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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

Correct Answer :

C. Low pressure vapour refrigerant


Related Questions

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4

In case of sensible cooling of air, the coil efficiency is given by

A. B.P.F. - 1

B. 1 - B.P.F.

C. 1/ B.P.F.

D. 1 + B.P.F.

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4

Chaperon equation is applicable for registration at

A. Saturation point of vapour

B. Saturation point of liquid

C. Sublimation temperature

D. Triple point

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4

Highest pressure encountered in a refrigeration system should be

A. Critical pressure of refrigerant

B. Much below critical pressure

C. Much above critical pressure

D. Near critical pressure

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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

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

A. Condenser

B. Evaporator

C. Compressor

D. Expansion valve

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4

In vapour compression cycle the condition of refrigerant is superheated vapour

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

Highest temperature encountered in refrigeration cycle should be

A. Near critical temperature of refrigerant

B. Above critical temperature

C. At critical Temperature

D. Much below critical temperature

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4

The capillary tube is not used in large capacity refrigeration systems because

A. Cost is too high

B. Capacity control is not possible

C. It is made of copper

D. Required pressure drop cannot be achieved

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4

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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4

Which of the following statement is correct for ammonia as a refrigerant?

A. It is toxic to mucous membranes.

B. It requires large displacement per TR compared to fluoro carbons.

C. It reacts with copper and its alloys.

D. All of these

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4

During dehumidification process, the relative humidity

A. Remains constant

B. Increases

C. Decreases

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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4

During adiabatic saturation process on unsaturated air __________ remains constant.

A. Relative humidity

B. Dew point temperature

C. Dry bulb temperature

D. Wet bulb temperature

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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

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

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

Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

A. These react with water vapour and cause acid rain

B. These react with plants and cause greenhouse effect

C. These react with oxygen and cause its depletion

D. These react with ozone layer

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4

When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

A. Operating the machine at higher speeds

B. Operating the machine at lower speeds

C. Raising the higher temperature

D. Lowering the higher temperature

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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 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

Bell Coleman cycle is a

A. Reversed Carnot cycle

B. Reversed Otto cycle

C. Reversed Joule cycle

D. Reversed Rankine cycle

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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

The operating temperature of a cold storage is 2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

A. 1.86 kW

B. 3.72 kW

C. 7.44 kW

D. 18.6 kW

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4

The boiling point of ________ is 10.5°C.

A. Ammonia

B. R-12

C. Sulphur dioxide

D. Carbon dioxide

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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

For unsaturated air, the dew point temperature is __________ wet bulb temperature.

A. Equal to

B. Less than

C. More than

D. None of these

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4

If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be

A. Same

B. More

C. Less

D. More/less depending on rating

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4

For obtaining high COP, the pressure range of compressor should be

A. High

B. Low

C. Optimum

D. Any value

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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 domestic refrigerator uses following type of compressor

A. Centrifugal

B. Axial

C. Miniature sealed unit

D. Piston type reciprocating