Related Questions

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 desirable in petrol (gasoline) but undesirable in kerosene?
A Paraffins
B Aromatics
C Mercaptans
D Naphthenic acid
Which is the most desirable component of a good quality kerosene?
A I-paraffins
B Aromatics
C N-paraffins
D Naphthenes
Fugacity of a component in an ideal gas mixture is euqal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at contant pressure and temperature __________ as its mole fraction increases.
A Decreases
B Decreases exponentially
C Increases
D Remains constant
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when
A Only vapor phase follows Raoult's law
B Only liquid phase obeys Dalton's law
C Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
D Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
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
Which of the following reactions is undesirable in the production of catalytically reformed gasoline?
A Dehydrogenation of naphthene
B Dehydrogenation of lower paraffins
C Dehydrocyclisation of higher paraffins
D Isomerisation of paraffins
The constituent of cement which is responsible for all the undesirable properties of cement is
A Di-calcium silicate
B Tri-calcium silicate
C Tri-calcium aluminate
D Tetra calcium alumino ferrite
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

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