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.Management Sciences
Category: Stoichiometry
High porosity refractory bricks have________________?
A. Poor resistance to the penetration of molten slag, metal & flue gases
B. Poor heat conductivity & low strength
C. Better thermal spalling resistance
D. All A., B. and C.
The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the_______________?
A. Nature of both the gas & the liquid
B. Temperature
C. Total pressure
D. None of these
The depression in freezing point of a solution is________________?
A. Inversely proportional to the mass of solvent
B. Directly proportional to the mole of solute
C. Both A. and B.
D. Neither A. nor B.
At a temperature of 0°K, the molecules of a gas have only _______________ energy?
A. Rotational
B. Vibrational
C. Translational
D. None of these
Pick out the wrong unit conversion of thermal conductivity ?
A. 1 BTU/ft2.hr.°F/ft = 1.488 kcal/m2. hr.°C/m
B. 1 BTU/ft2.hr.°F/inch = 1.488 kcal/m2. hr.°C/m
C. 1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K
D. 1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F
The value of (Cp – Cv) for a real gas obeying Vander Wall’s equation is____________________?
A. R
B. > R
C. < R
D. 0.5 R
Heat of transition is the heat evolved or absorbed, when a substance is converted from_________________?
A. Vapor to liquid
B. Vapor to solid
C. Solid to liquid
D. One allotropic form to another allotropic form
Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?
A. PvB
B. xB.PvB
C. (Patm – Pvw)xB
D. xB.Patm
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