Fluid Mechanics

31.A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an _________ fluid.

  1. Newtonian
  2. Non-Newtonian
  3. Ideal
  4. Incompressible
Correct answer: (A)
Newtonian

32.A fluid whose apparent viscosity increases with shear rate is termed as the _________ fluid.

  1. Newtonian
  2. Viscous
  3. Dilatant
  4. Non-viscous
Correct answer: (C)
Dilatant

33.A gas (density = 1.5 kg/m3, viscosity = 2 × 10‒5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5 kg/m3and viscosity of 3 × 10‒5kg/m.s flowing at 3 m/s will be

  1. 8400 Pa/m
  2. 12600 Pa/m
  3. 18900 Pa/m
  4. 16800 Pa/m
Correct answer: (B)
12600 Pa/m

34.A globe valve is the most suitable for applications, in which

  1. Fluid flow control is required
  2. Fluid contains dispersed solid particles
  3. Valve is required to be either fully open or fully closed
  4. One way flow is required
Correct answer: (A)
Fluid flow control is required

35.A hydraulic accumulator comprises of

  1. A storage device and a control valve
  2. A cylinder and a plunger
  3. Two pistons and two cylinders
  4. A storage tank and a ram pump
Correct answer: (B)
A cylinder and a plunger

36.A hydraulic press has a ram of 10 cms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight of 10 tons on the ram is _________ kg.

  1. 10
  2. 100
  3. 1000
  4. 10000
Correct answer: (B)
100

37.A hydraulic ram acts as a/an _________ pump.

  1. Centrifugal
  2. Reciprocating
  3. Impulse
  4. Parallel cylinder
Correct answer: (C)
Impulse

38.A liquid is pumped at the rate of 600 litres using 1000 rpm. If the rpm is changed to 1100, the liquid pumped is _________ litres.

  1. 600
  2. 660
  3. 1.1
  4. 60
Correct answer: (B)
660

39.A lubricant 100 times more viscous than water would have a viscosity (in Pa.s)

  1. 0.01
  2. 0.1
  3. 1
  4. 10
Correct answer: (B)
0.1

40.A mercury (specific gravity = 13.6) manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be _________ cms.

  1. 17
  2. 42
  3. 84
  4. 1.8
Correct answer: (A)
17
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