Monday, 2 January 2012

Electrical Engineering Interview Questions-Part6




What r the advantage of selecting micro controller type tripping of circuit breaker than relay type tripping?

What is the meaning of BUS?

In step down transformer (415/200V), mistakenly secondary side is connected to 415V for some hours, what would be result of this condition?

What is the difference between negative dc voltage and positive dc voltage because 
some circuit uses -24,-5,-12,- 15,volt dc

If any lead acid battery is having low or high sp.gravity then what will be effect of battery and why?


In Airplane what circuitry or method use for earthing?
What is the diff. between two phase & three phase supply?

What is the reason for balance of voltage in magnetic balance test?

How can we measure and monitor critical performance parameters of Diesel Generator Sets, both electrical and engine?

How can you prove that in CE configuration a transistor has 180 degree phase shifted output?

What do you mean by 1 ton in AC`s?

Procedure for conducting vector group test on power transformers. Why it is conducted? How to increase the specific gravity of DG batteries?

What is mean CT Saturation? How to calculate?

There are 2 Flip-flop with logic between them. Given Clock to Q delay, logic prop. Delay, 
set up and hold times specify maximum clock frequency of system. What happens if 
second output fed back to first input. Any changes? What happens with timing if second 

output is fed back to logic between the flops?

What is difference between start imitation and start interlock for 3 phase motor protection?

Why for transformer protection we protect transformer from 3rd harmonics and 5th harmonics and what is the reason of generating these harmonics in electrical system?

What is the difference between Induction motor and servo motor?

How to calculate the size of the conductor for particular load?

Why heat produced at junction of two different conductors. What care should be taken to minimize it?

How much %age of corona losses increases if frequency is increased to 25%?





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