Fluid Mechanics

701.Which of the following must be followed by the flow of a fluid (real or ideal)?
(I) Newton's law of viscosity.
(II) Newton's second law of motion.
(III) The continuity equation.
(IV) Velocity of boundary layer must be zero relative to boundary.
(V) Fluid cannot penetrate a boundary.

  1. I, II, III
  2. II, III, V
  3. I, II, V
  4. II, IV, V
Correct answer: (B)
II, III, V

702.Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump?

  1. Increasing the impeller speed and the volute area
  2. Increasing the number of vanes in the impeller
  3. Mounting of two or more impellers in series on a single shaft
  4. Either of (A), (B) or (C)
Correct answer: (C)
Mounting of two or more impellers in series on a single shaft

703.Which of the following pipe bends will incur the largest head loss?

  1. U-bend
  2. 30° bend
  3. 45° bend
  4. 90° bend
Correct answer: (A)
U-bend

704.Which of the following produces maximum pressure difference for transportation of gases?

  1. Vacuum pumps
  2. Blowers
  3. Fans
  4. Compressors
Correct answer: (D)
Compressors

705.Which of the following properties of a fluid is responsible for offering resistance to shear?

  1. Surface tension
  2. Viscosity
  3. Specific gravity
  4. All (A), (B), and (C)
Correct answer: (B)
Viscosity

706.Which of the following quantities are computed by using the hydraulic radius for noncircular ducts?

  1. Velocity and relative roughness
  2. Head loss and velocity
  3. Reynold number, relative roughness and head loss
  4. Reynolds number and friction factor
Correct answer: (C)
Reynold number, relative roughness and head loss

707.Which of the following relationship is valid for the equilibrium position of the float in a Rotameter? (Where, Dƒ= Drag force on the float Bƒ = Buoyant force on the float Wƒ = Weight of the float).

  1. Dƒ + Bƒ = Wƒ
  2. Dƒ = Bƒ + Wƒ
  3. Dƒ + Bƒ + Wƒ =0
  4. None of these
Correct answer: (A)

Dƒ + Bƒ = Wƒ

708.Which of the following two quantities when same, makes one pipe system equivalent to another pipe system?

  1. Head & discharge
  2. Length & discharge
  3. Length & diameter
  4. Friction factor & diameter
Correct answer: (A)
Head & discharge

709.Which of the following valves will incur maximum pressure drop for the same discharge of water?

  1. Globe valve
  2. Gate valve
  3. Needle valve
  4. Butterfly valve
Correct answer: (C)
Needle valve

710.While starting a centrifugal pump, its delivery valve should be kept

  1. Opened
  2. Closed
  3. Either opened or closed; it does not make any difference
  4. Either opened or closed; depending on the fluid viscosity
Correct answer: (B)
Closed
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