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MCQs

Total Questions : 3218 | Page 8 of 322 pages
Question 71. The losses in open channel flow generally vary as the
  1.    Inverse of the roughness
  2.    First power of the roughness
  3.    Square of the velocity
  4.    Inverse square of hydraulic radius
 Discuss Question
Answer: Option B. -> First power of the roughness
Question 72. What is the unit of kinematic viscosity in SI unit?
  1.    m²/sec
  2.    N/m² . sec
  3.    Kg . sec/m
  4.    None of these
 Discuss Question
Answer: Option A. -> m²/sec
Question 73. If Blausius or Darcey friction factor is 'f₁' then the Fanning friction factor is equal to
  1.    f₁/4
  2.    4F₂
  3.    2f₁
  4.    f₁/2
 Discuss Question
Answer: Option A. -> f₁/4
Question 74. The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides 'x' & 'y' is given by
  1.    2xy/(x+y)
  2.    xy/(x+y)
  3.    (x+y)/2xy
  4.    (x+y)/xy
 Discuss Question
Answer: Option A. -> 2xy/(x+y)
Question 75. Nature of fluid flow during the opening of a valve in a pipeline is
  1.    Laminar
  2.    Unsteady
  3.    Steady
  4.    Uniform
 Discuss Question
Answer: Option B. -> Unsteady
Question 76. Pick out the wrong statement about cavitation.
  1.    Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation
  2.    Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities
  3.    Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise
  4.    Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades
 Discuss Question
Answer: Option D. -> Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades
Question 77. __________ forces act on a particle moving through a stationary fluid.
  1.    Gravity
  2.    Drag
  3.    Buoyant
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 78. Stoke's law is valid, when NNRe,p is less than
  1.    2
  2.    100
  3.    2100
  4.    700
 Discuss Question
Answer: Option A. -> 2
Question 79. Correction for capillary effect in manometers (used for pressure measurement) need not be applied, if diameter of the manometer tube is __________ mm.
  1.    < 4
  2.    > 4
  3.    > 12.5
  4.    < 10
 Discuss Question
Answer: Option C. -> > 12.5
Question 80. Pick out the wrong statement.
  1.    The eddy viscosity is a function of the type of turbulence involved
  2.    The eddy viscosity is a fluid property
  3.    The viscosity of gas increases with increase in temperature
  4.    The viscosity of a liquid increases with decrease in temperature
 Discuss Question
Answer: Option B. -> The eddy viscosity is a fluid property

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