Related Questions

In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter
A > 4 :1
B > 8:1
Liquid gradient over a tray can be minimised by
A Providing a higher skirt clearance or a higher weir
B Decreasing the number of rows of caps through which the liquid flows or by decreasing the velocity of liquid flow past the caps or by reducing the distance along the tray through which the liquid must flow
C Using split flow, radial flow or cascade flow for column diameter large than 4 ft
D All of the above
"Pushing an elemnt into stack already having five elements and stack size of 5, results in "
A "Overflow "
B "Crash"
C "Underflow"
D "User flow"
A special type of liquid transporting device is the diffuser pump, in which __________ are minimised.
A Bearing losses
B Disk friction
C Shock losses
D Cavitation
How are the efficiencies of any heat engine (miu) and reversible heat engine (miuR) compared, when both are operating between same heat source and same heat sink?
A miu = miuR
B miu>miuR
C miu
D none of these
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
A Finned tube heat exchanger with air inside and steam outside
B Finned tube heat exchanger with air outside and steam inside
C Shell and tube heat exchanger with air inside tubes and steam on shell side
D Shell and tube heat exchanger with air on shell side and steam inside tubes
Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.
A 1
B 7
C 18
D 26
In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
A Ostwald chart
B Cox chart
C Sankey diagram
D None of these

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