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Heat Transfer - Interview Questions and Answers

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31. LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is
A. higher
B. lower
C. same
D. depends on the area of heat exchanger
E. depends on temperature conditions.
Explanation:
32. Thermal diffusivity is
A. a dimensionless parameter
B. function of temperature
C. used as mathematical model
D. a physical property of the material
E. useful in case of heat transfer by radiation.
Explanation:
33. Unit of thermal diffusivity is
A. m2/hr
B. m2/hr�C
C. kcal/m2 hr
D. kcal/m.hr�C
E. kcal/m2 hr�C.
Explanation:
34. Heat transfer takes place as per -
A. zeroth law of thermodynamics
B. first law of thermodynamic
C. second law of the thermodynamics
D. Kirchhoff law (e) Stefan's law.
E. opt 5
Explanation:
35. The ratio of heat flow Q1/Q2 from two walls of same thickness having their thermal conductivities as ATj - 2K2 will be
A. I
B. 0.5
C. 2
D. 0.25
E. 4.0
Explanation:
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