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  1. The process of heat transfer from one particle of the body to another is called conduction, when the…
  2. According to Newton's law of cooling, the heat transfer from a hot body to a cold body is
  3. The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to
  4. Which of the following statement is correct?
  5. Depending on the radiating properties, a body will be opaque when
  6. Unit of thermal conductivity in M.K.S. units is
  7. The ratio of the energy absorbed by the body to total energy falling on it is called
  8. The radiation emitted by a black body is known as
  9. Conduction is a process of heat transfer
  10. Depending on the radiating properties, body will be transparent when
  11. The unit of overall coefficient of heat transfer is
  12. The natural convection air cooled condensers are used in
  13. When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the…
  14. Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly…
  15. The amount of radiation mainly depends on
  16. The total emissivity power is .defined as the total amount of radiation emitted by a black body per…
  17. Metals are good conductors of heat because
  18. Thermal conductivity of solid metals with rise in temperature normally
  19. The thermal diffusivities for solids are generally
  20. Heat transfer in liquid and gases takes place by
  21. The unit of Stefan Boltzmann constant is
  22. The critical radius is the insulation radius at which the resistance to heat flow is
  23. Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in
  24. The time constant of a thermocouple is
  25. The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface,…
  26. Radiation is the process of heat transfer in which heat flows from a ________, in a straight line, without…
  27. Thermal diffusivity of a substance is
  28. The transfer of heat by molecular collision is known as
  29. A grey body is one whose absorptivity
  30. Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of…