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.

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16.
The thermal conductivity of copper

Remains unaffected with change in temperature

Increases with increase in temperature

Decreases with increase in temperature

Is less than the thermal conductivity of aluminium at the same temperature

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

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

19.
The thermal conductivity of a perfect heat insulator is

Zero

Infinity

One

Between zero and infinity

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

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

25.
The thermal diffusivity of a material is important in the analysis of problems involving heat transfer by

Radiation

Natural convection

Condensation

Conduction

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

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

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

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

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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