Thermal conductivity is maximum for which substance
Silver
Ice
Aluminum
Diamond
Answer
Fourier law of heat conduction is best represented by
Q = -k A (d T /d x)
Q = k A (d x/d T)
Q = -k A
Q = k (d T/d x)
The negative sign in the Fourier heat conduction equation indicates
Heat always flow is in the direction of positive temperature gradient
Heat always flow in the direction of negative temperature gradient
No heat flow is there
Data is insufficient
“Thermal conductivity represents the amount of heat conducted across the unit area when a temperature difference of one kelvin”.
TRUE
FALSE
Which of the following is the unit of thermal resistance?
°C/kcal
hour degree
s °C/kcal
°C/W