What does Fourier’s law describe?
A Conduction
B Boiling
C Convection
D Radiation
Which method of heat transfer requires a medium?
A None
B Convection
C Radiation
D Conduction
What increases heat transfer in a heat exchanger?
A Flow rate
B Temperature difference
C Insulation
D Surface area
What is the primary role of fins in heat exchangers?
A Insulate
B Increase heat loss
C Increase surface area
D Decrease heat flow
What does thermal conductivity measure?
A Heat capacity
B Heat flow resistance
C Heat transfer rate
D Heat absorption
Which of the following describes radiation?
A Heat transfer by molecular motion
B Heat transfer through solid contact
C Heat transfer in a fluid
D Heat transfer through electromagnetic waves
What does the heat transfer coefficient quantify?
A Rate of heat transfer
B Rate of convection
C Rate of conduction
D Rate of radiation
In which process is latent heat involved?
A Conduction
B Freezing
C Boiling
D All of the above
What does thermal resistance oppose?
A Heat flow
B Thermal expansion
C Energy storage
D Temperature gradient
What happens when the temperature gradient increases?
A Resistance decreases
B Heat transfer increases
C Heat transfer decreases
D No change
How does the Stefan-Boltzmann law relate to heat transfer?
A Describes conduction
B Describes phase change
C Describes radiation
D Describes convection
What is the effect of insulation in thermal systems?
A Prevents heat loss
B Increases heat loss
C Reduces efficiency
D Decreases temperature gradient
What is the effect of increasing the fluid velocity in convection?
A Reduces pressure
B Decreases heat transfer
C Increases heat transfer
D No effect
What happens to heat transfer when the surface area decreases?
A Increases resistance
B No change
C Decreases
D Increases
What happens during the process of condensation?
A Solid turns into liquid
B Gas turns into liquid
C Gas turns into solid
D Liquid turns into gas