What do you understand by AVR or automatic voltage regulator?

Electrical and Electronic Engineering - Interview Questions

AVR is a short-term that stands for Automatic Voltage Regulator. It is a central part of Synchronous Generators and is used to regulate the voltage. It gets the fluctuation in the voltage and changes them into a constant voltage.

The fluctuation in the voltage generally occurs due to the variation in load on the supply system, which can damage the equipment of the power system. To control the voltage, we have to install the voltage control equipment at several places such as near the transformers, generator, feeders, etc.

Recently Updated Interview Questions in Electrical and Electronic Engineering

What are the advantages of VSCF wind electrical system?

Advantages of VSCF wind electrical system are :

* No complex pitch changing mechanism is needed.
* Aero turbine always keeps going at maximum efficiency point.
* Extra energy in the high wind speed region of the speed – duration curve can be extracted
* Significant reduction in aerodynamic stresses, which are associated with constant – speed operation.

Why electricity in India is in the multiples of 11 like 11kv, 22kv, 33kv?

Transformer Induced voltage equation contains 4.44 factor.

E=4.44*f*T*phi
E -Induced emf per phase
T -number of turns
f -frequency
phi -maximum flux per pole
From the equation we see that E is proportional to 4.4 and it is in turn multiple of 11.

So always transmission voltage is multiple of 11