Oral exam guide FAA PPL checkride. Icing.

One of the hazards in flight is aircraft icing.
You as the PIC Pilot in command should be aware of the conditions that is most likely to generate aircraft icicng.
This includes

Types of icing

The effects of icicng on aircraft control and performance

The use and limitations of aircraft deice and anti-ice equipment

In order for ice to form there must be moisture present in the air, and the air must be cooled to a temperature of 0 degrees Celsius or less.

Aerodynamic cooling can lower the temperature of an airfoil to 0 degrees Celsius even if the ambient temperature is warmer than 0.

Ice is identified as 

Clear

Rime

Mixed

Rime ice forms if the droplets are small and freeze immediately when contacting the aircraft surface.
Rime ice usually forms on areas such as the leading edges of wings and struts.

Clear ice is usually formed from larger water droplets or freezing rain that can change the shape of the airfoil.

And mixed ice is a mixture of clear and rime ice, it has the characteristics of both clear, and rime ice, it forms rapidly.