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Mechanical Engineering Objective Questions { Hydraulic Machines }



1. In a single casing, multi-stage 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

2. 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

3. Multistage centrifugal pumps are used to obtain
A.High discharge
B.High head
C.Pumping of viscous fluids
D.High head and high discharge

4. In a centrifugal pump casing, the flow of water leaving the
A.Radial
B.Vortex
C.Centrifugal
D.Rectilinear

5. One horsepower is equal to
A.102 watts
B.75 watts
C.550 watts
D.735 watts

6. 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

7. 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

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