What is the unit of thermal conductivity ?
What is the unit of thermal conductivity ?
A. Kcal/hr. m2 °C
B. Kcal/hr.m.°C
C. Kcal/hr.m
D. Kcal/hr. °C
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For an ideal black body______________________?
For an ideal black body______________________?A. Absorptivity = 1
B. Reflectivity = 1
C. Emissivity = 0
D. Transmissivity = 1jH factor for heat transfer is not a function of the _______________ number?
jH factor for heat transfer is not a function of the _______________ number?A. Reynolds
B. Nusselt
C. Grashoff
D. Both B. & C.Which of the following has the lowest overall heat transfer co-efficient ?
Which of the following has the lowest overall heat transfer co-efficient ?A. Dowtherm
B. Molten sodium
C. Water
D. AirWhich of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger ?
Which of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger ?A. Corrosiveness & fouling characteristics
B. Pressure
C. Viscosity
D. DensityHeat exchanger tubes are never made of_________________?
Heat exchanger tubes are never made of_________________?A. Plain carbon steel
B. Stainless steel
C. Lead
D. CopperThe separation of liquid droplets from the vapor is done by a/an _____________ in the evaporators?
The separation of liquid droplets from the vapor is done by a/an _____________ in the evaporators?A. Steam ejector
B. Entrainment separator
C. Compressor
D. Vacuum pump