Related Questions

Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan
A With greater number of blades
B Of increased diameter
C Both A & B
D Neither A nor B
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
Evaporative cooling process employs a combination of cooling and humidification in which the
A Sensible heat is added
B Sensible heat is removed and the latent heat is added
C Latent heat is removed
D Sensible heat is added and latent heat is removed
________ cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall
A Direct
B Indirect
C Conventional
D Any of the above
The cooling effect in a cooling tower can not be increased by
A Increasing the air velocity over the wet surfaces
B Reducing the humidity of entering air
C Lowering the barometric pressure
D None of these
Gas cooling as compared to water cooling of nuclear reactors
A Can not attain a high temperature
B Is more efficient as gas has a higher specific heat
C Can produce only saturated steam for feeding to power turbine
D None of these
The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called
A Condenser efficiency
B Vacuum efficiency
C Nozzle efficiency
D Boiler efficiency
Transformers with a capacity of up to _____ have a cooling radiator system with natural cooling
A 2 MVA
B 5 MVA
C 7.5 MVA
D 10 MVA
In self cooled motors the cooling time constant is about ______ than the heating time constant because cooling conditions are worse at standstill.
A 2 to 3 times greater
B 3 to 4 times greater
C 4 to 5 times greater
D none of the above
The term "cooling range" in a cooling tower refers to the difference in the temperature of
A Cold water leaving the tower and the wet bulb temperature of the surrounding air
B Hot water entering the tower and the wet bulb temperature of the surrounding air
C Hot water entering the tower and the cooled water leaving the tower
D None of these

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