1 - Question

Regarding one dimensional heat transfer, choose the correct statement.

Explanation: In case of one dimensional heat flow steady state is a function of x coordinate only while unsteady state is a function of x coordinate and time only.

2 - Question

Which statement is true regarding steady state condition?

a) There is a variation in temperature in the course of time<br/>
b) Heat exchange is constant<br/>
c) It is a function of space and time coordinates<br/>
d) Internal energy of the system changes

Explanation: Heat influx is always equal to heat efflux. It is a function of space coordinates only.

3 - Question

Which of the following is an example of steady state heat transfer?

a) Boilers and turbines<br/>
b) Cooling of I.C engine<br/>
c) Chilling effect of cold wind on a warm body<br/>
d) Electric bulb cools down by the surrounding atmosphere

Explanation: System is a perfect black body.

4 - Question

Heat transfer in a long, hollow cylinder which is maintained at uniform but different temperatures on its inner and outer surfaces may be assumed to be taking place in which direction?

a) Axial only<br/>
b) Unpredictable<br/>
d) No heat transfer takes place

Explanation: Ambient temperature is uniform on the periphery of cylinder and temperature is uniform. So it takes place in the radial direction only.

5 - Question

Heat transfer takes place according to which law?

a) Newton’s law of cooling<br/>
b) Second law of thermodynamics<br/>
c) Newton’s second law of motion<br/>
d) First law of thermodynamics

Explanation: Second law states about heat transfer between source and sink.

6 - Question

Heat transfer takes place in liquids and gases is essentially due to

b) Conduction
c) Convection
d) Conduction as well as convection

Explanation: Convection is a process by which thermal energy is transferred between solid and fluid flowing through it.

7 - Question

The appropriate rate equation for convective heat transfer between a surface and adjacent fluid is prescribed by

a) Newton’s first law<br/>
b) Wein’s displacement law<br/>
c) Kirchhoff’s law<br/>
d) Newton’s law of cooling

Explanation: The rate equation used to describe the mechanism of convection is called Newton’s law of cooling when the solid surface is cooled by the fluid.

8 - Question

Identify the wrong statement

a) The process of heat transfer is an irreversible process<br/>
b) For heat exchange, a temperature gradient must exist<br/>
c) A material medium is not necessary for heat transmission<br/>
d) Heat flow doesn’t depend on temperature

Explanation: Heat flows from higher to lower temperature.

9 - Question

During a cold winter season, a person prefers to sit near a fire. Which of the following modes of heat transfer provides him the maximum heat?

a) Conduction from the fire<br/>
b) If it is near the fire, convection sounds good<br/>
d) Radiation will provide quick warmth

Explanation: Heat transfer by radiation can occur between two bodies even when they are separated by a medium colder than both of them.

10 - Question