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
The main constituent of cement which is responsible for initial setting of cement is
A Dicalcium silicate
B Tricalcium silicate
C Tricalcium aluminate
D All of the above
For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
A 1 : 2
B 1 : 3
C 1 : 4
D 1 : 6
Which of the following is desirable in petrol (gasoline) but undesirable in kerosene?
A Paraffins
B Aromatics
C Mercaptans
D Naphthenic acid
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
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
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 characteristic for the solvent used in gas absorption?
A Low vapor pressure
B Low viscosity
C High gas solubility
D None of these

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