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Hydraulics and Fluid Mechanics

61.

A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury?

Answer: C

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62.

When a plate is immersed in a liquid parallel to the flow, it will be subjected to a pressure __________ that if the same plate is immersed perpendicular to the flow.

Answer: D

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63.

The tendency of a liquid surface to contract is due to the following property

Answer: D

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64.

The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

Answer: D

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Answer: D

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66.

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

Answer: A

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67.

The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is

Answer: A

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68.

When a body floating in a liquid, is displaced slightly, it oscillates about

Answer: D

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Answer: D

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Answer: A

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