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.Management Sciences
Category: Chemical Engineering Basics
Annealing of white cast iron produces _____________________ iron?
A. Grey
B. Nodular
C. Malleable
D. Spheroidal
Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of Portland cement. The component of Portland cement which first hardens is_____________________?
A. 5CaO. 3 Al2O3
B. 3CaO. Al2O3
C. 3CaO. SiO2
D. 2CaO. SiO2
To improve the machinability of steel, it is generally subjected to _____________________?
A. Spheroidising
B. Tempering
C. Normalising
D. Annealing
With increase in steam pressure, its specific volume decreases ____________________?
A. Rapidly first and then slowly
B. Linearly
C. Slowly first and then rapidly
D. Exponentially
Thermal conductivity of a material does not depend upon its_____________________?
A. Mass
B. Volume
C. Surface area
D. All A, C & C
Percentage of argon (by volume) in dry atmospheric air is about________________?
A. 0.09
B. 0.3
C. 0.57
D. 0.94
Ultimate strength in tension as compared to that in shear for steel is____________________?
A. Half
B. One third
C. One and half times
D. One fourth
At the point of boundary layer separation in fluid flow, the _____________________?
A. Shear stress is maximum
B. Velocity gradient is flat
C. Density variation is maximum
D. Shear stress is zero
The normal stress is the same in all directions at a point in a fluid, only when the fluid__________________?
A. Is at rest & has zero viscosity
B. Is frictionless
C. Fluid layer has no motion relative to an adjacent layer of fluid
D. is incompressible & frictionless
Identify the false statement?
A. Martensitic steels are less susceptible to pitting corrosion than austenitic steels
B. Pitting corrosion is usually very localised
C. Hydrogen embrittlement is facilitated by tensile stress
D. Stress corrosion cracking is facilitated by tensile stress
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