Solve the following;
1. What is the frequency of a four-pole alternator operating at a speed of 1500 rpm?
2. An alternator is operating at 120 V with no load. A load is now applied to the generator. The voltage output
drops (the field current remains the same) to 110V. What is the regulation?
3. A 2 HP motor running at rated output acts as the prime mover for an alternator that has a load demand of
1.1 kW. What is the efficiency of the alternator in percent? Neglect field excitation.
4. A four-pole 60 Hz squirrel cage motor has a full-load speed of 1754 rpm. What is the percent slip at full load?
5. At a slip of 2.6 percent for the induction motor in problem 4, what is the rotor frequency?
6. The load of an industrial plant is 400 kVA at a pf of 75% lagging. What must be the pf of the added 100 kW
load of a synchronous motor if it improved the overall plant pf to 100%?
7. A diesel-driven 60 Hz synchronous generator produces 60 Hz when operated at 200 rpm. How many poles
does it have?
8. At what speed will a two-pole 25 Hz synchronous generator produce 25 Hz?
9. An alternator has a voltage regulation of 10%. If the full-load voltage is 220V. What is the no-load voltage?