The main draw-back of centrifugal pump, is necessity of priming discharge from p

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Question
The main draw-back of centrifugal pump, is
Options
A. necessity of priming
B. discharge from pump varies with the load of water
C. for high heads, efficiency is low up to 50%
D. the suction lift is limited to 6 m
E. all the above.

Correct Answer

all the above.

Water Supply Engineering problems

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1. Disinfection of water with ozone is not good because
Options
A. it vanishes before water reaches the consumers
B. it removes the colour, taste and odour from water as bacterias
C. it adds taste to the water
D. it is more efficient than chlorine in killing bacterias
E. none of these.

3. Pick up the correct statement from the following :
Options
A. The internal pressure within a pipe, is caused due to water head and hammer pressure
B. The internal pressure in a pipe running full is equal to vertical ordinate between hydraulic gradient line and centre of the pipe
C. In pressure pipes with water at rest, the pressure is equal to water head
D. Sudden closure of a valve, causes the water hammer pressure
E. All the above.

6. The equation in which Q is yearly run off in cm, P is yearly total rainfall in cm, H is difference of R.L.s. of lowest and highest points and A is area of catchment in square metres, is known as
Options
A. English formula
B. Khosla's formula
C. Justin's formula
D. Vermule's formula.

7. A pressure conduit laid under ground, may not be subjected to
Options
A. internal pressure of water
B. pressure due to external load
C. longitudinal temperature stress
D. longitudinal stresses due to unbalanced pressure to bends
E. none of these.

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