What is the Control System, and what are its different types?

Electrical and Electronic Engineering - Interview Questions

A Control System is a system where the output and inputs are interrelated so that the input parameters control the output parameters. There are mainly two types of Control Systems, i.e., Open-loop Control systems and Closed Loop Control Systems.

* Open-loop Control System : In Open-Loop Control Systems, there is no feedback from the output-input for correction.

* Closed-Loop Control Systems : In Closed Loop Control Systems, there is feedback from the output to input for correction to control the desired output quantities.

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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