Question 188Electricity & Electronics - QMED

70% to pass

You are attempting to parallel two AC generators, and the synchroscope pointer is revolving in the fast direction. What is the frequency of the oncoming generator relative to the bus frequency?

Athe same as the bus frequency and the circuit breaker may be closed at any pointer position

Blower than the bus frequency

Cthe same as the bus frequency but out of phase with it

Dhigher than the bus frequency

AI Explanation

The correct answer is D) higher than the bus frequency. When synchronizing two AC generators, the synchroscope pointer revolving in the fast direction indicates that the frequency of the oncoming generator is higher than the bus frequency. This is because the higher frequency generator is running ahead of the bus frequency, causing the synchroscope pointer to rotate in the fast direction. The other options are incorrect because A) the frequencies must match for the circuit breaker to be closed, C) the frequencies must match in both frequency and phase for the circuit breaker to be closed, and B) a lower frequency oncoming generator would cause the synchroscope pointer to rotate in the slower direction.