Mechanical Engineering MCQs

Page No. 171

Head developed by a centrifugal pump depends on___________________?


aimpeller diameter

✖


bspeed

✖


cfluid density

✖


dA. and B. above

✓


View Answer A. and B. above

Axial flow pump is started with its delivery valve________________?


akept fully closed

✖


bkept fully open

✓


cirrespective of any position

✖


dkept 50% open

✖


View Answer kept fully open

One horsepower is equal to_________________?


a102 watts

✖


b75 watts

✖


c550 watts

✖


d736 watts

✓


View Answer 736 watts

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


adesigning new impeller

✖


btrimming the impeller size to the required size by machining

✓


cnot possible

✖


dsome other alterations in the impeller

✖



Multistage centrifugal pumps are used to obtain___________________?


ahigh discharge

✖


bhigh head

✓


cpumping of viscous fluid

✖


dhigh head and high discharge

✖


View Answer high head

When a piping system is made up primarily of vertical lift and very little pipe friction, the pump characteristics should be _________________?


ahorizontal

✖


bnearly horizontal

✖


csteep

✓


dfirst rise and then fall

✖


View Answer steep

Centrifugal pump is started with its delivery valve __________________?


akept fully closed

✓


bkept fully open

✖


cirrespective of any position

✖


dkept 50% open

✖


View Answer kept fully closed

For starting an axial flow pump, its delivery valve should be____________________?


aclosed

✖


bopen

✓


cdepends on starting condition and flow desired

✖


dcould be either open or closed

✖


View Answer open

The operation of straightening a curved sheet metal, is known as____________________?


asqueezing

✖


bcoining

✖


cplanishing

✓


ddrawing

✖


View Answer planishing

Tandem drawing of wires and tubes is necessary because_________________?


aaccuracy in dimensions is not possible otherwise

✖


bsurface finish improves after every drawing stage

✖


cit is not possible to reduce at one stage

✖


dannealing is needed between stages

✓



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