Fluid Mechanics

61. For measuring flow by a venturimeter, if should be installed in

  1. vertical line
  2. horizontal line
  3. inclined line with flow downward
  4. inclined line with upward flow
  5. in any direction and in any location.

Correct answer: (E)
in any direction and in any location.

62. For pipes, laminar flow occurs when Roynolds number is

  1. less than 2000
  2. between 2000 and 4000
  3. more than 4000
  4. less than 4000
  5. none of the above.

Correct answer: (A)
less than 2000

63. For pipes, turbulent flow occurs when Reynolds number is

  1. less than 2000
  2. between 2000 and 4000
  3. more than 4000
  4. less than 4000
  5. none of the above.

Correct answer: (C)
more than 4000

64. For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

  1. ratio of inertial force to force due to viscosity
  2. ratio of inertial force to force due to gravitation
  3. ratio of inertial force to force due to surface tension
  4. all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity
  5. none of the above.

Correct answer: (D)
all the four ratios of inertial force to force due to viscosity, gravitation, sur-face tension, and elasticity

65. For very great pressures, viscosity of moss gases and liquids

  1. remains same
  2. increases
  3. decreases
  4. shows erratic behavior
  5. none of the above.

Correct answer: (D)
shows erratic behavior

66. Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

  1. force of adhesion
  2. force of cohesion
  3. force of friction
  4. force of diffusion
  5. none of die above.

Correct answer: (B)
force of cohesion

67. Free surface of a liquid tends to contract to the smallest possible area due to force of

  1. surface tension
  2. viscosity
  3. friction
  4. cohesion
  5. adhesion.

Correct answer: (A)
surface tension

68. Froude number is significant in

  1. supersonics, as with projectile and jet propulsion
  2. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
  3. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
  4. all of the above
  5. none of the above

Correct answer: (C)
simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls

69. General energy equation holds for

  1. steady flow
  2. turbulent flow
  3. laminar flow
  4. non-uniform flow
  5. all of the above.

Correct answer: (D)
non-uniform flow

70. Gradually varied flow is

  1. steady uniform
  2. non-steady non-uniform
  3. non-steady uniform
  4. steady non-uniform
  5. true one-dimensional.

Correct answer: (D)
steady non-uniform

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