Pipe Wall Temperature and Flow in Pipe Profiles MCQ

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• A non-conducting liquid is passed inside a metal tube carrying electricity (Voltage=220V, current=0.5A), what is the final temperature of the bulk of liquid if it enters at 10℃. (h =100 W/m2K, Area =0.2m2)
  ক

  25.5℃

  খ

  15.0℃

  গ

  15.5℃

  ঘ

  14.5℃
• The temperature profile of a fully developed Thermal flow in a pipe of length L can be defined by the formula. Tbulk – Twall = (Tinlet – Twall)eλL
  ক

  True

  খ

  False
• Given a fluid enters at a temperature of 22℃into a pipe of length 1m. On fully developed thermal flow, the wall temperature is 92℃, determine the temperature of the bulk of the liquid at exit. (Given λ = 0.5)
  ক

  50℃

  খ

  100℃

  গ

  104℃

  ঘ

  150℃
• A liquid is heated by passing it through a circular pipe (kpipe = 15W/mK, viscosity = 2.5×10-5 Pa-s, Cp = 1000 J/Kg-K, kliquid = 0.035 W/mK) of ID = 25mm and OD = 30mm with length L = 15 m. If the Reynolds No. is 79000. What is the outer surface average heat transfer coefficient?
  ক

  773KW/m2K

  খ

  83KW/m2K

  গ

  104KW/m2K

  ঘ

  43KW/m2K
• Velocity profile in a pipe is independent of axial position whereas Temperature Profile is not.
  ক

  True

  খ

  False