Fluid Mechanics

291.In case of Venturimeter, friction losses are about _________ percent of maximum velocity head.

  1. 2
  2. 8
  3. 12
  4. 20
Correct answer: (A)
2

292.In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure _________ the vapor pressure of the liquid at the suction temperature.

  1. Lower than
  2. Higher than
  3. Equal to
  4. None of these
Correct answer: (B)
Higher than

293.In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes

  1. Less than atmospheric pressure
  2. More than liquid vapor pressure
  3. Less than liquid vapor pressure
  4. More than atmospheric pressure
Correct answer: (C)
Less than liquid vapor pressure

294.In continuous fluidisation

  1. Solids are completely entrained
  2. The pressure drop is less than that for batch fluidisation
  3. There is no entrainment of solids
  4. Velocity of the fluid is very small
Correct answer: (A)
Solids are completely entrained

295.In deriving Bernoulli's equation, fluid is assumed to be

  1. Incompressible, frictionless, steady, along a streamline
  2. Uniform, steady, incompressible, along a streamline
  3. Steady, density being pressure dependent, frictionless
  4. None of these
Correct answer: (A)
Incompressible, frictionless, steady, along a streamline

296.In fluid flow, cavitation is caused, if the

  1. Fluid velocity decreases to zero
  2. Total energy decreases
  3. Both (A) and (B)
  4. Flow pressure approaches its vapor pressure at the prevailing temperature
Correct answer: (D)
Flow pressure approaches its vapor pressure at the prevailing temperature

297.In fluid flow, the boundary layer separation cannot occur

  1. In case of boundaries experiencing form drag
  2. At points of abrupt changes in the flow directions
  3. In laminar flow
  4. None of these
Correct answer: (D)
None of these

298.In fluid flow, the stagnation point is defined as a point, where the _________ is zero.

  1. Flow velocity
  2. Pressure
  3. Total energy
  4. All (A), (B) and (C)
Correct answer: (A)
Flow velocity

299.In frictional fluid flow, the quantity, (P/ρ) + (v2/2gc) + gz/gc) is

  1. Constant along a streamline
  2. Not constant along a streamline
  3. Increased in the direction of flow
  4. None of these
Correct answer: (B)
Not constant along a streamline

300.In hindered settling, the particles are

  1. Placed farther from the wall
  2. Not affected by other particles and the wall
  3. Near each other
  4. None of these
Correct answer: (C)
Near each other
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