it does not require any maintenance
the generated D.C. remains completely isolated from the A.C.
its efficiency is very high
none of these
single-phase type only
three-phase type only
single or three phase type
both single and three phase type
d.c. supply
a.c. supply
mechanical power
either of the above three
mercury vapour lamp
arc lamp
sodium vapour lamp
fluorescent lamp
Generator
Alternator
Transformer
Rectifier