THE DESIGN OF ALTERNATING 
GENERATORS AND SYNCHRONOUS 
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10. 
AL. 
MOTORS. 
What does the work of the dynamo designer generally include ? 
Name and describe the two classes of alternators. which differ 
only in their relative excitation arrangement. 
Give the connection diagram of (1) a separately and (2) of a 
self-excited alternator. 
State the further classification of alternators with regard to 
their relative arrangement of (1) the armature and (2) 
the field magnet system. 
Deseribe the different types of this classification. 
State the particular cases in which the revolving armature type 
alternator finds its application. 
State the advantages and disadvantages of the inductor type 
alternator ; also its principal application. 
Mention for what sizes of machines the revolving field type al- 
ternator is generally built; also state for what kind of 
work it is most suitable. 
What is the average commercial efficiency of a 500 KV A. poly- 
phase alternator for fuli and half load? 
What is the efficiency of a 500 AVA. single phase alternator 
on full and half load? 
Give the usual voltage drop of an alternator working under 
full load conditions with the different power factors of 
cos P = .8 cos & = .6 and cosy =—.1; and also define the 
voltage drop as specified above. 
