The magnetic field in a DC machine may be supplied by permanent magnets in small units. Large DC machines use field poles that are essentially
a) insulators
b) resistors
c) non-magnetic
d) flux resistant
e) electromagnets
Answer: E
The magnetic field in a DC machine may be supplied by permanent magnets in small units. Large DC machines use field poles that are essentially
a) insulators
b) resistors
c) non-magnetic
d) flux resistant
e) electromagnets
Answer: E