Related Questions

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
The undesirable property of a refrigerant is
A Non-toxic
B Non-flammable
C Non-explosive
D High boiling point
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
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
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
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 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
Which of the following is an undesirable property for an absorbing solvent?
A Low vapour pressure
B Low velocity
C Low freezing point
D None of these

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