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21. Multistage centrifugal pumps are used to obtain___________________?
A. high discharge
B. high head
C. pumping of viscous fluids
D. high head and high discharge
E. high efficiency
22. In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by_______________?
A. designing new impeller
B. trimming the impeller size to the required size by machining
C. not possible
D. some other alterations in the impeller
E. none of the above
23. One horsepower is equal to_________________?
A. 102 watts
B. 75 watts
C. 550 watts
D. 736 watts
E. 33000 watts
24. Axial flow pump is started with its delivery valve________________?
A. kept fully closed
B. kept fully open
C. irrespective of any position
D. kept 50% open
E. none of the above
25. Head developed by a centrifugal pump depends on___________________?
A. impeller diameter
B. speed
C. fluid density
D. type of casing
E. A. and B. above
26. In a centrifugal pump casing, the flow of water leaving the_______________?
A. radial
B. radial
C. centrifugal
D. rectilinear
E. vortex
27. Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of____________________?
A. high initial and maintenance cost
B. lower discharge
C. lower speed of operation
D. necessity of air vessel
E. all of the above
28. The efficiency of a centrifugal pump is maximum when its blades are__________________?
A. straight
B. bent forward
C. bent backward
D. bent forward first and then backward
E. bent backward first and then forward
29. When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be__________________?
A. horizontal
B. nearly horizontal
C. steep
D. first rise and then fall
E. none of the above
30. If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge_____________________?
A. same quantity of liquid
B. 0.75 Q
C. Q/0.75
D. 1.5 Q
E. none of the above