Friday, 4 October 2013

Important Electrical Engineering Questions

1. What is the voltage gain or transfer function of amplifier?

2. What does the KVAR means?
The KVAR indicates the electrical power. KVAR means “Kilo Volt Amperes with Reactive components”

3. Why use the VCB at High Transmission System ? Why can't use ACB?
Actually the thing is vacuum has high arc queching property compare to air because in VCB ,the die electric strengths equal to 8 times of air . That y always vaccum used as inHT breaker and air used as in LT .

4. What is the difference between MCB & MCCB, Where it can be used?
MCB is miniature circuit breaker which is thermal operated and use for short circuit protection in small current rating circuit. MCCB moulded case circuit breaker and is thermal operated for over load current and magnetic operation for instant trip in short circuit condition.under voltage and under frequency may be inbuilt. Normally it is used where normal current is more than 100A.


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