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%

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c68.8%

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d84.8%

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View Answer 39.2%

Puck up the wrong statement about centrifugal pump_______________?


adischarge a diameter

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bhead a speed2

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chead a diameter

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dPower a speed3

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View Answer discharge a diameter

Hydraulic accumulator is used for____________________?


aaccumulating oil

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bsupplying large quantities of oil for very short duration

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cgenerally high pressures to operate hydraulic machines

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dsupplying energy when main supply fails

✓



A hydraulic intensifier normally consists of __________________?


atwo cylinders, two rams and a storage device

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ba cylinder and a ram

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ctwo co-axial rams and two cylinders

✓


da cylinder, a piston, storage tank and control valve

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Maximum impulse will be developed in hydraulic ram when ___________________?


awaste valve closes suddenly

✓


bsupply pipe is long

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csupply pipe is short

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dram chamber is large

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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

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cinversely as density

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das square of density

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Air vessels in reciprocating pump are used to__________________?


asmoothen flow

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breduce acceleration to minimum

✓


cincrease pump efficiency

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dsave pump from cavitation

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


aradially, axially

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baxially, radially

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caxially, axially

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dradially, radially

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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°

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bgreater than 8°

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cgreater than 5°

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dless than 8°

✓


View Answer less than 8°

Reaction turbines are used for____________________?


alow head

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bhigh head

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chigh head and low discharge

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dlow head and high discharge

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