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Chemical Engineering

Fluid Mechanics MCQs

Practice Fluid Mechanics MCQs for competitive exams.

Fluid Mechanics MCQs

Practice questions from this topic.

The value of critical Reynolds number for pipe flow is

  1. A. 1,300
  2. B. 10,000
  3. C. 1,00,000
  4. D. None of these
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The unit of dynamic viscosity in SI unit is

  1. A. kg/m . sec
  2. B. N/m²
  3. C. m² /sec
  4. D. m/N. sec
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A stream line is

  1. A. Fixed in space in steady flow
  2. B. Always the path of particle
  3. C. Drawn normal to the velocity vector at every point
  4. D. A line connecting the mid points of flow cross-section
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Boundary layer separation occurs when the

  1. A. Pressure reaches a minimum
  2. B. Cross-section of the channel is reduced
  3. C. Valve is closed in a pipeline
  4. D. Velocity of sound is reached
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If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is

  1. A. Same in both the tubes
  2. B. Greater in 1 mm dia tube
  3. C. Greater in 0.5 mm dia tube
  4. D. Zero in both the tubes
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Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will

  1. A. Increase
  2. B. Decrease
  3. C. Remain same
  4. D. Data insufficient to predict pressure drop
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Medium viscosity lubricating oil can be most ideally pumped by a __________ pump.

  1. A. Vane
  2. B. Piston
  3. C. Centrifugal
  4. D. Plunger
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Slurries can be most conveniently pumped by a __________ pump.

  1. A. Screw
  2. B. Reciprocating
  3. C. Gear
  4. D. Centrifugal
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The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a

  1. A. Weir
  2. B. Pitot tube
  3. C. Kennison nozzle
  4. D. V-notch
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The unit of bulk modulus of elasticity for a liquid in S.I. unit is

  1. A. N
  2. B. N/m
  3. C. N/m 2
  4. D. N/m 3
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Water is flowing at 1 m/sec through a pipe (of 10 cm I.D.) with a right-angle bend. The force in Newtons exerted on the bend by water is

  1. A. $$10sqrt 2 pi $$
  2. B. $$frac{{5pi }}{2}$$
  3. C. $$5sqrt 2 pi $$
  4. D. $$frac{{5pi }}{{sqrt 2 }}$$
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__________ is an example of axial flow impeller.

  1. A. Paddle
  2. B. Turbine
  3. C. Propeller
  4. D. All of the above
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