Friday, December 30, 2011

Electrical Interview questions Part 6

Electrical interview question:Why syn. generators r used for the production of electricity?
Answer:synchronous machines have capability to work on different power factor(or say
different imaginary power varying the field emf. Hence syn. generators r used for the production of electricity.

Electrical interview question:What is the difference between synchronous generator & asynchronous generator?
Answer:In simple, synchronous generator supply's both active and reactive power but asynchronous generator(induction generator) supply's only active power and observe reactive power for magnetizing.This type of generators are used in windmills.

Electrical interview question:1 ton is equal to how many watts?
Answer:1 ton = 12000 BTU/hr and to convert BTU/hr to horsepower,
12,000 * 0.0003929 = 4.715 hp therefore 1 ton = 4.715*.746 = 3.5 KW.

Electrical interview question:why syn. generators r used for the production of electricity?
Answer:synchronous machines have capability to work on differentpower factor(or say
different imaginary pow varying the field emf. Hence syn. generators r used for the production of electricity.

Electrical interview question:Enlist types of dc generator?
Answer:D.C.Generators are classified into two types 1)separatly exicted d.c.generator 2)self exicted d.c.generator, which is further classified into;1)series 2)shunt and
3)compound(which is further classified into cumulative and differential).

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