Electrical Machines Questions and Answers_pag168

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Answer: a 
Explanation: Hysteresis effect causes the flux to be lagging in nature. 
3. The internal power factor angle Ψ is between 
a) Ef and Ia 
b) Ia and field flux 
c) Ef and Vt 
d) Vt and Ia 
View Answer 
Answer: a 
Explanation: 
 
4. The load angle δ is between 
a) Ef and Ia 
b) Ia and field flux 
c) Ef and Vt 
d) Vt and Ia 
View Answer 
Answer: c 
Explanation: It is the angle between excitation voltage and the terminal voltage. 
5. If it is assumed that the iron part of magnetic circuit requires zero mmf, relation between Ef 
and If will be