Heat Transfer Mcqs

This set of Mechanical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Heat Transfer ”. These questions are chosen from a collection of most authoritative and best reference books on Mechanical 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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1.
Unit of thermal conductivity in S.I. units is__________________?

J/m2 sec

J/m °K sec

W/m °K

A. and C. above

B. and C. above

Answer Discus (0)

2.
Heat transfer in liquid and gases takes place by_____________________?

Conduction

Convection

Radiation

Conduction and convection

Answer Discus (0)

Pick up the wrong case?

3.
Heat flowing from one side to other depends directly on ___________________?

Pick up the wrong case?

face area

time

Thickness

temperature difference

thermal conductivity

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4.
Which of the following is the case of heat transfer by radiation ___________________?

Blast furnace

Heating of building

Cooling of parts in furnace

Heat received by a person from fireplace

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5.
Which of the following is a case of steady state heat transfer ___________________?

I.C. engine

Air preheaters

Heating of building in winter

All of the above

None of the above

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6.
Thermal conductivity of water in general with rise in temperature ____________________?

Increases

Decreases

Remains constant

May increase or decrease depending on temperature

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

Thermometer

Radiatiouv pyrometer

Thermistor

Thermocouple

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8.
Metals are good conductors of heat because________________?

Their atoms collide frequently

Their atoms-are relatively far apart

They contain free electrons

They have high density

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9.
Cork is a good insulator because it has___________________?

Free electrons

Atoms colliding frequency

Low density

Porous body

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10.
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of__________________?

0.002

0.02

0.01

0.1

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11.
Thermal conductivity of air with rise in temperature__________________?

Increases

Decreases

Remains constant

May increase or decrease depending on temperature

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12.
Total heat is the heat required to__________________?

Change vapour into liquid

Change liquid into vapour

Increase the temperature of a liquid or vapour

Convert water into steam and superheat it

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14.
The time constant of a thermocouple is_______________?

The time taken to attain the final temperature to be measured

The time taken to attain 50% of the value of initial temperature difference

The time taken to attain 63.2% of the value of initial temperature difference

Determined by the time taken to reach 100°C from 0°C

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15.
In heat transfer, conductance equals conductivity (kcal/hr/sqm/°C/cm) divided by ________________?

Hr (time)

Sqm (area)

°C (temperature)

Cm (thickness)

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