Mechanical Engineering MCQs

Page No. 168

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


a39.2%


b49.2%


c68.8%


d84.8%


View Answer 39.2%

Puck up the wrong statement about centrifugal pump_______________?


adischarge a diameter


bhead a speed2


chead a diameter


dPower a speed3


View Answer discharge a diameter

Hydraulic accumulator is used for____________________?


aaccumulating oil


bsupplying large quantities of oil for very short duration


cgenerally high pressures to operate hydraulic machines


dsupplying energy when main supply fails



A hydraulic intensifier 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



Maximum impulse will be developed in hydraulic ram when ___________________?


awaste valve closes suddenly


bsupply pipe is long


csupply pipe is short


dram chamber is large



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


adirectly as the air or gas density


binversely as square root of density


cinversely as density


das square of density



Air vessels in reciprocating pump are used to__________________?


asmoothen flow


breduce acceleration to minimum


cincrease pump efficiency


dsave pump from cavitation



In axial flow fans and turbines, fluid enters and leaves as follows________________?


aradially, axially


baxially, radially


caxially, axially


dradially, radially


View Answer axially, axially

The angle of taper on draft tube is A. greater than 15° B. greater than 8° C. greater than 5° D. less than 8° E. less than 3°.___________________? The angle of taper on draft tube is


agreater than 15°


bgreater than 8°


cgreater than 5°


dless than 8°


View Answer less than 8°

Reaction turbines are used for____________________?


alow head


bhigh head


chigh head and low discharge


dlow head and high discharge



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