Heat Transfer - Interview Questions | Exam2Win

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16. Pick up tne wrong case. Heat flowing from one side to other depends directly on

A. face area

B. time

C. thickness

D. temperature difference

E. thermal conductivity.

Explanation:

17. The insulation ability of an insulator with the presence of moisture would

A. increase

B. decrease

C. remain unaffected

D. may increase/decrease depending on temperature and thickness of insulation

E. none of the above.

Explanation:

18. Film coefficient is defined as Inside diameter of tube

A. Equivalent thickness of film

B. Thermal conductivity Equivalent thickness of film Specific heat x Viscosity

C. Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

D. Film coefficient x Inside diameter Thermal conductivity

E. none of the above.

Explanation:

19. Thermal conductivity of wood depends on

A. moisture

B. density

C. temperature

D. all of the above

E. none of the above.

Explanation:

20. Which of the following is expected to have highest thermal conductivity

A. steam

B. solid ice

C. melting ice

D. water

E. boiling water.

Explanation:

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