Regarding one dimensional heat transfer, choose the correct statement
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.
Which statement is true regarding steady state condition?
Heat influx is always equal to heat efflux. It is a function of space coordinates only.
Which of the following is an example of steady state heat transfer?
System is a perfect black body.
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?
Ambient temperature is uniform on the periphery of cylinder and temperature is uniform. So it takes place in radial direction only.
Heat transfer takes place according to which law?
Second law states about heat transfer between source and sink.
Heat transfer takes place in liquids and gases is essentially due to
Convection is a process by which thermal energy is transferred between solid and fluid flowing through it.
The appropriate rate equation for convective heat transfer between a surface and adjacent fluid is prescribed by
The rate equation used to describe the mechanism of convection is called Newton’s law of cooling when the solid surface is cooled by fluid.
Identify the wrong statement
Heat flows from higher to lower temperature.
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?
Heat transfer by radiation can occur between two bodies even when they are separated by a medium colder than both of them.
Most unsteady heat flow occurs
Under steady state condition, with time there is a change in temperature i.e. temperature field is a function of space and time.