Electrical Design Engineer Trainee Interview Questions and Answers

Earthing is the process of connecting the metallic parts of an electrical appliance to the earth plate or electrode.

• Earthing is important for safety reasons as it prevents electric shocks and fires.

• Types of earth faults include single line-to-ground fault, double line-to-ground fault, and line-to-line fault.

• Types of transformers include power transformers, distribution transformers, and instrument transformers.

• Voltage drop is the reduction in voltage that occurs when electric...read more

3 phase power formulae involve calculations for power in a 3-phase electrical system.

• The formula for 3-phase power is P = √3 x V x I x cos(θ)

• Where P is power in watts, V is voltage in volts, I is current in amps, and θ is the phase angle

• Power factor (cos(θ)) accounts for the phase difference between voltage and current

• In balanced 3-phase systems, the total power is the sum of the power in each phase

Types of motors include AC motors, DC motors, stepper motors, and servo motors.

• AC motors: commonly used for appliances and industrial applications

• DC motors: used in battery-operated devices and automotive applications

• Stepper motors: used in robotics and automation for precise control

• Servo motors: used in control systems for accurate positioning