Joule sec is the unit of_________________?

Related Mcqs:

1. Heat conducted througfi unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called__________________?

   A. thermal resistance
   B. thermal coefficient
   C. temperature gradient
   D. thermal conductivity
   E. heat-transfer

2. The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________?

   A. emissivity
   B. transmissivity
   C. reflectivity
   D. intensity of radiation
   E. absorptivity

3. Unit of thermal conductivity in M.K.S. units is ___________________?

   A. kcal/kg m2 °C
   B. kcal-m/hr m2 °C
   C. kcal/hr m2 °C
   D. kcal-m/hr °C
   E. kcal-m/m2 °C

4. Unit of thermal conductivity in S.I. units is__________________?

   A. J/m2 sec
   B. J/m °K sec
   C. W/m °K
   D. A. and C. above
   E. B. and C. above

5. 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

6. The unit of overall coefficient of heat transfer is___________________?

   A. kcal/m2
   B. kcal/hr °C
   C. kcal/m2 hr °C
   D. kacl/m hr °C
   E. kcal/m3 hr °C

7. 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

8. 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

9. Heat transfer in liquid and gases takes place by_____________________?

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

10. According to Prevost theory of heat exchange ___________________?

    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