ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 3 
i273. By means of Equation 7 of the Instruction Book, calculate the 
its A necessary number of poles. 
274. Calculate the electrical input at full load, the armature carry- 
ing a leading current of cos. p = .90. 
| 27 5. By means of Fig. 62 of the Instruction Book, determine the 
| most suitable total flux to be applied for this two-phase 
synchronous motor. 
2'%6. With two slots per pole and phase and a pole arc ratio of = 
= .60 state by means of Table 14 of the Instruction Book 
the value of the form factor which is to be applied in the 
present design. 
27 %. By means of Equation 35 of the Instruction Book, calculate 
| the necessary total number of armature conductors cor- 
responding to the flux determined. 
278. Calculate the full load current per phase and determin the 
approximate total number of armature conductors. 
279. The number of slots per pole and phase being 2, as already 
pointed out, calculate the number of conductors per slot. | 
It is to be noted that with regard to a perfect winding ar- 
rangement the next higher, even number of conductors 
per slot above that obtained by calculation is to be taken. 
280. The exact number of conductors per slot being given in 
answer to the preceding question, calculate the correctéd 
number of total armature conductors and the amount 
of conductors per phase. 
281. By means of Equation 33 of the Instruction Book, palsulate 
the corrected useful flux per pole. 
282. By means of Equation 37 and Fig. 63 of the Instruction Book, 
calculate the approximate armature bore of thie synchro: 
nous motor, 
283. The armature bore of this machine being definitely fixed at 
pyle.» D==71 inches} check; by means of Equation 38 of the In- 
