Which of the following is not a desirable property of a refrigerant?

The desirable property of a refrigerant is

A

Low boiling point

B

High critical temperature

C

High latent heat of vaporisation

D

All of these

The undesirable property of a refrigerant is

A

Non-toxic

B

Non-flammable

C

Non-explosive

D

High boiling point

High __________ is an undesirable property for a good refrigerant.

A

Specific heat

B

Latent heat of vaporisation

C

Viscosity

D

Specific vapor volume

Pick out the undesirable property for a good refrigerant.

A

High thermal conductivity

B

Low freezing point

C

Large latent heat of vaporisation

D

High viscosity

Which of the following property is not necessarily desirable in the material for transformer core?

A

Mechanical strength

B

Low hysteresis loss

C

High thermal conductivity

D

High permeability

Which of the following property is desirable for materials used in tools and machines?

A

Elasticity

B

Plasticity

C

Ductility

D

Malleability

Which of the following property is desirable in parts subjected to shock and impact loads?

A

Strength

B

Stiffness

C

Brittleness

D

Toughness

Which of the following is not a common refrigerant?

A

Freon-12

B

Ethylene

C

Ammonia

D

Carbon dioxide

Which is not a refrigerant?

A

SO₂

B

NH₃

C

CCl₂F₂

D

C₂H₄Cl₂

which of the following refrigerant has the lowest freezing point?

A

Freon -11

B

Freon -12

C

Freon -22

D

Ammonia

Which of the following is not a desirable property of a refrigerant?

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