Fluid Mechanics

111.Cd for the orifice plate varies from

  1. 0.58 to 0.8
  2. 0.93 to 0.98
  3. 0.2 to 0.3
  4. 0.02 to 0.03
Correct answer: (A)
0.58 to 0.8

112.Cd, Cc and Cv are related (for flow through an orifice) as (where, Cd = discharge co-efficient, Cc = co-efficient of contraction = (area of jet at vena-contracta/area of opening), Cv = co-efficient of velocity = (actual velocity at vena-contracta/theoretical velocity).

  1. Cd = Cc/Cv
  2. Cd = Cc.Cv
  3. Cd = Cv/ Cc
  4. None of these
Correct answer: (B)

Cd = Cc.Cv

113.Capacity of a hydraulic accumulator is defined in terms of maximum

  1. Amount of energy stored
  2. Flow rate through accumulator
  3. Rate of falling of ram
  4. Volume available in the cylinder
Correct answer: (A)
Amount of energy stored

114.Capacity of a rotary gear pump can be varied by

  1. Changing the speed of rotation
  2. Bleeding air into suction
  3. Bypassing liquid from the suction or discharge line
  4. All (A), (B) and (C)
Correct answer: (D)
All (A), (B) and (C)

115.Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)

  1. d
  2. 1/d
  3. σ
  4. 1/σ
Correct answer: (C)
σ

116.Capillary tube method of viscosity measurement is based on the

  1. Hagen-Poiseuille’s equation
  2. Stoke's law
  3. Navier-stokes equation
  4. None of these
Correct answer: (A)
Hagen-Poiseuille’s equation

117.Cavitation can be prevented by

  1. Suitably designing the pump
  2. Maintaining the suction head sufficiently greater than the vapour pressure
  3. Maintaining suction head = developed head
  4. Maintaining suction head lower than the vapour pressure
Correct answer: (B)
Maintaining the suction head sufficiently greater than the vapour pressure

118.Cavitation in a centrifugal pump can be avoided by keeping the

  1. Inlet pressure high
  2. Outlet pressure low
  3. Inlet pressure low
  4. Outlet pressure high
Correct answer: (A)
Inlet pressure high

119.Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation?

  1. Decrease in effect
  2. Increase in thrust
  3. Develops noise
  4. Develops high pressure
Correct answer: (D)
Develops high pressure

120.Cavitation occurs in a centrifugal pump when the suction pressure is

  1. Less than the vapour pressure of the liquid at that temperature
  2. Greater than the vapour pressure of the liquid at that temperature
  3. Equal to the vapour pressure
  4. Equal to the developed head
Correct answer: (A)
Less than the vapour pressure of the liquid at that temperature
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