1. Which of the following is an example of latent heat exchange? a. Evaporation b. Solidification c. Condensation d. Sublimation

2. What do you call the transfer of thermal energy when the flow is caused by external means? a. Forced convection b. Natural convection c. Conduction d. Radiation

3. which of the following statement is incorrect according to heat transfer? a. Heat flow doesn't depend on temperature b. A material medium is not necessary for heat transmission c. The process of heat transfer is an irreversible process d. For heat exchange, a temperature gradient must exist