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MCQs

Total Questions : 3218 | Page 3 of 322 pages
Question 21. The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the __________ length.
  1.    Equivalent
  2.    Transition
  3.    Prandtl mixing
  4.    None of these
 Discuss Question
Answer: Option B. -> Transition
Question 22. The ratio of inertial forces to elastic forces is called the __________ number.
  1.    Reynolds
  2.    Mach
  3.    Euler
  4.    Weber
 Discuss Question
Answer: Option B. -> Mach
Question 23. N²Re/NFr is called the __________ number.
  1.    Brinkman
  2.    Galileo
  3.    Archimedes
  4.    Euler
 Discuss Question
Answer: Option B. -> Galileo
Question 24. The ratio of inertial forces to gravity forces is called the __________ number.
  1.    Mach
  2.    Froude
  3.    Euler
  4.    Weber
 Discuss Question
Answer: Option B. -> Froude
Question 25. The ratio of pressure forces to inertial forces is called the __________ number.
  1.    Froude
  2.    Euler
  3.    Reynold
  4.    Mach
 Discuss Question
Answer: Option B. -> Euler
Question 26. Ratio of inertial forces to surface tension forces is called the __________ number.
  1.    Euler
  2.    Froude
  3.    Mach
  4.    Weber
 Discuss Question
Answer: Option D. -> Weber
Question 27. The ratio of inertial forces to viscous forces is called the __________ number.
  1.    Weber
  2.    Mach
  3.    Froude
  4.    Reynold
 Discuss Question
Answer: Option D. -> Reynold
Question 28. Cavitation in a centrifugal pump can be avoided by keeping the
  1.    Inlet pressure high
  2.    Outlet pressure low
  3.    Inlet pressure low
  4.    Outlet pressure high
 Discuss Question
Answer: Option A. -> Inlet pressure high
Question 29. Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton's law of viscosity.(II) Newton's second law of motion. (III) The continuity equation.(IV) Velocity of boundary layer must be zero relative to boundary.(V) Fluid cannot penetrate a boundary.
  1.    I, II, III
  2.    II, III, V
  3.    I, II, V
  4.    II, IV, V
 Discuss Question
Answer: Option B. -> II, III, V
Question 30. Cavitation in a centrifugal pump results from
  1.    High discharge pressure
  2.    Low barometric pressure
  3.    High discharge velocity
  4.    High discharge rate
 Discuss Question
Answer: Option B. -> Low barometric pressure

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