Mechanical Engineering Objective Questions { Hydraulic Fluid Mechanics }

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274. When a liquid rotates at constant angular velocity about a vertical axis as a rigid body, the pressure

A. Varies as the square of the radial distance

B. Decreases as the square of the radial distance

C. Increases linearly as the radial distance

D. Varies inversely as the elevation along any vertical line

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275. In a free vortex motion

A. Rotation of fluid, moving as a solid, takes place about an axis

B. Each particle moves' in a circular path with a speed varying inversely as the distance from the centre

C. Velocity decreases with the radius

D. Velocity remains constant

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276. The critical velocity as

A. Maximum attainable velocity

B. Terminal velocity

C. Velocity when hydraulic jump occurs

D. Velocity above which the flow ceases to be streamlined

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277. The rise of-liquid along the walls of a revolving cylinder as compared to depression at the centre w.r.t. initial level is

D. More/less depending on speed

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278. In a forced-vortex motion

A. Rotation of fluid, moving as a solid, takes place about an axis

B. Each particle moves in a circular path with a speed varying inversely as the distance from the centre

C. Velocity decreases with the radius

D. Velocity remains constant

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279. When a fluid flows in concentric circles, it is known as

A. Free circular motion

B. Free rotational motion

C. Free spiral vortex flow

D. Free cylindrical vortex flow

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280. A right-circular cylinder open at top is filled with water and rotated about its vertical axis at such speed that half the liquid spills out. The pressure at centre of bottom is

A. One half its value when cylinder was full

B. One fourth its value when cylinder was full

D. Can't be determined due to insufficient data

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