10) Multistage centrifugal pumps are used to obtain

high discharge

high head

pumping of viscous fluids

high head and high discharge

Answer is:

high head

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11) When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

horizontal

nearly horizontal

steep

first rise and then fall

Answer is:

nearly horizontal

12) In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

designing new impeller

trimming the impeller size to the required size by machining

not possible

some other alterations in the impeller

Answer is:

trimming the impeller size to the required size by machining

13) 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

same quantity of liquid

0.75 Q

Q/0.75

1.5 Q

Answer is:

same quantity of liquid

14) The horse power required in above case will be

same

0.75 B.H.P.

B.H.P./0.75

1.5 B.H.P.

Answer is:

0.75 B.H.P.

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10) Multistage centrifugal pumps are used to obtain

high head

Theory of Machines MCQ with Answers

Related Theory of Machines MCQ with Answers

11) When a piping system is made up primarily of friction head and very little of vertical lift, then pump characteristics should be

nearly horizontal

12) In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

trimming the impeller size to the required size by machining

13) 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

same quantity of liquid

14) The horse power required in above case will be

0.75 B.H.P.

Theory of Machines MCQ with Answers