Category: Heat Transfer

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 above

A. nature of body
B. temperature of body
C. type of surface of body
D. all of the above
E. none of the above

A. 0.1
B. 0.3
C. 0.7
D. 1.7
E. 10.5

A. black bodies
B. polished bodies
C. all coloured bodies
D. all of the above
E. none of the above

A. same
B. higher
C. more or less same
D. very much lower
E. very much higher

A. convection
B. free convection
C. forced convection
D. radiation
E. radiation and convection

Pick up the wrong case?

A. face area
B. time
C. thickness
D. temperature difference
E. thermal conductivity

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

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

A. hr (time)
B. sqm (area)
C. °C (temperature)
D. cm (thickness)
E. kcal (heat).