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.Management Sciences
Category: Chemical Engineering Basics
Corrosion of metals cannot be prevented by its__________________?
A. Tempering
B. Chromising
C. Aluminising
D. Alloying
A form of stress corrosion failure termed as ‘season cracking’ is generally observed in __________________?
A. Thermosetting polymers
B. High carbon steels
C. Brasses
D. Borosilicate glasses
Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of_____________________?
A. 90% tungsten carbide and 10% cobalt
B. 70% aluminium oxide & 30% silica
C. 30% nickel, 15% chromium & 55% tungsten
D. 65% tungsten & 35% zirconium
Suitability of steel for its use in cable is judged by its strength in__________________?
A. Tension
B. Compression
C. Torsion
D. Shear
For a spontaneous natural process at constant temperature and pressure, the free energy of the system always____________________?
A. Increases
B. Decreases
C. Remain constant
D. Increases to a maximum before decreasing
The minimum temperature to which the water can be cooled in a cooling tower is the ______________ temperature of air?
A. Ambient
B. Dry bulb
C. Dew point
D. Wet bulb
A reduction in thermal resistance during heat transfer does not occur in the___________________?
A. Convection heat transfer by stirring the fluid and cleaning the heating surface
B. Conduction heat transfer by reduction in the material thickness and increase in the thermal
conductivity
C. Radiation heat transfer by increasing the temperature and reducing the emissivity
D. None of these
Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type________________?
A. Parallel flow with equal heat capacities
B. Counter flow with equal heat capacities
C. Counter flow with unequal heat capacities
D. Parallel flow with unequal heat capacities
Damage to metal surface by mechanical action is called____________________?
A. Pitting
B. Corrosion
C. Erosion
D. None of these
For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg) ?
A. Propane and acetylene
B. Propane and LPG
C. Sewage gas and gobar gas
D. B.F gas and coke oven gas
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