During heating and dehumidification process, dry bulb temperature

Question

During heating and dehumidification process, dry bulb temperature

A. Remains constant

B. Increases

C. Decreases

D. None of these

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

A. Condenser

B. Evaporator

C. Compressor

D. Expansion valve

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During sensible heating of air _________ decreases.

A. Wet bulb temperature

B. Relative humidity

C. Dry bulb temperature

D. Specific humidity

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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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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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The dehumidification process, on the psychrometric chart, is shown by

A. Horizontal line

B. Vertical line

C. Inclined line

D. Curved line

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Nusselt number (N_N) is given by

A. N_N = hl/k

B. N_N = μ c_p/k

C. N_N = ρ V l /μ

D. N_N = V²/t.c_p

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The leakage in a refrigeration system using Freon is detected by

A. Halide torch

B. Sulphur sticks

C. Soap and water

D. All of these

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In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to

A. Collect liquid refrigerant and prevent it from going to compressor

B. Detect liquid in vapour

C. Superheat the vapour

D. Collect vapours

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During heating and dehumidification process, dry bulb temperature

A. Remains constant

B. Increases

C. Decreases

D. None of these

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The COP of a vapour compression plant in comparison to vapour absorption plant is

A. More

B. Less

C. Same

D. More/less depending on size of plant

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The advantage of dry compression is that

A. It permits higher speeds to be used

B. It permits complete evaporation in the evaporator

C. It results in high volumetric and mechanical efficiency

D. All of the above

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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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The evaporator changes the low pressure liquid refrigerant from the expansion valve into

A. High pressure liquid refrigerant

B. Low pressure liquid and vapour refrigerant

C. Low pressure vapour refrigerant

D. None of these

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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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During humidification process, dry bulb temperature

A. Remains constant

B. Increases

C. Decreases

D. None of these

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A refrigerant with the highest critical pressure is

A. R-11

B. R-12

C. R-22

D. Ammonia

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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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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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The sensible heat factor during the heating and humidification process is given by (where h₁ = Enthalpy of air entering the heating coil, h₂ = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification 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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The process of under-cooling is generally brought about by

A. Circulating more quantity of cooling water through the condenser

B. Using water colder than the main circulating water

C. Employing a heat exchanger

D. Any one of the above

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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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The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

A. Sub-cooling or under-cooling

B. Super-cooling

C. Normal cooling

D. None of these

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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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The dry bulb temperature during sensible heating of air

A. Remains constant

B. Increases

C. Decreases

D. None of these

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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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During humidification process, __________ increases.

A. Wet bulb temperature

B. Relative humidity

C. Dry bulb temperature

D. Specific humidity

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

A. Increase

B. Decrease

C. Remain unaffected

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

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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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Accepted Answer

B. Increases

During heating and dehumidification process, dry bulb temperature

Correct Answer :

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Related Questions

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

During sensible heating of air _________ decreases.

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

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

The dehumidification process, on the psychrometric chart, is shown by

Nusselt number (N_N) is given by

The leakage in a refrigeration system using Freon is detected by

In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to

During heating and dehumidification process, dry bulb temperature

The COP of a vapour compression plant in comparison to vapour absorption plant is

The advantage of dry compression is that

The pressure at the inlet of a refrigerant compressor is called

The evaporator changes the low pressure liquid refrigerant from the expansion valve into

The freezing point of R-12 is

During humidification process, dry bulb temperature

A refrigerant with the highest critical pressure is

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)

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

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

The process of under-cooling is generally brought about by

Which of the following refrigerant has the lowest freezing point?

The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

Formation of frost on evaporator in refrigerator

The dry bulb temperature during sensible heating of air

The boiling point of ammonia is

During humidification process, __________ increases.

The evaporator used in household refrigerators is

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

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

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

Also checkout

During heating and dehumidification process, dry bulb temperature

Correct Answer :

Show all Refrigeration & Air-Conditioning MCQ

Related Questions

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

During sensible heating of air _________ decreases.

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

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

The dehumidification process, on the psychrometric chart, is shown by

Nusselt number (NN) is given by

The leakage in a refrigeration system using Freon is detected by

In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to

During heating and dehumidification process, dry bulb temperature

The COP of a vapour compression plant in comparison to vapour absorption plant is

The advantage of dry compression is that

The pressure at the inlet of a refrigerant compressor is called

The evaporator changes the low pressure liquid refrigerant from the expansion valve into

The freezing point of R-12 is

During humidification process, dry bulb temperature

A refrigerant with the highest critical pressure is

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)

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

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

The process of under-cooling is generally brought about by

Which of the following refrigerant has the lowest freezing point?

The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

Formation of frost on evaporator in refrigerator

The dry bulb temperature during sensible heating of air

The boiling point of ammonia is

During humidification process, __________ increases.

The evaporator used in household refrigerators is

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

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

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

Also checkout

Nusselt number (N_N) is given by