Hydraulics and Fluid Mechanics - Mechanical Engineering Questions and Answers

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The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

1/2 × depth

1/2 × breadth

1/2 × sloping side

1/4 × (depth + breadth)

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The pressure of liquid at throat in a Venturimeter is __________ than that at inlet.

Higher

Lower

Same

None of these

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A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

Increase

Decrease

Remain same

Increase/decrease depending on depth of immersion

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Fluid is a substance which offers no resistance to change of

Pressure

Flow

Shape

Volume

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

Directly as the air or gas density

Inversely as square root of density

Inversely as density

As square of density

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For centrifugal pump impeller, the maximum value of the vane exit angle is

10° to 15°

15° to 20°

20° to 25°

25° to 30°

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A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

14π R1/2/15Cd × a √(2g)

14π R3/2/15Cd × a √(2g)

14π R5/2/15Cd × a √(2g)

14π R7/2/15Cd × a √(2g)