Fluid Mechanics

551.The pressure and power requirement of a gas fan at constant speed & capacity varies _________ the gas density.

1. Directly as
2. Inversely as square root of
3. Inversely as
4. As square of

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552.The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and

1. Moving
2. Static
3. Cold
4. Hot

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553.The pressure co-efficient is the ratio of pressure forces to _________ forces.

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

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554.The pressure drop per unit length of pipe incurred by a fluid 'X' flowing through pipe is Δp. If another fluid 'Y' having both the specific gravity & density just double of that of fluid 'X', flows through the same pipe at the same flow rate/average velocity, then the pressure drop in this case will be

1. Δp
2. 2Δp
3. Δp2
4. Δp/2

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555.The pressure head of a flow meter remains constant for

1. Venturimeter
2. Orificemeter
3. Rotameter
4. Pitot tube

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556.The pressure head on sudden contraction in a horizontal pipe is converted into the _________ head.

1. Elevation
2. Velocity
3. Both (A) & (B)
4. Neither (A) nor (B)

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557.The pressure intensity is the same in all directions at a point in a fluid

1. Only when the fluid is frictionless
2. Only when the fluid is at rest having zero velocity
3. When there is no motion of one fluid layer relative to an adjacent layer
4. Regardless of the motion of one fluid layer relative to an adjacent layer

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558.The pump impeller and the turbine runner in a hydraulic torque converter

1. Have the same diameter
2. Have different diameters
3. Are directly coupled
4. None of these

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559.The range of a particular Rotameter can be increased by

1. Use of floats of different densities
2. No means
3. Increasing the diameter of the float
4. Decreasing the diameter of the float

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560.The rate of change of moment of momentum represents the _________ by the fluid.

1. Torque applied
2. Force exerted
3. Work done
4. Power developed

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