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MCQs

Total Questions : 1709 | Page 5 of 171 pages
Question 41. Reynolds 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 B. -> full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
Question 42. Mach number is significant in
  1.    supersonics, as with projectiles 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 force, and wave making effects, as with ship’s hulls
  4.    all of fhe above
 Discuss Question
Answer: Option A. -> supersonics, as with projectiles and jet propulsion
Question 43. A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury?
  1.    the metal piece will simply float over the mercury
  2.    the metal piece will be immersed in mercury by half
  3.    whole of the metal piece will be immersed with its top surface just at mercury level
  4.    metal piece will sink to the bottom
 Discuss Question
Answer: Option C. -> whole of the metal piece will be immersed with its top surface just at mercury level
Question 44. The viscosity of a gas
  1.    decreases with increase in temperature
  2.    increases with increase in temperature
  3.    is independent of temperature
  4.    is independent of pressure for very high pressure intensities
 Discuss Question
Answer: Option B. -> increases with increase in temperature
Question 45. The pressure at the summit of a syphon is
  1.    equal to atmospheric
  2.    less than atmospheric
  3.    more than atmospheric
  4.    none of the above
 Discuss Question
Answer: Option B. -> less than atmospheric
Question 46. In a free vortex motion, the radial component of velocity everywhere is
  1.    maximum
  2.    minimum
  3.    zero
  4.    non-zero and finite
 Discuss Question
Answer: Option C. -> zero
Question 47. The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to
  1.    2100
  2.    2700
  3.    10,000
  4.    21,000
 Discuss Question
Answer: Option D. -> 21,000
Question 48. A fluid in equilibrium can’t sustain
  1.    tensile stress
  2.    compressive stress
  3.    shear stress
  4.    bending stress
 Discuss Question
Answer: Option C. -> shear stress
Question 49. If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is
  1.    4/3
  2.    3/2
  3.    9/4
  4.    27/8
 Discuss Question
Answer: Option C. -> 9/4
Question 50. With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on
  1.    a circular disc of plate held normal to flow
  2.    a sphere
  3.    a cylinder
  4.    a streamlined body
 Discuss Question
Answer: Option A. -> a circular disc of plate held normal to flow

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