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.Management Sciences
Category: Chemical Engineering Basics
A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place_________________?
A. The better insulation material should be put just next to pipe (i.e., inside)
B. The better insulating material should be put outside
C. Either of the insulating material could be put on either side
D. Steam temperature is considered before deciding as to which insulating material is to be put
inside (i.e., just next to the pipe)
Nitriding of a steel part does not increase its__________________?
A. Grain size
B. Fatigue limit
C. Surface hardness
D. Wear resistance
Air-petrol ratio in an automotive petrol engine is around ________________?
A. 14 : 1
B. 22 : 1
C. 25 : 1
D. 4 : 1
Heat flow across a hollow sphere of inner radius ‘r1’ and outer radius ‘r2’ is directly proportional to__________________?
A. (r2 – r1)/r1. r2
B. r1. r2/(r2 – r1)
C. (r2 + r1)/r1. r2
D. r1. r2/(r2 + r1)
The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding _______________ grinding wheel is normally used ?
A. Hard
B. Soft
C. Silicon carbide
D. Aluminium oxide
Matte smelting is used in the extraction of_____________________?
A. Lead
B. Zinc
C. Aluminium
D. Copper
Uniform ramming of sand in green sand moulding process leads to____________________?
A. Reduced chance of gas porosity
B. Greater dimensional stability of the casting
C. Uniform flow of molten metal into the mould cavity
D. Less sand expansion type of casting defect
Blow off cock is provided in steam boiler to ____________________?
A. Guard the boiler in case of abnormal rise in steam pressure
B. Drain out water and sludge during its repair
C. Regulate the supply of water in boiler
D. Put out the fire in the furnace when the water level in the boiler falls to unsafe limit
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