Stefan Boltzmann law is applicable for heat transfer by __________________?

Related Mcqs:

1. According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to___________________?

   A. absolute temperature B. square of temperature C. fourth power of absolute temperature D. fourth power of temperature E. cube of absolute temperature...

2. The unit of Stefan Boltzmann constant is ____________________?

   A. watt/cm2 °K B. watt/cm4 °K C. watt2/cm °K4 D. watt/cm2 °K4 E. watt/cm2 °K2...

3. 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...

4. 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...

5. 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...

6. 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...

7. According to Stefan’s law, the total radiation from a black body per second per unit area is proportional to____________________?

   A. absolute temperature B. T2 C. T5 D. t E. l/T...

8. 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...

9. In regenerator type heat exchanger, heat transfer takes place by___________________?

   A. direct mixing of hot and cold fluids B. a complete separation between hot and cold fluids C. flow of hot and cold fluids alternately over a surface D. generation of heat again and again E. indirect transfer...

10. Sensible heat is the heat required to __________________?

    A. change vapour into liquid B. change liquid into vapour C. increase the temperature of a liquid of vapour D. convert water into steam and superheat it E. convert saturated steam into dry steam...