Related Questions

Indirect contact heat exchangers are preferred over direct contact heat exchangers, because
A Heat transfer co-efficient are high
B There is no risk of contamination
C There is no mist formation
D Cost of equipment is lower
Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
A Wet bulb
B Dry bulb
C Saturation
D Dew point
High noise levels produced during operation of fans and compressors can be reduced by using
A Mufflers (silencers)
B Accoustical absorbent
C Lagging of noisy duct
D None of these
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
The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.
A Ambient
B Dry bulb
C Dew point
D Wet bulb
The temperature of water cooled in cooling tower is always __________ temperature of entering air.
A More than the wet bulb
B Less than the wet bulb
C Equal to the wet bulb
D Equal to the dry bulb
According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies
A Directly as fan speed
B Square of fan speed
C Cube of fan speed
D Square root of fan speed
In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.
A Molal flow rate of vapour
B Vapour molecular weight
C Pressure and temperature
D All of the above
For the same draught produced the power of induced draught fan as compared to forced draught fan is
A less
B more
C same
D not predictable
The minimum temperature to which water can be cooled in a cooling tower is
A Dew point temperature of air
B Wet bulb temperature of air
C Dry bulb temperature of air
D Ambient air temperature

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