Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in _________________?

Related Mcqs:

1. In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________?

   A. convection
   B. radiation
   C. conduction
   D. both convection and conduction
   E. none of the above

2. When heat is transferred form hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by __________________?

   A. conduction
   B. convection
   C. radiation
   D. conduction and convection
   E. convection and radiation

3. When heat is Transferred by molecular collision, it is referred to as heat transfer by __________________?

   A. conduction
   B. convection
   C. radiation
   D. scattering
   E. convection and radiation

4. When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by ___________________?

   A. conduction
   B. convection
   C. radiation
   D. conduction and convection
   E. convection and radiation

5. A non-dimensional number generally associated with natural convection heat transfer is________________?

   A. Grashoff number
   B. Nusselt number
   C. Weber number
   D. Prandtl number
   E. Reynold number

6. The concept of overall coefficient of heat transfer is used in case of heat transfer by________________?

   A. conduction
   B. convection
   C. radiation
   D. conduction and convection
   E. convection and radiation

7. Which of the following is the case of heat transfer by radiation ___________________?

   A. blast furnace
   B. heating of building
   C. cooling of parts in furnace
   D. heat received by a person from fireplace
   E. all of the above

8. Heat transfer by radiation mainly depends upon___________________?

   A. its temperature
   B. nature of the body
   C. kind and extent of its surface
   D. all of the above
   E. none of the above

9. The amount of heat flow through a body by conduction is_______________?

   A. directly proportional to the surface area of the body
   B. directly proportional to the temperature difference on the two faces of the body
   C. dependent upon the material of the body
   D. inversely proportional to the thickness of the body
   E. all of the above

10. Fourier’s law of heat conduction is valid for_________________?

    A. one dimensional cases only
    B. two dimensional cases only
    C. three dimensional cases only
    D. regular surfaces having non-uniform temperature gradients
    E. irregular surfaces