Electrical Machines Questions and Answers_pag170

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d) 
View Answer 
Answer: a 
Explanation: There will be linear relation in Ef and Ia as mmf required is zero. 
6. Phasor diagram below is best describing the 
 
a) Open circuit characteristic of alternator 
b) Short circuit characteristic of alternator 
c) External circuit characteristic of alternator 
d) Internal circuit characteristic of alternator 
View Answer 
Answer: a 
Explanation: Graph of Ef vs Ff is the open circuit characteristic of the machine. 
7. The short circuit characteristic of alternator is a straight line due to 
a) no saturation