Answer / srij21

It is the requirement of the machine.we can either operate
in 440 or 220 or even in 110 volts.The voltage depends upon
the motor,circuit and other loads related with the machine.

Answer / krish

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insulation requrement will decreases.
hence reduction in cost of machine.

if requrement is 440 v then using costly machine is
preferrable.

Answer / ginijayaram

please connect one end of the same watts lamp in each phase
and other end of the lamps connect common point . then take
that point is zero potential. and take one phase in one lamp
side.that two points give to 220 vols in machine

Answer / ashutosh

b/c if voltage decreases therefore the current is increases
due to p=v*i & hence if current is increases therefore the
magnetic flux will also increases & hence there is good
magnetic strength will occurs

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