, wet bulb and dew point temperature are same

D. Dry bulb temperature is higher than dew point temperature

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4

The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil)

A. (td₂ - td₃)/(td₃ - td₁)

B. (td₃ - td₂)/(td₃ - td₁)

C. (td₃ - td₁)/(td₂ - td₃)

D. (td₃ - td₁)/(td₃ - td₂)

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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

The humidity ratio or specific humidity is the mass of water vapour present in

A. 1 m3 of wet air

B. 1 m3 of dry air

C. 1 kg of wet air

D. 1 kg of dry air

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4

During sensible cooling of air ________ decreases.

A. Wet bulb temperature

B. Relative humidity

C. Dry bulb temperature

D. Specific humidity

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4

The wet bulb depression indicates _________ humidity of the air.

A. Absolute

B. Relative

C. Specific

D. None of these

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4

Air refrigeration operates on

A. Carnot cycle

B. Reversed Carnot cycle

C. Rankines cycle

D. Brayton cycle

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4

The process, generally used in summer air conditioning to cool and dehumidify the air, is called

A. Humidification

B. Dehumidification

C. Heating and humidification

D. Cooling and dehumidification

What is the correct answer?

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

Which of the following statement is correct?

A. In vapour absorption refrigerator, the compression of refrigerant is avoided.

B. Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser.

C. In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke.

D. All of the above

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4

Vertical lines on pressure-enthalpy chart show constant

A. Pressure lines

B. Temperature lines

C. Total heat lines

D. Entropy lines

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4

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

A. (C.O.P.)P = (C.O.P.)R + 2

B. (C.O.P.)P = (C.O.P.)R + 1

C. (C.O.P)P = (C.O.P)R - 1

D. (C.O.P)P = (C.O.P)R

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4

Freon group of refrigerants are

A. Inflammable

B. Toxic

C. Non-inflammable and toxic

D. Nontoxic and non-inflammable

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4

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

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 expansion valve

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4

The human body feels comfortable when the heat stored in the body is

A. Positive

B. Negative

C. Zero

D. None of these

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4

The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature of air entering the cooling coil, td₂ = Dry bulb temperature of air leaving the cooling coil, and td₃ = Dry bulb temperature of the cooling coil)

A. (td₁ -td₃)/( td₂ -td₃)

B. (td₂ -td₃)/( td₁ -td₃)

C. (td₃ -td₁)/( td₂ -td₃)

D. (td₃ -td₂)/( td₁ -td₃)

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4

The refrigerant widely used in domestic refrigerators is

A. Ammonia

B. Carbon dioxide

C. Sulphur dioxide

D. R-12

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4

A standard ice point temperature corresponds to the temperature of

A. Water at 0°C

B. Ice at 4°C

C. Solid and dry ice

D. Mixture of ice and water under equilibrium conditions

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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

The wet bulb temperature at 100% relative humidity is ________ dry bulb temperature.

A. Same as

B. Lower than

C. Higher than

D. None of these

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4

The difference between dry bulb temperature and wet bulb temperature, is called

A. Dry bulb depression

B. Wet bulb depression

C. Dew point depression

D. Degree of saturation

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4

The pressure at the outlet of a refrigerant compressor is called

A. Suction pressure

B. Discharge pressure

C. Critical pressure

D. Back pressure