Conduction Through a Cylindrical Wall MCQ

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• A stainless steel tube with inner diameter 12 mm, thickness 0.2 mm and length 50n cm is heated electrically. The entire 15 k W of heat energy generated in the tube is transferred through its outer surface. Find the intensity of the current flow
  ক

  52 amps

  খ

  62 amps

  গ

  72 amps

  ঘ

  82 amps
• A cylindrical cement tube of radii 0.05 cm and 1.0 cm has a wire embedded into it along its axis. To maintain a steady temperature difference of 120 degree Celsius between the inner and outer surfaces, a current of 5 ampere is made to flow in the wire. Find the amount of heat generated per meter length. Take resistance of wire equal to 0.1 ohm per cm of length
  ক

  150 W/m length

  খ

  250 W/m length

  গ

  350 W/m length

  ঘ

  450 W/m length
• For steady state and a constant value of thermal conductivity, the temperature distribution associated with radial convection through a cylinder is
  ক

  Linear

  খ

  Parabolic

  গ

  Logarithmic

  ঘ

  Exponential
• A cylinder of radius r and made of material of thermal conductivity k 1 is surrounded by a cylindrical shell of inner radius r and outer radius 2r. This outer shell is made of a material of thermal conductivity k 2. Net conductivity would be
  ক

  k 1 + 3 k 2/4

  খ

  k 1 + k 2/4

  গ

  k 1 + 3k 2

  ঘ

  k 1 + k 2
• The heat flow equation through a cylinder of inner radius r1 and outer radius r2 is desired to be written in the same form as that for heat flow through a plane wall. For wall thickness (r 2-r 1) the area will be
  ক

  A1 + A2/2

  খ

  A1 + A2

  গ

  A2 – A1/ log e (A2/A1)

  ঘ

  A1 + A2/2 log e (A2/A1)
• A hot fluid is being conveyed through a long pipe of 4 cm outer diameter and covered with 2 cm thick insulation. It is proposed to reduce the conduction heat loss to the surroundings to one-third of the present rate by further covering with same insulation. Calculate the additional thickness of insulation
  ক

  11 cm

  খ

  12 cm

  গ

  13 cm

  ঘ

  14 cm
• Logarithmic mean area of the cylindrical tube is given as
  ক

  2πr m

  খ

  πr ml

  গ

  2πr ml

  ঘ

  2r ml
• A steel pipe of 20 mm inner diameter and 2 mm thickness is covered with 20 mm thick of fiber glass insulation (k = 0.05 W/m degree). If the inside and outside convective coefficients are 10 W/m2 degree and 5 W/m2 degree, calculate the overall heat transfer coefficient based on inside diameter of pipe. In the diagram, the diameter of small circle is 20 mm
  ক

  1.789 W/m2 degree

  খ

  2.789 W/m2 degree

  গ

  3.789 W/m2 degree

  ঘ

  4.789 W/m2 degree
• The rate of heat conduction through a cylindrical tube is usually expressed as
  ক

  Per unit length

  খ

  Per unit area

  গ

  Only length

  ঘ

  Only area
• Typical examples of heat conduction through cylindrical tubes are not found in
  ক

  Power plants

  খ

  Oil refineries

  গ

  Most process industries

  ঘ

  Aircrafts