A. hr (time)
B. sqm (area)
C. °C (temperature)
D. cm (thickness)
E. kcal (heat).
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
The time constant of a thermocouple is_______________? Read More »
Heat Transfer A. 0.1
B. 0.23
C. 0.42
D. 0.51
E. 0.64
Thermal conductivity of water at 20°C is of the order of_____________________? Read More »
Heat Transfer A. change vapour into liquid
B. change liquid into vapour
C. increase the temperature of a liquid or vapour
D. convert water into steam and superheat it
E. convert saturated steam into dry steam
Total heat is the heat required to__________________? Read More »
Heat Transfer A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. none of the above
Thermal conductivity of air with rise in temperature__________________? Read More »
Heat Transfer A. 0.002
B. 0.02
C. 0.01
D. 0.1
E. 0.5
A. free electrons
B. atoms colliding frequency
C. low density
D. porous body
E. all of the above
Cork is a good insulator because it has___________________? Read More »
Heat Transfer A. their atoms collide frequently
B. their atoms-are relatively far apart
C. they contain free electrons
D. they have high density
E. all of the above
Metals are good conductors of heat because________________? Read More »
Heat Transfer A. thermometer
B. radiatiouv pyrometer
C. thermistor
D. thermocouple
E. thermopile
Temperature of steam at around 540°C can be measured by ____________________? Read More »
Heat Transfer A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. none of the above
Thermal conductivity of water in general with rise in temperature ____________________? Read More »
Heat Transfer