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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

Correct Answer :

C. Reversed Joule cycle


Related Questions

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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

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

While designing the refrigeration system of an aircraft, the prime consideration is that the

A. System has high C.O.P.

B. Power per TR is low

C. Mass of refrigerant circulated in the system is low

D. Mass of the refrigeration equipment is low

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4

The value of C.O.P in vapour compression cycle is usually

A. Always less than unity

B. Always more than unity

C. Equal to unity

D. Any one of the above

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4

Air conditioning means

A. Cooling

B. Heating

C. Dehumidifying

D. All of these

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4

Air refrigerator works on

A. Reversed Carnot cycle

B. Bell Coleman cycle

C. Both (A) and (B)

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

A refrigerant with the highest critical pressure is

A. R-11

B. R-12

C. R-22

D. Ammonia

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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 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

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

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

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

Ammonia absorption refrigeration cycle requires

A. Very little work input

B. Maximum work input

C. Nearly same work input as for vapour compression cycle

D. Zero work input

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4

The coefficient of performance (C.O.P.) of a refrigerator working as a heat pump is given by

A. (C.O.P.)P = (C.O.P.)R + 2

B. (C.O.P.)P = (C.O.P.)R + 1

C. (C.O.P)P = (C.O.P)R - 1

D. (C.O.P)P = (C.O.P)R

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4

In vapour compression cycle, the condition of refrigerant is very wet 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 compressor

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4

Most thermostatic expansion valves are set for a superheat of

A. 5°C

B. 10°C

C. 15°C

D. 20°C

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4

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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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

During sensible heating of air _________ decreases.

A. Wet bulb temperature

B. Relative humidity

C. Dry bulb temperature

D. Specific humidity

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4

A refrigerant compressor is used to

A. Raise the pressure of the refrigerant

B. Raise the temperature of the refrigerant

C. Circulate the refrigerant through the refrigerating system

D. All of the above

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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

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4

Nusselt number (NN) is given by

A. NN = hl/k

B. NN = μ cp/k

C. NN = ρ V l /μ

D. NN = V²/t.cp

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4

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

A. Same

B. Low

C. Very low

D. High

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4

A thermostatic expansion valve in a refrigeration system

A. Ensures the evaporator completely filled with refrigerant of the load

B. Is suitable only for constant load systems

C. Maintains different temperatures in evaporator in proportion to load

D. None of the above

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4

The specific humidity during humidification process

A. Remains constant

B. Increases

C. Decreases

D. None of these

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4

A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

A. Automatic expansion valve

B. High side float valve

C. Thermostatic expansion valve

D. Low side float valve

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4

The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is

A. High pressure saturated liquid

B. Wet vapour

C. Very wet vapour

D. Dry vapour

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4

The humidification process, on the psychrometric chart is shown by

A. Horizontal line

B. Vertical line

C. Inclined line

D. Curved line

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4

Carbon dioxide is

A. Colourless

B. Odourless

C. Non-flammable

D. All of these