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What is the correct answer?

4

The horizontal and non-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 :

C. Dew point temperature


Related Questions

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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 dry bulb temperature during sensible heating of air

A. Remains constant

B. Increases

C. Decreases

D. None of these

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4

Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the value of COP of reversed Carnot Cycle?

A. 1.25

B. 0.8

C. 0.5

D. 0.25

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4

In order to collect liquid refrigerant and to prevent it from going to a ________, a device known as accumulator is used at the suction of compressor.

A. Compressor

B. Condenser

C. Expansion valve

D. Evaporator

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4

The sub-cooling 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

Superheating 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

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

The specific humidity during dehumidification process

A. Remains constant

B. Increases

C. Decreases

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

A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in ________ power per tonne of refrigeration.

A. Same

B. Lower

C. Higher

D. None of these

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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

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 power per tonne of refrigeration is

A. 3.5/C.O.P.

B. C.O.P/3.5

C. 3.5 × C.O.P.

D. None of these

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4

Accumulators should have adequate volume to store refrigerant charge at least

A. 10 %

B. 25 %

C. 50 %

D. 75 %

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4

The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

A. Same

B. More

C. Less

D. More or less depending on ambient conditions

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4

The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

A. Condensation of the refrigerant vapour

B. Evaporation of the refrigerant liquid

C. Compression of the refrigerant vapour

D. Metering of the refrigerant liquid

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4

Rick up the incorrect statement

A. Lithium bromide used in vapour absorption cycle is non volatile

B. Lithium bromide plant can't operate below 0°C

C. A separator is used in lithium bromide plant to remove the unwanted water vapour by condensing

D. Concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator

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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

Which of the following refrigerant has the lowest freezing point?

A. R-11

B. R-12

C. R-22

D. Ammonia

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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

A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

A. 25 kJ/kg

B. 50 kJ/kg

C. 100 kJ/kg

D. 125 kJ/kg

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4

In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by

A. Liquid pump

B. Generator

C. Absorber and generator

D. Absorber, generator and liquid pump

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4

During a refrigeration cycle, heat is rejected by the refrigerant in a

A. Compressor

B. Condenser

C. Evaporator

D. Expansion valve

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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

The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture of water and

A. Carbon dioxide

B. Sulphur dioxide

C. Lithium bromide

D. R-12

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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

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 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

In a refrigeration system, heat absorbed in comparison to heat rejected is

A. More

B. Less

C. Same

D. More for small capacity and less for high capacity

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4

The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will

A. Increase

B. Decrease

C. May increase or decrease depending on the type of refrigerant used

D. Remain unaffected