Fluid Mechanics

191. 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.

Correct answer: (D)
the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

192. 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.

Correct answer: (A)
friction loss and flow

193. 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.

Correct answer: (C)
size and shape of the cross section in a particular length remain constant

194. 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.

Correct answer: (C)
both of the above

195. Viscosity of water in comparison to mercury is

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

Correct answer: (A)
higher

196. 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.

Correct answer: (D)
metacentre

197. 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.

Correct answer: (D)
uniform

198. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea

  1. Venturimeter
  2. Orifice plate
  3. hot wire anemometer
  4. rotameter
  5. pitot tube.

Correct answer: (E)
pitot tube.

199. Which of the following instrument can be used for measuring speed of an aeroplane

  1. Venturimeter
  2. Orifice plate
  3. hot wire anemometer
  4. rotameter
  5. pitot tube.

Correct answer: (E)
pitot tube.

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.

Correct answer: (E)
all of the above.

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