Pick out the undesirable property for a good refrigerant.

High __________ is an undesirable property for a good refrigerant.

A

Specific heat

B

Latent heat of vaporisation

C

Viscosity

D

Specific vapor volume

Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation?

A

Decrease in effect

B

Increase in thrust

C

Develops noise

D

Develops high pressure

The undesirable property of a refrigerant is

A

Non-toxic

B

Non-flammable

C

Non-explosive

D

High boiling point

Pick out the undesirable property for a solvent meant for dewaxing of lube oil.

A

Complete miscibility with oil

B

High solubility of wax in the solvent

C

Both A & B

D

Neither A nor B

Which of the following is an undesirable characteristics of a refrigerant ?

A

It should be non-explosive

B

It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

C

Its vapor pressure at the condenser temperature should be very high

D

None of these

Point out which part is grammatically incorrect. 'Good people will make good laws ' 'but good' 'laws passed by a few' 'does not necessarily make' 'a good society' 'No error'

A

good people will make good laws

B

laws passed by a few

C

do not necessarily make

D

a good society

Which of the following is an undesirable property in a tower packing?

A

Large surface per unit volume

B

Large free cross-section

C

Low weight per unit volume

D

Large weight of liquid retained

Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore?

A

High fusibility & fluidity

B

High thermal conductivity

C

Low density

D

High chemical activity

Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding

A

Glycerol

B

Nitro cellulose

C

Camphor

D

None of these

Which of the following is an undesirable property of a manometric liquid?

A

Non-sticky & non-corrosive nature

B

High vapour pressure

C

Low viscosity & surface tension

D

Low co-efficient of thermal expansion

Pick out the undesirable property for a good refrigerant.

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