Fluid Mechanics

641.Weber number is the ratio of inertial force to _________ force.

1. Surface tension
2. Gravity
3. Viscous
4. Elastic

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642.What causes cavitation in centrifugal pump?

1. High suction pressure
2. Low barometric pressure
3. Low suction pressure
4. High suction velocity

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643.What causes convective acceleration in fluid flow?

1. Steep slope in flow
2. Unsteady nature of flow
3. Non-uniformity of flow
4. Turbulence in flow

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644.What is the co-efficient of contraction, if a fluid jet discharging from a 50 mm diameter orifice has a 40 mm diameter at its vena-contracta?

1. 0.64
2. 1.65
3. 0.32
4. 0.94

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645.What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water interface? The balloon is of radius 0.1 m and is filled with air.

1. 4πg/3
2. 0.01 πgH/4
3. 0.01 πgH/8
4. 0.04 πgH/3

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646.What is the maximum theoretical suction lift (metres) of a reciprocating pump?

1. 5
2. 10
3. 50
4. 100

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647.What is the normal range of exit cone angle of a Venturimeter?

1. 2 to 5
2. 7 to 15
3. 15 to 25
4. >25

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648.What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir?

1. Penstock
2. Siphon
3. Tunnel
4. Pressure pipeline

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649.What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate?

1. 0.5
2. 1
3. 1.5
4. 2

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650.What is the ratio of fluid carrying capacity of two pipes having diameters d1 and d² respectively?

1. (d₁/d²)^0.8
2. (d₁/d²)^0.5
3. d₁/d²
4. (d₁/d²)²

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