Heat Transfer Basics Mcqs
This set of Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Heat Transfer ”. These Mcqs are chosen from a collection of most authoritative and best reference books on Chemical Engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Heat Transfer comprehensively.
17. In general the thermal conductivity of a non-homogeneous material
Decreases with increasing temperature
Decreases with increasing apparent bulk density
Increases both with increasing temperature and increasing apparent bulk density
Increases with increasing temperature but decreases with increasing apparent bulk density
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18. The thermal conductivity of engine oil (unused)
Is greater than the thermal conductivity of water at the same temperature
Remains unaffected with change in temperature
Decreases with increase in temperature
Increases with increase in temperature
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19. The thermal conductivity of a perfect heat insulator is
Zero
Infinity
One
Between zero and infinity
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20. The conductance is
Directly proportional to the resistance to heat flow
The reciprocal of the resistance to heat flow
Directly proportional to the thermal potential difference
The reciprocal of the thermal potential difference
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21. The conductance has the units of
W/m2
W/K
W/(m.K0
1/k
22. The thermal diffusivity of a material is defined as
K/(pCp)
(pCp)/k
(kCp)/p
(kp)/Cp
23. The units of the thermal diffusivity of a material are
M2/K
S/m2
W/(m2.K)
M2/s
24. The thermal diffusivity of a material is the ratio of
The thermal conductivity to the thermal capacity of the material
The thermal capacity to the thermal conductivity of the material
The thermal conductivity to the specific heat of the material
The thermal conductivity to the density of the material
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25. The thermal diffusivity of a material is important in the analysis of problems involving heat transfer by
Radiation
Natural convection
Condensation
Conduction
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26. The resistance to heat flow by conduction is
Directly proportional to the material thickness
Inversely proportional to the material density
Inversely proportional to the area normal to the direction of heat transfer
All of these answers
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27. If the thermal conductivity of a wall material varies linearly with temperature the steady state temperature distribution in the very large thin plane wall having steady uniform surface temperature follows
Linear law
Parabolic law
Logarithmic law
Hyperbolic law
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28. The thicker the insulation the less is the total heat lost. This statement is
Always true for flat insulation only
Always true for curved insulation only
Always true for both flat and curved insulation
Not true for both flat and curved insulation
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29. If the thermal conductivity of a wall material is independent of temperature the steady state temperature distribution in the very large thin plane wall having steady uniform surface temperatures follows
Hyperbolic law
Parabolic law
Linear law
Logarithmic law
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30. The maximum heat loss from pipe occurs when the critical radius equals
The ratio of the surface coefficient of heat transfer to the thermal conductivity of the insulation
The ration of the thermal conductivity of the insulation to the surface coefficient of heat transfer
The product of the thermal conductivity of the insulation and the surface coefficient of heat transfer
The radius of the pipe
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