Quiz on Chapter 1

The science of heat transfer differs from the science of

thermodynamics because it _____ . 

• deals with the amount of heat transfer as a system undergoes a process from one equilibrium state to another

• determines the thermal conductivity of a material

• describes the spectrum of blackbody radiation, which depends only on the object's temperature

• deals with the rate of heat transfer as well as the temperature distribution within the system at a specified time

A huge rock at the state park gets really hot during the day because of

• conduction

• convection

• radiation

Near the ceiling of a room the air is warmer. The warm air rises because of...

• conduction

• convection

• radiation

How does the thermal conductivity of a material change with respect to change in the temperature of the same material?

• thermal conductivity of a material increases with an increase in its temperature

• thermal conductivity of a material decreases with increase in its temperature

• thermal conductivity of a material remains same with change in its temperature

• unpredictable

Why is the negative sign introduced in the equation of Fourier's law of heat conduction?

q = – kA (dT / dx)

• because value of thermal conductivity k is negative

• because heat transfer rate is inversely proportional to temperature gradient

• to ensures that heat transfer in the positive x direction is a positive quantity

• none of the above

The rate equation used to describe the mechanism of convection is called

• Stefan Boltzmann's Law

• Newton law of cooling

• Fourier law

• Kelvin-planck law

Rate of heat flow by convection doesn’t depend on

• Convective heat transfer coefficient

• Surface area through which heat flows

• Time

• Temperature difference

Convective heat transfer coefficient doesn’t depend on

• Surface area

• surface geometry

• nature of

  fluid motion

• bulk fluid velocity

• properties of the fluid