Fluid Mechanics

501.The fluid property which matters for falling rain drops to acquire spherical shape is its

  1. Pressure
  2. Height of descend
  3. Viscosity
  4. Surface tension
Correct answer: (D)
Surface tension

502.The fluid property, due to which, mercury does not wet the glass is

  1. Surface tension
  2. Viscosity
  3. Cohesion
  4. Adhesion
Correct answer: (A)
Surface tension

503.The fluid velocity varies as the cube of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop for _________ fluid.

  1. Newtonian
  2. Pseudo-plastic
  3. Dilatent
  4. Bingham plastic
Correct answer: (B)
Pseudo-plastic

504.The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for _________ fluid.

  1. Newtonian
  2. Dilatant
  3. Pseudo-plastic
  4. Non-Newtonian
Correct answer: (A)
Newtonian

505.The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop of _________ fluid.

  1. Dilatent
  2. Pseudo-plastic
  3. Bingham plastic
  4. Newtonian
Correct answer: (A)
Dilatent

506.The friction factor for turbulent flow in a hydraulically smooth pipe

  1. Depends only on Reynolds number
  2. Does not depend on Reynolds number
  3. Depends on the roughness
  4. None of these
Correct answer: (A)
Depends only on Reynolds number

507.The friction factor is

  1. Always inversely proportional to the Reynolds number
  2. Not dimensionless
  3. Not dependent on the roughness of the pipe
  4. None of these
Correct answer: (D)
None of these

508.The frictional resistance in laminar flow does not depend on the

  1. Area of surface in contact
  2. Flow velocity
  3. Fluid temperature
  4. Pressure of flow
Correct answer: (A)
Area of surface in contact

509.The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is

  1. Q∝N : H∝N2 : P∝N3
  2. Q∝N2 : H∝N3 : P∝N
  3. Q∝N : H∝N3 : P∝N2
  4. Q∝N3 : H∝N : P∝N2
Correct answer: (A)

Q∝N : H∝N2 : P∝N3

510.The head developed by a centrifugal pump is largely determined by the

  1. Power of the pump
  2. Nature of the liquid being pumped
  3. Angle of the vanes and the speed of the tip of the impeller
  4. Vapour pressure of the liquid
Correct answer: (C)
Angle of the vanes and the speed of the tip of the impeller
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