341. When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be _________________?
A. horizontal
B. nearly horizontal
C. steep
D. first rise and then fall
E. none of the above

342. 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

343. 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

344. One horsepower is equal to_________________?
A. 102 watts
B. 75 watts
C. 550 watts
D. 736 watts
E. 33000 watts

345. 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

346. 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

347. In a centrifugal pump casing, the flow of water leaving the_______________?
A. radial
B. radial
C. centrifugal
D. rectilinear
E. vortex

348. 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

349. 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

350. 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

NOTE
IF YOU THINK ANY OF THE MCQ ABOVE IS WRONG.
PLEASE COMMENT WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION IN COMMENT BOX.
THANK YOU

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