Fluid Mechanics

191. Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be

1. 1000 kg
2. 4000 kg
3. 2000 kg
4. 8000 kg
5. 16000 kg.

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192. True one-dimensional flow occurs when

1. the direction and magnitude of the veiocity at all points are identical
2. the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
3. the magnitude and direction of the velocity do not change from point to point in the fluid
4. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
5. velocity, depth, pressure etc. change from point to point in the fluid flow.

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193. Two dimensional flow occurs when

1. the direction and magnitude of the velocity at all points are identical
2. the velocity of successive fluid particles, at any point, is the same at successive periods of time
3. the magnitude and direction of the velocity do not change from point to point in the fluid
4. the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
5. velocity, depth, pressure, etc. change from point to point in the fluid flow.

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194. Two pipe systems can be said to be equivalent, when the following quantites are same

1. friction loss and flow
2. length and diameter
3. flow and length
4. friction factor and diameter
5. velocity and diameter.

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195. Uniform flow occurs when

1. the flow is steady
2. the flow is streamline
3. size and shape of the cross section in a particular length remain constant
4. size and cross section change uniformly along length
5. flow occurs at constant fate.

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196. Units of surface tension are

1. energy/unit area
2. distance
3. both of the above
4. it has no units
5. none of the above.

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197. Viscosity of water in comparison to mercury is

1. higher
2. lower
3. same
4. higher/lower depending on temperature
5. unpredictable.

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

1. e.g. of body
2. center of pressure
3. center of buoyancy
4. metacentre
5. liquid surface.

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199. When the flow parameters at any given instant remain same at every point, then flow is said to be

1. quasi static
2. steady state
3. laminar
4. uniform
5. static.

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200. Which of the following instruments is used to measure flow on the application of Bernoulli's theorem

1. Venturimeter
2. Orifice plate
3. nozzle
4. pitot tube
5. all of the above.

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