The following data for a 1250 kVA, 0.8 p.f., 50 Hz, 3300 V, 300 rpm star connected alternator is available : Stator turns per phase = 150 = 60 Field turns per pole Effective area per pole = 0.09 m² Airgap length at pole centre = 5.5 mm Field current for full load short circuit current = 80 A = 20% of airgap ATS per pole for iron portion Assuming sinusoidal flux distribution, estimate the values of short circuit ratio and synchronous reactance.

A 60 Hz alternator stator is wye connected with each phase winding having 24 turns of wire. The rotor is supplying 0.103 Wb of flux in the center of pole face. What is the rms value of the output voltage if measured line to neutral

9.a. If a 33% load increase is suddenly applied to an alternator having a 25% reactance, the initial voltagedrop will be aboutA. 8.25%B. 13.25%C. 3.3%D. 2.5%9.b. At what speed must a four-pole alternator operate to produce a 100-cps alternating voltage?A. 3000 rpmB. 12,000 rpmC. 1500 rpmD. 6000 rpm

A synchronous generator runs at 250 rpm and generates at 50-Hz. There are 216 slots, each containing 5 conductors arranged in a full-pitched winding for 3-phase star connection. All the conductors of each phase are in series and the flux per pole at no-load sinusoidally distributed over the pole pitch is 30 mWb. Find the emf induced in each phase winding and the terminal voltage.