Heat Transfer

In a lithium bromide absorption refrigeration system

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lithium bromide is used as a refrigerant and water as an absorbent
water is used as a refrigerant and lithium bromide as an absorbent
ammonia is used as a refrigerant and lithium bromide as an absorbent
none of the above
✅ The correct answer is option B.

The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as

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conduction
free convection
forced convection
radiation
✅ The correct answer is option C.

According to Stefan-Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

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absolute temperature
square of the absolute temperature
cube of the absolute temperature
fourth power of the ab
✅ The correct answer is option D.

A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

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AU Cmin
✅ The correct answer is option D.