But, that doesnât mean students have to take them all in the same week. Our class structure allows us to provide 5 cycles of classes for every 30-day period. As long as students take the classes in order, (Class 1, Class 2, Class 3, Class 4), they are free to switch between any of the cycles for that 30-day period. The only other requirement is that all 4 classes must be completed within 30 days of the first class.
Re: Advantages of three phase systems over single phase. The big advantage with 3 phase mains is that any electric motor connected to it is more efficient, has smother running and uses less parts so is more reliable. There is also a slight advantage in using 3 phase transformers over single phase ones.
Most of the electric power is generated and distributed in three-phase. Operating frequency 50Hz (Europe) or 60Hz (US). 2. The instantaneous power in a three-phase system can be constant (not pulsating!). 3. For the same amount of power, the three-phase system is more economical that the single-phase.4. In fact, the amount of wire required for a three-phase system is less than that required for an equivalent single-phase system.or the same amount of power, the three-phase system is more economical that the single-phase. 4. In fact, the amount of wire required for a three-phase system is less than that required for an equivalent single-phase system.