Fluid Mechanics

631.Venturimeters, orificemeters and nozzles are used to measure the fluid discharge from a pipeline. The average fluid velocity in a pipeline can be measured by a/an

  1. Weir
  2. Hot wire anemometer
  3. Cup and vane anemometer
  4. None of these
Correct answer: (B)
Hot wire anemometer

632.Very small pressure difference (< 5 mm water column) can be most conveniently measured by a/an _________ manometer.

  1. U-tube water
  2. U-tube mercury
  3. Inclined tube mercury
  4. Inclined tube water
Correct answer: (D)
Inclined tube water

633.Viscosity of water at 40°C lies in the range of

  1. 1 × 10-3 to 2 × 10-3 kg/m.s
  2. 0.5 × 10-3 to 1 × 10-3 kg/m.s
  3. 1 to 2 kg/m.s
  4. 0.5 to 1 kg/m.s
Correct answer: (B)

0.5 × 10-3 to 1 × 10-3 kg/m.s

634.Viscosity of water is about _________ times that of air at room temperature.

  1. 15
  2. 55
  3. 155
  4. 1050
Correct answer: (B)
55

635.Volume of liquid displaced by a floating body is equivalent to its

  1. Own weight
  2. Submerged weight
  3. Own volume
  4. Submerged volume
Correct answer: (A)
Own weight

636.Volute of a centrifugal pump should be designed in a fashion, such that the

  1. Kinetic head gets converted into static head
  2. Moving stream gradually reduces velocity
  3. Mean velocity remains constant
  4. None of these
Correct answer: (A)
Kinetic head gets converted into static head

637.Volute type of casing is provided in a centrifugal pump to

  1. Convert velocity head to pressure head
  2. Convert pressure head to velocity head
  3. Reduce the discharge fluctuation
  4. Increase the discharge
Correct answer: (D)
Increase the discharge

638.Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an

  1. Pitot tube
  2. Venturimeter
  3. Orificemeter
  4. Rotameter
Correct answer: (A)
Pitot tube

639.Water hammer in a pipeline results from the

  1. Bursting of pipelines due to closure by a valve
  2. Rapid pressure change due to a rapid change in the rate of flow
  3. Pressure increase due to closure of a valve resulting in decrease in rate of flow
  4. None of these
Correct answer: (B)
Rapid pressure change due to a rapid change in the rate of flow

640.Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the

  1. Pipe length
  2. Fluid velocity in the pipe
  3. Time taken to close the valve
  4. All (A), (B) and (C)
Correct answer: (D)
All (A), (B) and (C)
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