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4

Air refrigeration operates on

A. Carnot cycle

B. Reversed Carnot cycle

C. Rankines cycle

D. Brayton cycle

Correct Answer :

D. Brayton cycle


Related Questions

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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 a lithium bromide absorption refrigeration system

A. Lithium bromide is used as a refrigerant and water as an absorbent

B. Water is used as a refrigerant and lithium bromide as an absorbent

C. Ammonia is used as a refrigerant and lithium bromide as an absorbent

D. None of the above

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4

The thermal diffusivity for gases is generally __________ those for liquids.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

The COP of a domestic refrigerator

A. Is less than 1

B. Is more than 1

C. Is equal to 1

D. Depends upon the make

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4

The dry bulb temperature lines, on the psychrometric chart are

A. Vertical and uniformly spaced

B. Horizontal and uniformly spaced

C. Horizontal and non-uniformly spaced

D. Curved lines

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4

The reduced ambient air cooling system has

A. One cooling turbine and one heat exchanger

B. One cooling turbine and two heat exchangers

C. Two cooling turbines and one heat exchanger

D. Two cooling turbines and two heat exchangers

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4

In a vapour compression system, the condition of refrigerant is dry saturated vapour

A. Before entering the compressor

B. After leaving the compressor

C. Before entering the condenser

D. After leaving the condenser

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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

Ammonia is

A. Non-toxic

B. Non-inflammable

C. Toxic and non-inflammable

D. Highly toxic and inflammable

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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

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

The temperature of ammonia after compression in a vapour compression system is

A. 20 to 50°C

B. 50 to 70°C

C. 70 to 110°C

D. None of these

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4

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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4

During humidification process, __________ increases.

A. Wet bulb temperature

B. Relative humidity

C. Dry bulb temperature

D. Specific humidity

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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

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

In a vapour compression system, the condition of refrigerant before passing through the condenser is

A. Saturated liquid

B. Wet vapour

C. Dry saturated vapour

D. Superheated vapour

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4

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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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 boiling point of carbon dioxide is

A. -20.5°C

B. -50°C

C. -63.3°C

D. -78.3°C

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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 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 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

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 air cooling system mostly used in transport type aircrafts is

A. Simple air cooling system

B. Simple evaporative air cooling system

C. Bootstrap air cooling system

D. All of these

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4

When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

A. Positive

B. Negative

C. Zero

D. None of these

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4

The central air conditioning system has ________ overall efficiency as compared to individual systems.

A. Same

B. Lower

C. Higher

D. None of these

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4

The lowest temperature during the cycle in a vapour compression system occurs after

A. Compression

B. Expansion

C. Condensation

D. Evaporation

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4

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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4

The freezing point of sulphur dioxide is

A. -56.6°C

B. -75.2°C

C. -77.7°C

D. -135.8°C