Which of the following is the most widely used heat insulating material for pipelines carrying steam?
A) Tar dolomite bricks followed by asbestos
B) Fireclay refractory followed by aluminium sheet
C) Cotton followed by aluminium foil
D) 85% magnesia cement and glass wool
Correct Answer:
Verified
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
Q16: Thermal conductivity of a gas at low
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/?
Q22: Which area is used in case of
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