General Awareness Questions

Q.  D.C Series motor never operated on

a. Full Load
b. Half Load
c. No Load
d. At any Load


ANSWER: See Answer
 
D.C series motor both armature and field connected in series at no-load condition current drawn by the motor is zero Ia=0 flux also zero. but a very small amount of flux available because of residual magnetism

in series motor speed = N α Eb/Φ Eb almost constant

= N α 1/Φ

At no-load condition, d.c series can be run as dangerously very high so d.c series motor
operated at load condition only
 

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