UTILITY PROJECTS AND SERVICES Electrical Technician Interview Questions, Process, and Tips

Star delta contactors are used in electrical systems to control the starting and stopping of three-phase motors.

• Star delta contactors are used to reduce the starting current of three-phase motors.

• They are commonly used in industrial applications where large motors are used.

• The contactors switch the motor windings from a star configuration to a delta configuration.

• This reduces the voltage across each winding and limits ...read more

There are two main types of motors: AC motors and DC motors.

• AC motors: synchronous and asynchronous

• DC motors: brushed and brushless

• Other types: stepper motors, servo motors, linear motors

• Motors can also be classified by their power source, size, and application

APFC panel is used in industries to improve power factor and reduce energy consumption.

• APFC panel helps in maintaining a high power factor which reduces energy consumption and saves money.

• It also helps in reducing voltage drops and improves the efficiency of electrical equipment.

• APFC panel is commonly used in industries with high power consumption such as steel plants, cement factories, and chemical plants.

• It can also ...read more

There are several types of motor protection relays used in electrical systems.

• Motor overload protection relays

• Motor thermal protection relays

• Motor phase loss protection relays

• Motor short circuit protection relays

• Motor underload protection relays

• Motor earth fault protection relays

• Motor stall protection relays