941. The heat transfer co-efficient in film type condensation is _______________ that for dropwise condensation?
A. Greater than
B. Lower than
C. Is same as
D. Half

942. The equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?
A. Colburn
B. Reynolds
C. Prandtl
D. None of these

943. Stefan-Boltzmann law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K) ?
A. t4
B. T4
C. 1/t4
D. 1/T4

944. Boiling point elevation for a strong and concentrated solution is found by Duhring’s rule, which states that at the same pressure, the boiling point of a solution is a linear function of the _______________ of pure water?
A. Boiling point
B. Dynamic viscosity
C. Kinematic viscosity
D. Density

945. In Biot number, the characteristic length used is the ratio of the _______________ of the solid?
A. Volume to surface area
B. Perimeter to surface area
C. Surface area to volume
D. Surface area to perimeter

946. Nusselt number is a function of Prandtl number and ______________ number of fluid in natural convection heat transfer?
A. Grashoff
B. Biot
C. Stanton
D. Reynolds

948. ______________ explains the mechanism of catalysis?
A. Activated complex theory
B. Collision theory
C. Thermodynamics
D. None of these

949. Which of the following factors control the design of a fluid-solid reactor ?
A. Reaction kinetics for single particle
B. Size distribution of solids being treated
C. Flow patterns of solids and fluid in the reactor
D. All A., B. and C.

950. If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship ?
A. t ∝ 1/an
B. t ∝ 1/an – 1
C. t ∝ 1/an + 1
D. t ∝ an

NOTE
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