Correct answer
C. Storage batteries
Explanation
The correct answer is Storage batteries.
A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions? Assume that the conductive heat transfer co-efficient is infinitely large?
Prandtl number for most of dry gases is about________?
A solar cell converts the sunlight directly into ________ energy?
The chamber process is________?
________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?
Mullite is chemically represented by________?