ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 13 
122. State the best values of the pole are ratio for alternate pole 
and equipole alternators. 
123. A two-phase alternator has a pole are ratio of .66 and a coil 
breadth ratio of ¥#. State the value of the form factor 
of this machine. 
124. A two-phase alternator with 64 poles has an armature 
containing 256 slots. The pole are is 5 inches and the pol2 
pitch 8.3 inches. What will be the value of the form 
factor of this alternator? 
125. Caleulate the useful armature flux which is required to 
generator a phase pressure of 3,500 volts at the terminals 
of the two-phase alternator for which the open circuit 
characteristic is caleulatetd in Example 23, Par. 178 of 
the Instruction Book. 
126. State the formula which has been applied for the calculation 
of the leakage factor, in the example given in Example 23, 
Par. 178 of the Instruction Book. 
12%. What tooth thickness should be inserted in the formula, and 
give the section of same? 
Printed in U.S. A. 
