The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

A multiple effect evaporator as compared to a single effect evaporator of the same capacity has

A

Lower heat transfer area

B

Lower steam economy

C

Higher steam economy

D

Higher solute concentration in the product

The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

A

Less pronounced

B

More pronounced

C

Equal

D

Data insufficient, can't be predicted

In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to

A

Collect liquid refrigerant and prevent it from going to compressor

B

Detect liquid in vapour

C

Superheat the vapour

D

Collect vapours

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

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

For the same heat transfer area and the terminal conditions, the ratio of the capacities of a single effect evaporator to a triple effect evaporator is

A

3

B

0.33

C

1

D

1.33

The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.

A

More

B

Less

C

Equally

D

Unpredictable

A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

A

Is economical in operation

B

Employs high velocity, high heat transfer rate and less heating surface requirement

C

Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

D

Both B & C

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

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

The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

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