Heat Transfer by Convection MCQ

Test your knowledge with important Heat Transfer by Convection MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Heat Transfer by Convection MCQs on Bissoy. Bissoy App

• If qw =2500x where x is in m and in the direction of flow (x=0 at the inlet), the bulk mean temperature of the water leaving the pipe in °C is ________
  ক

  71

  খ

  76

  গ

  79

  ঘ

  81
• In laminar developing flow through a pipe with constant wall temperature, the magnitude of the pipe wall inner surface convective heat transfer coefficient shall be maximum at the:
  ক

  Middle length of flow

  খ

  Beginning of flow

  গ

  End of flow

  ঘ

  One third of the length of flow
• The characteristic length for computing Grashoff number of horizontal cylinder is ___________
  ক

  The length of the cylinder

  খ

  The diameter of the cylinder

  গ

  The perimeter of the cylinder

  ঘ

  The radius of the cylinder
• The laminar boundary layer occurs when a cold fluid over a hot plate. In which of the following positions, the temperature gradient assumes zero value?
  ক

  At bottom of boundary layer

  খ

  In mid free stream of fluid

  গ

  At top of boundary layer

  ঘ

  At the junction of laminar and turbulent boundary layer
• Which of the following non-dimensional numbers is used for transition from laminar flow to turbulent flow in the free convection?
  ক

  Reynolds number

  খ

  Grashoff number

  গ

  Peclet number

  ঘ

  Rayleigh number
• Nusselt number for fully developed turbulent flow in a pipe is given by Nu=C Rea Prb. the values of a and b are?
  ক

  a=0.5 and b=0.33 for heating and cooling

  খ

  a=0.5 and b=0.4 for heating and b=0.3 for cooling

  গ

  a=0.8 and b=0.4 for heating and b=0.3 for cooling

  ঘ

  a=0.8 and b=0.3 for heating and b=0.4 for cooling
• Hot air at 50°C. If the forced heat transfer convection is 75 W/m2K, the heat gain rate gain rate by the plate through an area of 2m2 will be _____
  ক

  15KW

  খ

  22.5KJ/sec

  গ

  7.5KJ/sec

  ঘ

  25KJ/sec