Mechanical Engineering MCQs

Page No. 167

Specific speed for reaction turbines ranges from___________________?


a0 to 4.5


b10 to 100


c80 to 200


d250 to 300


View Answer 10 to 100

Which place in hydraulic turbine is most susceptible for cavitation __________________?


ainlet of draft rube


bblade inlet


cguide blade


dpenstock


View Answer inlet of draft rube

According to fan laws, for fans having constant wheel diameter, the air or gas capacity varies______________________?


adirectly as fan speed


bsquare of fan speed


ccube of fan speed


dsquare root of fan speed


View Answer directly as fan speed

Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of__________________?


a39.2%


b49.2%


c68.8%


d84.8%


View Answer 84.8%

According to fan laws, for fans having constant wheel diameter, the pressure varies________________?


adirectly as fan speed


bsquare of fan speed


ccube of fan speed


dsquare root of fan speed


View Answer square of fan speed

Pressure intensifier increases the pressure in proportion to____________________?


aratio of diameters


bsquare of ratio of diameters


cinverse ratio of diameters


dsquare of inverse ratio of diameters



According to fan laws, at constant pressure, the speed capacity and power vary_________________?


adirectly as the air or gas density


binversely as square root of density


cinversely as density


das square of density



According to fan laws, for the fans having constant wheel diameters, the power demand varies_______________?


adirectly as fan speed


bsquare of fan speed


ccube of fan speed


dsquare root of fan speed


View Answer cube of fan speed

According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary________________?


adirectly as the air or gas density


binversely as square root of density


cinversely as density


das square of density


View Answer inversely as density

A hydraulic accumulator normally consists of________________?


atwo cylinders, two rams and a storage device


ba cylinder and a ram


ctwo co-axial rams and two cylinders


da cylinder, a piston, storage tank and control valve


View Answer a cylinder and a ram

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