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4

The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called

A. Humidity ratio

B. Relative humidity

C. Absolute humidity

D. Degree of saturation

Correct Answer :

B. Relative humidity


Related Questions

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4

On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

A. Involves no change in volume

B. Takes place at constant temperature

C. Takes place at constant entropy

D. Takes place at constant pressure

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4

A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

A. Automatic expansion valve

B. High side float valve

C. Thermostatic expansion valve

D. Low side float 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

Hydrogen is used in Electrolux refrigeration system so as to _________ the rate of evaporation of the liquid ammonia passing through the evaporator.

A. Equalise

B. Reduce

C. Increase

D. None of these

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4

Allowable pressure on high pressure side or ammonia absorption system is of the order of

A. Atmospheric pressure

B. Slightly above atmospheric pressure

C. 24 bars

D. 56 bars

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4

The superheating in a refrigeration cycle

A. Does not alter C.O.P.

B. Increases C.O.P.

C. Decreases C.O.P.

D. None of these

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4

In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in

A. Condenser

B. Evaporator

C. Absorber

D. None of these

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4

A one tonne refrigerating machine means that

A. One tonne is the total mass of machine

B. One tonne refrigerant is used

C. One tonne of water can be converted into ice

D. One tonne of ice when melts from and at 0° C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min

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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 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

Which of the following refrigerant has the lowest boiling point?

A. Ammonia

B. Carbon dioxide

C. Sulphur dioxide

D. R-12

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4

The undesirable property of a refrigerant is

A. Non-toxic

B. Non-flammable

C. Non-explosive

D. High boiling point

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4

The vapour pressure of refrigerant should be

A. Lower than atmospheric pressure

B. Higher than atmospheric pressure

C. Equal to atmospheric pressure

D. Could be anything

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4

The thermostatic expansion valve is used in __________ type of evaporators.

A. Flooded

B. DX coil

C. Dry

D. None of these

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4

As relative humidity decreases, the dew point temperature will be ________ wet bulb temperature.

A. Same as

B. Lower than

C. Higher than

D. None of these

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4

Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and μ = Degree of saturation)

A. 0.622 Pv / (Pb - Pv)

B. μ/[1 - (1 - μ) (Ps/Pb)]

C. [Pv (Pb - Pd)]/ [Pd (Pb - Pv)]

D. None of these

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4

In a vapour compression cycle, the refrigerant immediately after expansion valve is

A. Liquid

B. Sub-cooled liquid

C. Saturated liquid

D. Wet vapour

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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 leakage in a refrigeration system using ammonia is detected by

A. Halide torch

B. Sulphur sticks

C. Soap and water

D. All of these

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4

The capacity of a domestic refrigerator is in the range of

A. 0.1 to 0.3 TR

B. 1 to 3 TR

C. 3 to 5 TR

D. 5 to 7 TR

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4

Pick up the wrong statement. A refrigerant should have

A. Tow specific heat of liquid

B. High boiling point

C. High latent heat of vaporisation

D. Higher critical temperature

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4

During cooling and dehumidification, dry bulb temperature

A. Remains constant

B. Increases

C. Decreases

D. None of these

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4

The freezing point of R-12 is

A. -86.6°C

B. -95.2°C

C. -107.7°C

D. -135.8°C

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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

During sensible cooling,

A. Relative humidity remains constant

B. Wet bulb temperature increases

C. Specific humidity increases

D. Partial pressure of vapour remains constant

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4

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

A. Dry air

B. Moist air

C. Saturated air

D. Specific humidity

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4

The condition of refrigerant after passing through the condenser in a vapour compression system is

A. Saturated liquid

B. Wet vapour

C. Dry saturated vapour

D. Superheated vapour

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4

Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system

A. Strong solution to weak solution

B. Weak solution to strong solution

C. Strong solution to ammonia vapour

D. Ammonia vapours to weak solution

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4

A refrigerant compressor is used to

A. Raise the pressure of the refrigerant

B. Raise the temperature of the refrigerant

C. Circulate the refrigerant through the refrigerating system

D. All of the above

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4

The difference between dry bulb temperature and dew point temperature, is called

A. Dry bulb depression

B. Wet bulb depression

C. Dew point depression

D. Degree of saturation