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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

Correct Answer :

A. Same as


Related Questions

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4

One of the purposes of sub cooling the liquid refrigerant is to

A. Reduce compressor overheating

B. Reduce compressor discharge temperature

C. Increase cooling effect

D. Ensure that only liquid and not the vapour enters the expansion (throttling) valve

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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

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

In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

A. 1

B. 1.25

C. 2.15

D. 5.12

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4

Short horizontal lines on pressure-enthalpy chart show

A. Constant pressure lines

B. Constant temperature lines

C. Constant total heat lines

D. Constant entropy lines

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4

For air conditioning the operation theatre in a hospital, the percentage of outside air in the air supplied is

A. Zero

B. 20

C. 50

D. 100

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4

The sensible heat factor during cooling and dehumidification process is given by (where h₁ = Enthalpy of air entering the cooling coil, h₂ = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process)

A. (hA - h2)/ (h1 - h2)

B. (h2 - hA)/ (h1 - h2)

C. (h1 - h2)/ (hA - h2)

D. (hA - h1)/ (h2 - h1)

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4

The conditioned air supplied to the room must have the capacity to take up

A. Room sensible heat load only

B. Room latent heat load only

C. Both room sensible heat and latent heat loads

D. None of the above

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4

Critical temperature is the temperature above which

A. A gas will never liquefy

B. A gas will immediately liquefy

C. Water will evaporate

D. Water will never evaporate

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4

The pressure at the inlet of a refrigerant compressor is called

A. Suction pressure

B. Discharge pressure

C. Critical pressure

D. Back pressure

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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

In a refrigerating machine, heat rejected is _________ heat absorbed.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

The emissivity of a polished silver body is __________ as compared to black body.

A. Same

B. Low

C. Very low

D. High

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4

In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

A. Reversed Carnot cycle

B. Reversed Joule cycle

C. Reversed Brayton cycle

D. Reversed Otto cycle

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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

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

During heating and humidification, the final relative humidity of air

A. Can be lower or higher than that of the entering air

B. Is lower than that of the entering air

C. Is higher than that of the entering air

D. None of the above

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4

The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

A. Will be higher

B. Will be lower

C. Will remain unaffected

D. May be higher or lower depending upon the nature of noncondensable gases

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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

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4

The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called

A. Coefficient of performance of refrigeration

B. Coefficient of performance of heat pump

C. Relative coefficient of performance

D. Refrigerating efficiency

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4

For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

A. Copper

B. Aluminium

C. Steel

D. Brass

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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

Which of the following statement is correct?

A. The human body can lose heat even if its temperature is less than the atmospheric temperature.

B. The increase in air movement increases the evaporation from the human body.

C. The warm air increases the rate of radiation of heat from the human body.

D. Both (A) and (B)

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4

A refrigeration system

A. Removes heat from a low temperature body and delivers it to a high temperature body

B. Removes heat from a high temperature body and delivers it to a low temperature body

C. Rejects energy to a low temperature body

D. None of the above

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4

In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

A. Expansion valve to the evaporator

B. Evaporator to the thermostat

C. Condenser to the expansion valve

D. Condenser to the evaporator

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4

The evolution of heat of solution takes place in ammonia absorption plant when

A. Ammonia vapour goes into solution

B. Ammonia vapour is driven out of solution

C. Lithium bromide mixes with ammonia

D. Weak solution mixes with strong solution

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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

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

When the air is passed through an insulated chamber having sprays of water maintained at a temperature higher than the dew point temperature of entering air but lower than its dry bulb temperature, then the air is said to be

A. Cooled and humidified

B. Cooled and dehumidified

C. Heated and humidified

D. Heated and dehumidified

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4

The curved lines on a psychrometric chart indicates

A. Dry bulb temperature

B. Wet bulb temperature

C. Dew point temperature

D. Relative humidity