225. The amount of blowdown water wasted in cooling towers depends on
A.Overflow to the towers
B.Weather conditions
C.Load on the tower
D.Hardness of the circulating water
226. Delignification (eating up of wood) in cooling tower is controlled by
A.Controlling blowdown to keep the concentration of soluble and scale forming solids below a limit
B.Softening the make up water with lime and soda ash, zeolite or some of the several phosphates
C.Adjusting pH between 7 to 7.5
D.Adding chlorine, copper sulphate, potassium permanganate etc. to the circulating water
227. In cooling tower, water is cooled by the process of
A.Condensation
B.Fusion
C.Evaporation
D.Sublimation
228. Filling or decking in a cooling tower increases the rate of heat transfer by providing
A.Increased flow of water
B.Increased flow or air
C.Increased flow of water and air
D.A large amount of wetted surface
229. In an evaporative condenser, the rate at which the water evaporates depends upon the
A.Dry bulb temperature
B.Wet bulb temperature
C.Sensible heat
D.All of the above
230. Algae formation in cooling tower is controlled by
A.Controlling blowdown to keep the concentration of soluble and scale forming solids below a limit
B.Softening the make up water with lime and soda ash, zeolite or some of the several phosphates
C.Adjusting pH between 7 to 7.5
D.Adding chlorine, copper sulphate, potassium permanganate etc. to the circulating water
231. Cooling towers generally employ
A.Single speed fan drive
B.Two speed fan drives
C.Mulit-speed fan drives in steps
D.Infinitely variable multi-speed fan drives
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