Dropwise condensation is promoted on a/an ______________ surface?
Dropwise condensation is promoted on a/an ______________ surface?
A. Glazed
B. Oily
C. Coated
D. Smooth
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The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co-efficient at this time is _____________________?
The overall heat transfer co-efficient for a shell and tube heat exchanger for clean surfaces is U0 = 400 W/m2.K. The fouling factor after one year of operation is found to be hd0 = 2000 W/m2.K. The overall heat transfer co-efficient at this time is _____________________?A. 1200 W/m2.K
B. 894 W/m2.K
C. 333 W/m2.K
D. 287 W/m2.KIn a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will___________________?
In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will___________________?A. Increase
B. Decrease
C. Remain unchanged
D. Either increase or decrease; depends on the coolant flow rateThe steam ejector is used to__________________?
The steam ejector is used to__________________?A. Remove condensate from the steam pipelines
B. Create vacuum
C. Superheat the steam
D. None of theseBaffles in the shell side of a shell and tube heat exchanger ?
Baffles in the shell side of a shell and tube heat exchanger ?A. Increase the cross-section of the shell side liquid
B. Force the liquid to flow parallel to the bank
C. Increase the shell side heat transfer co-efficient
D. Decrease the shell side heat transfer co-efficientFor specified tube outside diameter, higher BWG means higher___________________?
For specified tube outside diameter, higher BWG means higher___________________?A. Tube thickness
B. Cross-sectional area
C. Weight per unit length
D. None of theseIn a gas-liquid shell and tube heat exchanger, the_________________?
In a gas-liquid shell and tube heat exchanger, the_________________?A. Presence of a non-condensable gas decreases the condensing film co-efficient
B. Gases under high pressure are routed through the tube side, because high pressure gases are
corrosive in nature
C. Gases to be heated/cooled is normally routed through the shell side, because the corrosion
caused by the cooling water or steam condensate remain localised to the tubes
D. All A, B. & C.