Multi Skill Operator Interview Questions and Answers

AC current changes direction periodically, while DC current flows in one direction only.

• AC current alternates direction at a certain frequency (e.g. 60 Hz in the US)

• DC current flows in one direction continuously

• AC current is used in household electricity, while DC current is used in batteries

• Examples: AC - power outlets, DC - car batteries

Relay function differs in AC and DC systems due to the type of current they handle.

• AC relays are designed to handle alternating current, while DC relays are designed for direct current.

• AC relays have a higher current rating compared to DC relays.

• DC relays are typically faster in operation than AC relays.

• AC relays are more commonly used in household appliances, while DC relays are used in automotive applications.