Mechanical Engineering MCQs

Page No. 170

For small discharge at high pressure, following pump is preferred_____________________?


acentrifugal

✖


baxial flow

✖


cmixed flow

✖


dreciprocating

✓


View Answer reciprocating

Low specific speed of a pump implies it is____________________?


acentrifugal pump

✓


bmixed flow pump

✖


caxial flow pump

✖


dany one of the above

✖


View Answer centrifugal pump

In a centrifugal pump, the liquid enters the pump__________________?


aat the top

✖


bat the bottom

✖


cat the center

✓


dfrom sides

✖


View Answer at the center

In centrifugal pumps, maximum efficiency is obtained when the blades are_________________?


astraight

✖


bbent forward

✖


cbent backward

✓


dradial

✖


View Answer bent backward

The optimum value of vane exit angle for a centrifugal pump impeller is_________________?


a10-15°

✖


b20-25°

✓


c30-40°

✖


d50-60°

✖


View Answer 20-25°

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_____________________?


asame quantity of liquid

✓


b0.75 Q

✖


cQ/0.75

✖


d1.5 Q

✖



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


ahorizontal

✖


bnearly horizontal

✓


csteep

✖


dfirst rise and then fall

✖


View Answer nearly horizontal

The efficiency of a centrifugal pump is maximum when its blades are__________________?


astraight

✖


bbent forward

✖


cbent backward

✓


dbent forward first and then backward

✖


View Answer bent backward

Reciprocating pumps are no more to be seen in industrial applications (in comparison to centrifugal pumps) because of____________________?


ahigh initial and maintenance cost

✓


blower discharge

✖


clower speed of operation

✖


dnecessity of air vessel

✖



In a centrifugal pump casing, the flow of water leaving the_______________?


aradial

✖


bcentrifugal

✖


crectilinear

✖


dvortex

✓


View Answer vortex

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