The following cycle is used for air craft refrigeration

Pressure-enthalpy chart is useful in refrigeration. The change in internal energy of an ideal fluid used in ideal refrigeration cycle is

A

Positive

B

Negative

C

Zero

D

Infinity

A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

A

Vapor compression cycle using expansion valve

B

Air refrigeration cycle

C

Vapor compression cycle using expansion engine

D

Carnot refrigeration cycle

Air refrigeration cycle is used in the air crafts, because of

A

Low temperature encountered at high altitude

B

Its high heat transfer rate

C

Its low unit weight per ton of refrigeration

D

Its higher co-efficient of performance (COP)

One Ton of Refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice---

A

In 1 hour

B

In 24 hour

C

In 10 minutes

D

In 12 hour

The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system

A

Is as light as possible

B

Has very high C.O.P

C

Employs minimum quantity of refrigerant

D

Consumer minimum horse power

A refrigeration cycle is the same as a __________ cycle,

A

Turbine

B

Heat engine

C

Reversed heat engine

D

None of these

Air refrigeration cycle is used in

A

Domestic refrigerators

B

Commercial refrigerators

C

Air conditioning

D

Gas liquefaction

In aircraft, air refrigeration Cycle is used because of

A

Low weight per tonne of refrigeration

B

High heat transfer rate

C

Low temperature at high altitudes

D

Higher coefficient of performance

Which of the following is the result of a reduction in operating pressure in the Air refrigeration cycle?

A

decrease in C.O.P.

B

always decreases

C

increase in C.O.P.

D

no change in C.O.P.

Air-refrigeration cycle

A

Is the most efficient of all refrigeration cycles

B

Has very low efficiency

C

Requires relatively large quantities of air to achieve a significant amount of refrigeration

D

Both B and C

The following cycle is used for air craft refrigeration

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