HYDRAULICS AND FLUID MECHANICS IN ME QUIZ

In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

Four times

Sixteen times

Double

Eight times

TRUE ANSWER : ?
YOUR ANSWER : ?

Low specific speed of turbine implies it is

Any one of the above

Propeller turbine

Francis turbine

Impulse turbine

TRUE ANSWER : ?
YOUR ANSWER : ?

Liquids

Cannot be compressed

Occupy definite volume

Are not affected by change in pressure and temperature

None of the listed here

TRUE ANSWER : ?
YOUR ANSWER : ?

A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit discharge of wheel is

2.5 m3/s

0.25 m3/s

1.5 m3/s

0.5 m3/s

TRUE ANSWER : ?
YOUR ANSWER : ?

The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is _______ of the jet velocity,

One-half

Double

Three-fourth

One-fourth

TRUE ANSWER : ?
YOUR ANSWER : ?

Euler's number is the ratio of __________ force to pressure force.

Viscous

Inertia

Gravity

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The total energy line lies over the hydraulic gradient line by an amount equal to the

Velocity head

Pressure head - velocity head

Pressure head + velocity head

Pressure head

TRUE ANSWER : ?
YOUR ANSWER : ?

The value of coefficient of discharge is __________ the value of coefficient of velocity.

Same as

Less than

More than

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Euler's equation in the differential form for the motion of liquids is given by

dp/ρ + g.dz + v.dv = 0

ρ.dp - g.dz + v.dv = 0

ρ.dp + g.dz + v.dv = 0

dp/ρ - g.dz + v.dv = 0

TRUE ANSWER : ?
YOUR ANSWER : ?

A turbine is required to develop 1500 kW at 300 r.p.m. under a head of 150 m. Which of the following turbine should be used?

Pelton wheel with one nozzle

Kaplan turbine

Pelton wheel with two or more nozzles

Francis turbine

TRUE ANSWER : ?
YOUR ANSWER : ?

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