Hydraulics and Fluid Mechanics in ME - 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

A.

1/2 × depth

B.

1/2 × breadth

C.

1/2 × sloping side

D.

1/4 × (depth + breadth)

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

A.

Higher

B.

Lower

C.

Same

D.

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

A.

Increase

B.

Decrease

C.

Remain same

D.

Increase/decrease depending on depth of immersion

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Fluid is a substance which offers no resistance to change of

A.

Pressure

B.

Flow

C.

Shape

D.

Volume

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

A.

Directly as the air or gas density

B.

Inversely as square root of density

C.

Inversely as density

D.

As square of density

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

A.

10° to 15°

B.

15° to 20°

C.

20° to 25°

D.

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

A.

14π R1/2/15Cd × a √(2g)

B.

14π R3/2/15Cd × a √(2g)

C.

14π R5/2/15Cd × a √(2g)

D.

14π R7/2/15Cd × a √(2g)