Thermal conductivity of a gas at low density, __________ with increase in temperature.
A) Decreases
B) Increases
C) Remains unchanged
D) May increase or decrease; depends on the gas
Correct Answer:
Verified
Q11: Critical value of the _ number governs
Q12: Prandtl number is the reciprocal of
A)Thermal diffusivity/Momentum
Q13: In case of parallel flow heat exchanger,
Q14: For a multipass shell and tube heat
Q15: Evaporator tubes are generally
A)Horizontal
B)Vertical
C)Inclined
D)Random
Q17: Which of the following is the most
Q18: The interchange factor for radiation heat transfer
Q19: If the thermal conductivity of a wall
Q20: With increase in temperature, the thermal conductivity
Q21: Grashoff number is given by
A)gD3.?.?t?2/?2
B)gD2??t?/?2
C)gD2??tP2?
D)gD3??tP2/?
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