Flow of Viscous Fluid Through Circular Pipes MCQ

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• Which of the following flows have the highest critical Reynolds number (lower)?
  ক

  Flow in a pipe

  খ

  Flow between parallel plates

  গ

  Flow in an open channel

  ঘ

  Flow around spherical body
• What can be the maximum diameter of the pipe for the water flow of velocity 1 m/s (ν = 10-6) to be laminar in nature? Assume Lower critical Reynolds number to be 2100.
  ক

  2.1 mm

  খ

  21 mm

  গ

  21 cm

  ঘ

  0.21 mm
• The flow through a circular pipe is laminar. Now, the fluid through the pipe is replaced with a more viscous fluid and passed through the pipe again with the same velocity. What can we say about the nature of this flow?
  ক

  The flow will become turbulent

  খ

  The flow will be a transition flow

  গ

  The flow will remain laminar

  ঘ

  The Reynolds number of the earlier flow is required to answer this question
• The Reynolds number is found out for a flow in a circular pipe. This circular pipe is moulded into a square pipe, keeping length of the pipe same. Ignore the thickness of the pipe. The Reynolds number changes by __________
  ক

  57% decrease

  খ

  57% increase

  গ

  43% decrease

  ঘ

  43% increase
• Water flows through a circular tube with a velocity of 2 m/s. The diameter of the pipe is 14 cm. Take kinematic viscosity of water 10-6 m2/s and density of water 1000 kg/m3.
  ক

  2.8*108

  খ

  2.8*105

  গ

  2800

  ঘ

  28000
• A circular pipe of radius 7 cm is used for water flow transmission. This pipe is moulded into another pipe with a square cross-section keeping the length same. (Ignore the thickness of the pipe). Calculate the hydraulic diameter of the moulded pipe. (Take π = 22/7).
  ক

  11 cm

  খ

  7 cm

  গ

  3.5 cm

  ঘ

  22 cm
• How is Reynolds number defined as?
  ক

  Ratio of pressures in the inlet to the outlet of a pipe

  খ

  The product of velocity of the flow and the diameter of the pipe, divided by the kinematic viscosity of fluid

  গ

  The product of density of the fluid, velocity of the flow and the diameter of the pipe, divided by the dynamic viscosity of fluid

  ঘ

  Ratio of inertia force to viscous force
• Which of the factors primarily decide whether the flow in a circular pipe is laminar or turbulent?
  ক

  The Prandtl Number

  খ

  The Pressure gradient along the length of the pipe

  গ

  The dynamic viscosity coefficient

  ঘ

  The Reynolds Number
• When a problem states “The velocity of the water flow in a pipe is 20 m/s”, which of the following velocities is it talking about?
  ক

  RMS velocity

  খ

  Average velocity

  গ

  Absolute velocity

  ঘ

  Relative velocity
• For a fully-developed pipe flow, how does the pressure vary with the length of the pipe?
  ক

  Linearly

  খ

  Parabolic

  গ

  Exponential

  ঘ

  Constant