_______________ paint has the maximum absorption coefficient ?
_______________ paint has the maximum absorption coefficient ?
A. Black
B. Yellow
C. White
D. Grey
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For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would ?
For a given ambient air temperature with increase in the thickness of insulation of a hot cylindrical pipe, the rate of heat loss from the surface would ?A. Decrease
B. Increase
C. First decrease and then increase
D. First increase and then decreaseIn case of a multipass shell and tube heat exchanger, providing a baffle on the shell side ______________ the heat transfer rate?
In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side ______________ the heat transfer rate?A. Increases
B. Decreases
C. Does not affect
D. May increase or decrease, depends on the type of baffleFor turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus- Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of________________?
For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus- Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of________________?A. 1
B. 1.74
C. 6.1
D. 37In a single evaporator system, the steam economy ________________ by creating vacuum in the evaporator?
In a single evaporator system, the steam economy ________________ by creating vacuum in the evaporator?A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease, depends on the vacuumRadiation heat losses from satisfactorily insulated high pressure boiler may be about _____________ percent?
Radiation heat losses from satisfactorily insulated high pressure boiler may be about _____________ percent?A. 1
B. 7
C. 18
D. 26The Graetz number is concerned with the___________________
The Graetz number is concerned with the___________________A. Mass transfer between a gas and a liquid
B. Absorption with chemical reaction
C. Heat transfer in turbulent flow
D. Heat transfer in laminar flow