Sterlite Power Electrical Maintenance Engineer Interview Questions and Answers

Power factor improvement involves reducing reactive power and increasing active power to improve efficiency.

• Power factor is the ratio of active power to apparent power

• Improving power factor reduces energy costs and improves system efficiency

• Methods for improving power factor include capacitor banks, synchronous motors, and static VAR compensators

3-phase induction motor slip ring and squirrel cage motor differ in rotor construction and starting torque.

• Slip ring motor has external resistors and brushes to control rotor current and torque, while squirrel cage motor has a simple rotor with copper bars.

• Slip ring motor has high starting torque and is used in heavy load applications like cranes and elevators, while squirrel cage motor has low starting torque and is u...read more

Slip ring motors use external resistors for starting and speed control, while squirrel cage motors rely on the number of poles and frequency for speed control.

• Slip ring motors have external resistors that are gradually removed to increase speed

• Squirrel cage motors rely on the number of poles and frequency for speed control

• Slip ring motors are used in applications where high starting torque is required

• Squirrel cage moto...read more

AC and DC are two types of electrical current. AC stands for alternating current and DC stands for direct current.

• AC is the type of current commonly used in homes and businesses, while DC is used in batteries and electronic devices.

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

• AC current can be easily converted to different voltages using transformers, while DC current requires a co...read more