Electrical Design & Estimation Engineer Interview Questions and Answers

A circuit breaker is a device that automatically interrupts an electrical circuit to protect against overcurrent or short circuit faults.

• Circuit breakers are used to protect electrical circuits from damage caused by excessive current flow.

• There are different types of circuit breakers, such as thermal, magnetic, and thermal-magnetic circuit breakers.

• Relays are electromagnetic switches that control the operation of circuit breakers.

• The working principle of a circuit breaker inv...read more

Damper windings are used in induction motors to provide starting torque and improve motor performance.

• Damper windings are short-circuited conductors placed in the slots of the rotor of an induction motor.

• They are made of copper or aluminum and are connected to the rotor bars.

• The purpose of damper windings is to provide starting torque and improve the motor's performance.

• When the motor is started, the rotating magnetic field induces currents in the damper windings, creating a ...read more

Ampere's Law relates the magnetic field around a closed loop to the current passing through the loop.

• Ampere's Law states that the magnetic field around a closed loop is proportional to the current passing through the loop.

• It is one of Maxwell's equations in electromagnetism.

• The law is often used to calculate the magnetic field produced by current-carrying conductors or solenoids.

• Ampere's Law can be written in integral form as ∮B⋅dl = μ0I, where B is the magnetic field, dl is ...read more

Sag line is the lowest point on a transmission line where the conductor sags due to its own weight.

• Sag line is the lowest point on a transmission line.

• It occurs when the conductor sags due to its own weight.

• Sag in the line is important to consider for proper design and estimation.