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.
Correct Answer:
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Q9: Moisture would find its way into insulation
Q10: Heat is transferred by all three modes
Q11: According to Prevost theory of heat exchange
A)it
Q12: The ratio of heat flow Q1/Q2 from
Q13: Heat transfer by radiation mainly depends upon
A)its
Q15: Thermal diffusivity of a substance is .
A)proportional
Q16: 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.
Q17: Thermal conductivity of wood depends on
A)moisture
B)density
C)temperature
D)all of
Q18: In convection heat transfer from hot flue
Q19: Film coefficient is defined as Inside diameter
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