Lecture 1: Heat Transfer

What is heat transfer?

• Flow of thermal energy from low-temperature reservoir to high-temperature reservoir

• Flow of energy in the form of heat from high-temperature reservoir to low-temperature reservoir

• Flow of thermal energy irrespective of reservoir temperature

• None of the above

Which of the following is the rate of heat transfer unit?

• Watt

• Pascal

• Joule

• Newton

On which of the following, convective heat transfer coefficient doesn’t depend on?

• Orientation of solid surface

• Time

• Surface area

• Space

For an opaque body

• absorptivity = 1

• reflectivity = 1

• transmissivity + absorptivity = 1

• absoptivity + reflectivity = 1

Condution heat transfer occurs in

• gas

• liquid

• solid

• all phases

How many thermodynamic laws exist?

• 1

• 2

• 3

• 4

• surface - surface

• surface - volumetric

• volumetric - volumetric

• volumetric - surface

which one is not primary unit?

• kilogram

• Kelvin

• Newton

• metre