Fluid Mechanics

41.A mixed flow centrifugal pump

  1. Employs such an impeller, through which the flow is a combination of radial & axial flow
  2. Mixes the two fluids before pumping them
  3. Pumps the two fluids separately and then mixes them
  4. Employs impellers in both the radial & axial directions
Correct answer: (A)
Employs such an impeller, through which the flow is a combination of radial & axial flow

42.A mono pump is a _________ pump.

  1. Centrifugal
  2. Piston
  3. Positive acting rotary
  4. A group of vacuum
Correct answer: (C)
Positive acting rotary

43.A Newtonian fluid is that

  1. Which follows Newton's law of motion
  2. Which needs a minimum shear, before it starts deforming
  3. For which shear & deformation are related as T = μ (∂u/∂y)
  4. None of these
Correct answer: (C)
For which shear & deformation are related as T = μ (∂u/∂y)

44.A Newtonian liquid (ρ = density, μ = viscosity) is flowing with velocity „v‟ in a tube of diameter 'D'. Let Δp be the pressure drop across the length 'L'. For a laminar flow, Δp is proportional to

  1. Lρv2/D
  2. LμV/d2
  3. Dρv2/L
  4. μV/L
Correct answer: (A)

Lρv2/D

45.A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity

  1. Same as that of A
  2. One fourth as that of A
  3. Twice as that of A
  4. Four times as that of A
Correct answer: (B)
One fourth as that of A

46.A perfect gas

  1. Does not satisfy PV = nRT
  2. Is incompressible and has zero viscosity
  3. Has constant specific heat
  4. Can’t develop shear stresses
Correct answer: (C)
Has constant specific heat

47.A piezometer opening measures the _________ fluid pressure.

  1. Static
  2. Undisturbed
  3. Total
  4. Dynamic
Correct answer: (B)
Undisturbed

48.A piezometer provided in the pipe measures

  1. Friction factor
  2. Static pressure
  3. Dynamic pressure
  4. None of these
Correct answer: (B)
Static pressure

49.A pipe is defined as 'hydraulically smooth', if the friction factor

  1. Is not a function of Reynolds number
  2. For a given Reynolds number remains constant even on further smoothening of the pipe
  3. Is zero irrespective of the Reynolds number
  4. None of these
Correct answer: (B)
For a given Reynolds number remains constant even on further smoothening of the pipe

50.A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is

  1. 20 m/sec
  2. 10 m/sec
  3. 5 √2 m/sec
  4. 5 m/sec
Correct answer: (B)
10 m/sec
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