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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