Fluid Mechanics

461.The buoyant force acting on a floating body is dependent on the

1. Viscosity of the liquid
2. Weight of the liquid displaced
3. Depth of immersion of the body
4. Surface tension of the liquid

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462.The capacity of a centrifugal pump Can be increased by increasing the

1. Impeller diameter or speed
2. Number of pumps and joining them in series
3. Number of pumps and joining them in parallel
4. All (A), (B) and (C)

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463.The capacity of an accumulator is the maximum

1. Energy which it can store
2. Discharge which it can deliver
3. Liquid which it can store
4. None of these

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464.The capillary rise of mercury is maximum in glass tube of dia _________ mm.

1. 0.5
2. 1
3. 2
4. 5

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465.The centre of pressure is

1. Always below the centroid of the area
2. Always above the centroid of the area
3. A point on the line of action of the resultant force
4. At the centroid of the submerged area

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466.The co-efficient of discharge of an orificemeter is a function of

1. Reynolds number at the orifice
2. Ratio of orifice dia to pipe dia
3. Both (A) and (B)
4. None of the above parameters, and has a constant value of 0.61

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467.The co-efficient of drag and lift for an incompressible fluid depends on the

1. Reynolds number
2. Froude number
3. Mach number
4. All (A), (B) and (C)

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468.The component of acceleration resulting due to unsteady nature of flow is called _________ acceleration.

1. Normal
2. Local
3. Convective
4. Tangential

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469.The continuity equation

1. Relates mass flow rate along a stream tube
2. Relates work and energy
3. Stipulates that Newton's second law of motion must be satisfied at every point in the fluid
4. None of these

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470.The continuity equation in ideal fluid flow states that

1. Net rate of inflow into any small volume must be zero
2. Energy is not constant along a streamline
3. Energy is constant along a streamline
4. There exists a velocity potential

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