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.Management Sciences
Category: CHEMICAL ENGINEERING
Cast iron has very high___________________?
A. Compressive strength
B. Ductility
C. Shock resistance
D. Resistance to brittleness
______________________ temperature remains constant during adiabatic saturation process of unsaturated air ?
A. Dew point
B. Dry bulb
C. Wet bulb
D. None of these
The dew point of a saturated gas phase equals the ________________ temperature?
A. Gas
B. Room
C. Wet bulb
D. None of these
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ?
A. Sphere
B. Cube
C. Cylinder (L/D = 1)
D. Raschig rings
When the steel is subjected to normalising, its ______________ decreases?
A. Yield point
B. Ductility
C. Ultimate tensile strength (UTS)
D. None of these
______________ catalytic reaction is involved in the thermal cracking of gas oil ?
A. Homogeneous
B. Non-Homogeneous
C. Heterogeneous
D. Non-Heterogeneous
Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the_________________?
A. Existence of thermal boundary layer
B. Temperature gradient produced due to density difference
C. Buoyancy of the bubbles produced at active nucleation site
D. None of these
A coal with high ash content is undesirable, as________________?
A. It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber
B. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace
and causes its spalling due to different co-efficient of expansion/contraction of the refractory
and the ash
C. The ash retains the sulphur & phosphorus and thus affects the quality of products in
metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to
the boiler tubes thereby reducing the heat transfer
D. All A., B. and C.
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