Nilkamal Furniture Electrical Engineer Interview Questions and Answers

VFD stands for Variable Frequency Drive. It is an electronic device that controls the speed of an AC motor.

• VFDs are used to save energy and improve motor control

• They can be used in HVAC systems, pumps, and fans

• VFDs work by adjusting the frequency of the electrical supply to the motor

• They can also provide overload protection and soft start/stop functions

Power factor is the ratio of real power to apparent power in an AC circuit.

• Power factor is a measure of how efficiently electrical power is being used.

• It ranges from 0 to 1, with 1 being the most efficient.

• A low power factor can result in increased energy costs and decreased equipment lifespan.

• Capacitors can be used to improve power factor.

• Power factor is important in AC circuits, but not in DC circuits.