Heat and Mass Transfer
Thermal conductivity of water _________ with rise in temperature.

May increase or decrease depending upon temperature
Increases
Remain same
Decreases

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
In counter flow heat exchangers

Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state
Both the fluids at exit are in their hottest state
Both the fluids at inlet are in their hottest state
One fluid is in hottest state and other in coldest state at inlet

ANSWER DOWNLOAD EXAMIANS APP

Heat and Mass Transfer
Kirchhoff's law states that

The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
The wave length corresponding to the maximum energy is proportional to the absolute temperature
None of these

ANSWER DOWNLOAD EXAMIANS APP