Mechanical Engineering Objective Questions { Hydraulic Fluid Mechanics }

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239. The discharge through an orifice fitted in a tank can be increased by

A. Fitting a short length of pipe to the outside

B. Sharpening the edges of orifice

C. Fitting a long length of pipe to the outside

D. Fitting a long length of pipe to the inside

240. When the depth of water in an open channel is greater than the critical depth then flow is said to be

241. When the depth of water in an open channel is less than the critical depth, then flow is said to be

242. The hydraulic grade line is

A. Always moving up

B. Always moving down

C. Always above the energy grade line

D. The velocity head below the energy grade line

243. The rise of liquid along the walls of a revolving cylinder above the initial level

A. Is greater than the depression of the liquid at the axis of rotation

B. Is lesser than the depression of the liquid at the axis of rotation

C. Is the same as the depression of the liquid at the axis of rotation

D. It depends upon the magnitude of speed

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

A. Increases linearly as its radial distance

B. Varies inversely as the altitud'2 along any vertical line

C. Varies as the square of the radial distance

D. Decreases as the square of radial distance

245. Total pressure on the top of a closed cylindrical vessel completely filled with

A. Liquid, is directly proportional to

C. (b) (radius)2

D. (c) (radius)3

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