Answer / sakthivel perambalur

merits : 1, constant speed
2, to improve the power factor

demerits: 1, high cast
2,special application only

Answer / manoj9550336681

Merits:
Constant Speed.
De-Merits:
Requires Extra DC Supply for excitation.

Answer / ckp

M.-Motor rotates dm-no noise

Answer / deeksha jain

merit:for power factor improvement ,as a
"synchronous capacitor"
demerit:not self starting

Answer / mahesh katakdhond

MERITS

1.Run in Synchronous speed.
2.If load changed then run either synchronous speed or zero speed(magnatic locking).

DEMERITS

1.Not self start.
2.High cost.

is earthing is necessary if we use armoured cable

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