Film condensation is promoted on a/an _______________________ surface?
Film condensation is promoted on a/an _______________________ surface?
A. Oily
B. Coated
C. Clean & smooth
D. Dirty
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The 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 flowWhat is the absorptivity of a black body?
What is the absorptivity of a black body?A. 1
B. 0
C. 0.78
D. 0.95A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be__________________?
A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be__________________?A. Greater than that for un-insulated steam pipe
B. Less than that of the un-insulated steam pipe
C. Equal to that of the un-insulated steam pipe
D. Less than the steam pipe with 5 cms insulationCirculation pump is located below the evaporator to___________________?
Circulation pump is located below the evaporator to___________________?A. Avoid cavitation
B. Avoid frequent priming
C. Create more suction head
D. None of theseAbsorptivity and reflectivity of a perfect black body are respectively _______________?
Absorptivity and reflectivity of a perfect black body are respectively _______________?A. 1 and 0
B. 0 and 1
C. 1 and ∞
D. 0 and 0.5Heat produced when a steady state current, I passes through an electrical conductor having resistance, ‘R’ is___________________?
Heat produced when a steady state current, I passes through an electrical conductor having resistance, ‘R’ is___________________?A. IR
B. I2R
C. IR2
D. I2R2