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Heat Transfer
Heat Transfer Interview
Quiz 1
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Q.1
From the concept of kinetic theory, mean travel velocity of the gas molecules is prescribed by the relation
a) V = (3M/GT) 1/2
b) V = (3GT/M) 1/2
c) V = (6T/GM) 1/2
d) V = (3GT/2M) 1/2
Q.2
Low temperature insulation are used when the enclosure is at a temperature lower than the ambient temperature. Which one of the following is not a low temperature insulation?
a) Asbestos
b) Cork
c) Cattle hair
d) Slag wool
Q.3
The value of Lorenz number in 10-8 W ohms/K2 is
a) 2.02
b) 2.35
c) 2.56
d) 2.45
Q.4
For liquids, thermal conductivity is governed by the relation
a) k = A c p p7/3/M1/3
b) k = 2A c p p4/3/M2/3
c) k = A c p p4/3/M1/3
d) k = A c p p8/3/M1/3
Q.5
Consider the following parameters
a) i and ii
b) i, ii, iii and iv
c) i and iii
d) i, ii and iii
Q.6
The thermal conductivity and the electrical conductivity of a metal at absolute temperature are related as
a) k/σ T
b) k/σ
c) k σ/T
d) k/T
Q.7
The relation Ϫ2 t =0 is referred to as
a) Poisson’s equation
b) Fourier heat conduction equation
c) Solution for transient conduction
d) Laplace equation
Q.8
The unit of thermal diffusivity is
a) m2/hr-K
b) kcal/m2-hr
c) m2/hr
d) m/hr-K
Q.9
To effect a bond between two metal plates, 2.5 cm andcm thick, heat is uniformly applied through the thinner plate by a radiant heat source. The bonding must be held atK for a short time. When the heat source is adjusted to have a steady value of 43.5 k W/ma thermocouple installed on the side of the thinner plate next to source indicates a temperature ofK. Calculate the temperature gradient for heat conduction through thinner plate. In the diagram, the upper plate is 2.5 cm thick while the lower iscm thick.
a) – 1000 degree Celsius/m
b) – 2000 degree Celsius/m
c) – 3000 degree Celsius/m
d) – 4000 degree Celsius/m
Q.10
The diffusion equations
a) Temperature doesn’t depends on time
b) There is no internal heat generation
c) Steady state conditions prevail
d) There is no internal heat generation but unsteady state condition prevails
0 h : 0 m : 1 s
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