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4

The vapour compression refrigerator employs the following cycle

A. Rankine

B. Carnot

C. Reversed Rankine

D. Reversed Carnot

Correct Answer :

D. Reversed Carnot


Related Questions

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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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In a refrigeration cycle, the flow of refrigerant is controlled by

A. Compressor

B. Condenser

C. Evaporator

D. Expansion valve

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4

If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

A. 0.2

B. 1.2

C. 5

D. 6

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4

An important characteristic of absorption system of refrigeration is

A. Noisy operation

B. Quiet operation

C. Cooling below 0°C

D. Very little power consumption

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The undesirable property of a refrigerant is

A. Non-toxic

B. Non-flammable

C. Non-explosive

D. High boiling point

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The refrigerant for a refrigerator should have

A. High sensible heat

B. High total heat

C. High latent heat

D. Low latent heat

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Choose the correct statement

A. A refrigerant should have low latent heat

B. If operating temperature of system is low, then refrigerant with low boiling point should be used

C. Pre-cooling and sub-cooling bf refrigerant are same

D. Superheat and sensible heat of a refrigerant are same

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4

The cooling system used for supersonic aircrafts and rockets is

A. Simple air cooling system

B. Bootstrap air cooling system

C. Reduced ambient air cooling system

D. Regenerative air cooling system

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4

The bypass factor for a cooling coil

A. Increases with increase in velocity of air passing through it

B. Decreases with increase in velocity of air passing through it

C. Remains unchanged with increase in velocity of air passing through it

D. May increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering

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4

In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering air, then the air is

A. Heated and dehumidified

B. Heated and humidified

C. Cooled and humidified

D. Cooled and dehumidified

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4

An evaporator is also known as

A. Freezing coil

B. Cooling coil

C. Chilling coil

D. All of these

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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 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 chemical dehumidification process,

A. Dew point temperature decreases

B. Wet bulb temperature decreases

C. Dry bulb temperature increases

D. All of these

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During sensible cooling of air ________ decreases.

A. Wet bulb temperature

B. Relative humidity

C. Dry bulb temperature

D. Specific humidity

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4

A bootstrap air cooling system has

A. One heat exchanger

B. Two heat exchangers

C. Three heat exchangers

D. Four heat exchangers

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Which of the following statement is correct?

A. In vapour absorption refrigerator, the compression of refrigerant is avoided.

B. Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser.

C. In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke.

D. All of the above

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4

In a bootstrap air evaporative cooling system, the evaporator is provided

A. Between the combustion chamber and the first heat exchanger

B. Between the first heat exchanger and the secondary compressor

C. Between the secondary compressor and the second heat exchanger

D. Between the second heat exchanger and the cooling turbine

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4

Cooling water is required for following equipment in ammonia absorption plant

A. Condenser

B. Evaporator

C. Absorber

D. Condenser, absorber and separator (rectifier)

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4

Degree of saturation or percentage humidity is

A. The mass of water vapour present in 1 m³ of dry air

B. The mass of water vapour present in 1 kg of dry air

C. The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure.

D. 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

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4

Which of the following refrigerant has the maximum ozone depletion potential in the stratosphere?

A. Ammonia

B. Carbon dioxide

C. Sulphur dioxide

D. Fluorine

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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

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

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 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

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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

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

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

For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

A. Equal to

B. Less than

C. Greater than

D. None of these

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

A. Same

B. Low

C. Very low

D. High