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MCQs

Total Questions : 1709 | Page 4 of 171 pages
Question 31. A fluid of kinematic viscosity 0.4 cm²/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be
  1.    less than 1 m/sec
  2.    1 m/sec
  3.    1.5 m/sec
  4.    2 m/sec
 Discuss Question
Answer: Option B. -> 1 m/sec
Question 32. Capillary action is due to the
  1.    surface tension
  2.    cohesion of the liquid
  3.    adhesion of the liquid molecules and the molecules on the surface of a solid
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 33. Center of pressure on an inclined plane is
  1.    at the centroid
  2.    above the centroid
  3.    below the centroid
  4.    at metacentre
 Discuss Question
Answer: Option C. -> below the centroid
Question 34. Stream lines and path lines always coincide in case of
  1.    steady flow
  2.    laminar flow
  3.    uniform flow
  4.    turbulent flow
 Discuss Question
Answer: Option A. -> steady flow
Question 35. Which of the following velocity potentials satisfies continuity equation ?
  1.    x2y
  2.    x2-y2
  3.    cosx
  4.    x2 + y2
 Discuss Question
Answer: Option B. -> x2-y2
Question 36. For manometer, a better liquid combination is one having
  1.    higher surface tension
  2.    lower surface tension
  3.    surface tension is no criterion
  4.    high density and viscosity
 Discuss Question
Answer: Option A. -> higher surface tension
Question 37. The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately
  1.    5 mm
  2.    10 mm
  3.    20 mm
  4.    30 mm
 Discuss Question
Answer: Option D. -> 30 mm
Question 38. The continuity equation is connected with
  1.    viscous/unviscous fluids
  2.    compressibility of fluids
  3.    conservation of mass
  4.    steady/unsteady flow
 Discuss Question
Answer: Option C. -> conservation of mass
Question 39. Kinematic viscosity is dependent upon
  1.    pressure
  2.    distance
  3.    flow
  4.    density
 Discuss Question
Answer: Option D. -> density
Question 40. Froude number is significant in
  1.    supersonics, as with projectile and jet propulsion
  2.    full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
  3.    simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
  4.    all of the above
 Discuss Question
Answer: Option C. -> simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls

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