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.Management Sciences
A. it is impossible to transfer heat from low temperature source to t high temperature source
B. heat transfer by radiation requires no medium
C. all bodies above absolute zero emit radiation
D. heat transfer in most of the cases takes place by combination of conduction, convection and radiation
E. rate of heat transfer depends on thermal conductivity and temperature difference
Related Mcqs:
- 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...
- The time constant of a thermocouple is_______________?
- A. the time taken to attain the final temperature to be measured B. the time taken to attain 50% of the value of initial temperature difference C. the time taken to attain 63.2% of the value of initial temperature difference D. determined by the time taken to reach 100°C from 0°C E. none of the … The time constant of a thermocouple is_______________?Read More...
- Unit of thermal diffusivity is_________________?
- A. m2/hr B. m2/hr°C C. kcal/m2 hr D. kcal/m.hr°C E. kcal/m2 hr°C...
- In free con-vection heat transfer, Nusselt number is function of________________?
- A. Grashoff no. and Reynold no B. Grashoff no and Prandtl no. C. Prandtl no. and Reynold no D. Grashoff no., Prandtl no and Reynold no E. none of the above...
- Absorptivity of a body will be equal to its emissivity___________________?
- A. at all temperatures B. at one particular temperature C. when system is under thermal equi-librium D. at critical temperature E. for a polished body...
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