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heat transfer MCQs

Practise focused heat transfer questions with marked answers for exam preparation and subject revision.

heat transfer Mcqs

1. Sensible heat is the heat required to __________________?
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A. change liquid into vapour

B. change vapour into liquid

C. convert saturated steam into dry steam

D. increase the temperature of a liquid of vapour

E. convert water into steam and superheat it

2. Unit of thermal conductivity in M.K.S. units is ___________________?
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A. kcal-m/hr C

B. kcal/hr m2 C

C. kcal-m/hr m2 C

D. kcal/kg m2 C

E. kcal-m/m2 C

3. The insulation ability of an insulator with the presence of moisture would_________________?
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A. none of the above

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

C. decrease

D. increase

E. remain unaffected

4. Which of the following is a case of steady state heat transfer ___________________?
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A. none of the above

B. all of the above

C. heating of building in winter

D. I.C. engine

E. air preheaters

5. When heat is transferred form hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by __________________?
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A. convection

B. conduction and convection

C. conduction

D. radiation

E. convection and radiation

6. Film coefficient is defined as Inside diameter of tube________________?
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A. Film coefficient x Inside diameter Thermalconductivity

B. Equivalent thickness of film

C. none of the above

D. Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

E. Thermal conductivity Equivalent thickness of film Specific heat x Viscocity

7. Temperature of steam at around 540C can be measured by ____________________?
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A. thermocouple

B. thermometer

C. thermistor

D. thermopile

E. radiatiouv pyrometer

8. A non-dimensional number generally associated with natural convection heat transfer is________________?
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A. Reynold number

B. Prandtl number

C. Weber number

D. Nusselt number

E. Grashoff number

9. Thermal diffusivity of a substance is ____________________?
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A. proportional to (k)

B. inversely proportional to k

C. none of the above

D. inversely proportional to k2

E. proportional of thermal conductivity

10. When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by ___________________?
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A. radiation

B. convection and radiation

C. conduction

D. conduction and convection

E. convection

11. The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________?
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A. transmissivity

B. reflectivity

C. absorptivity

D. intensity of radiation

E. emissivity

12. In heat exchangers, degree of approach is defined as the difference between temperatures of________________?
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A. cold water inlet and outlet

B. hot medium outlet and cold water outlet

C. hot medium inlet and outlet

D. hot medium outlet and cold water inlet

E. none of the above

13. The ratio of heat flow Q1/Q2 from two walls of same thickness having their thermal conductivities as ATj 2K2 will be ________________?
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A. 0.25

B. 0.5

C. 2

D. I

E. 4

14. Emissivity of a white polished body in comparison to a black body is________________?
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A. higher

B. depends upon the shape of body

C. same

D. lower

E. none of the above

15. Thermal conductivity of glass-wool varies from sample to sample because of variation in ________________ ?
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A. structure

B. porosity

C. density

D. all of the above

E. composition

16. Thermal conductivity of air at room temperature in kcal/m hr C is of the order of__________________?
0

A. 0.5

B. 0.02

C. 0.002

D. 0.1

E. 0.01

17. Thermal conductivity of water in general with rise in temperature ____________________?
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A. increases

B. decreases

C. remains constant

D. may increase or decrease depending on temperature

E. none of the above

18. The amount of heat flow through a body by conduction is_______________?
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A. all of the above

B. dependent upon the material of the body

C. directly proportional to the temperature difference on the two faces of the body

D. directly proportional to the surface area of the body

E. inversely proportional to the thickness of the body

19. In counter flow heat exchangers_________________?
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A. both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state

B. both the fluids at inlet are in their hottest state

C. both the fluids .at exit are in their hottest state

D. one fluid is in hottest state and other in coldest state at inlet

E. any combination is possible depending on design of heat exchanger

20. Thermal conductivity of a material may be defined as the________________?
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A. heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

B. quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1C

C. quantity of heat flowing in one second through one cm cube of material when opposite faces ^re maintained at a temperature difference of 1C

D. all of the above

E. none of the above

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