Formation of frost on evaporator in refrigerator

The formation of frost on cooling coils in a refrigerator

A

Increases heat transfer

B

Improves C.O.P. of the system

C

Increases power consumption

D

Reduces power consumption

Frost formation on the evaporator tubes in the domestic refrigerators

A

Can be prevented by proper design

B

Decreased compressor power

C

Causes heat loss due to poor heat transfer

D

Is immaterial

One fourth the price of a TV is equal to 1/6th the price of a refrigerator. If the total cost of the TV and the refrigerator is Tk 60000, what is the price of the TV?

A

Tk 22000

B

Tk 24000

C

Tk 27500

D

None of these

For better C.O.P of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be

A

Small

B

High

C

Equal

D

Anything

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

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 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

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

A dilute aqueous solution is to be concentrated in an evaporator system. High pressure steam is available. Multiple effect evaporator system is employed, because

A

Total heat transfer area of all the effects is -less than that in a single effect evaporator system

B

Total amount of vapor produced per Kg of feed steam in a multiple effect system is much higher than in a single effect

C

Boiling point elevation in a single effect system is much higher than that in any effect in a multieffect system

D

Heat transfer co-efficient in a single effect is much lower than that in any effect in a multieffect system

In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.

A

Increases

B

Decreases

C

Remains constant

D

May increase or decrease, depends on the vacuum

Formation of frost on evaporator in refrigerator

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