THE DESIGN OF ALTERNATING 
GENERATORS AND SYNCHRONOUS 
128. 
129. 
130. 
131. 
132. 
133. 
134. 
135. 
136. 
MOTORS. 
State the different problems which present themselves in 
the design of alternators. 
State the principal item which influences the economical 
application of material for a certain regulation. 
What is the flux value per pole of a 150 KVA. alternator, 
running at a speed of 600 revs. per minute and generating 
a current at 60 cycles? 
Give the modified symbolical expression of the fundamental 
Equation (33), indicated in Par. 165 of the Instruc- 
tion Book. 
What is understood by the peripheral density of an alter- 
nator? State the symbolical expression for same. 
A 400 KVA. star-connected three phase alternator, running 
at a speed of 500 revs. per minute and generating a line 
pressure of 3,500 volts, has an armature bore of D = 55 
inches and 432 armature conductors per phase. Calculate 
the peripheral density of this alternator. 
What does the choice of the diameter of the alternator 
according to its peripheral density take into consideration ? 
What is the peripheral density of a 600 KVA. 50-cyele 
polyphase alternator? 
What would be the peripheral density of the alternator 
given in Question 135 when generating a current at 25 
cycles? 
