Question { L&T, 77253 }

how can we change the rotating direction of single phase AC
induction motors?

Answer

as single phase Ac induction motor are not self starting
they need capacitor to introduce phase difference.In
capacitor start and capacitor run motor(all ceiling fans) by
interchanging the leads of either capacitor or running
winding we can change the direction of rotation.

Question { 8606 }

WHAT IS THE COMPLETE DEFINATION OF POWER FACTOR?HOW IT CAN
BE IMPROVED?AND WHAT IS CAPACITIVE LOD AND INDUCTIVE LOADS

Answer

Power factor is the cosine of the angle by voltage and load
current differ.
For example if there is a load of 1KW and the power factor
is 0.8 then the actual power utilized is 800 watts.
since all household equipments like
fans,grinder,refrigerator,washing machine etc. have motors
which are inductive loads this results in low power factor,
to improve power factor capacitors are used which restore
the phase diff.

Question { Airtel, 70353 }

which type of A.C motor is used in the fan (ceiling fan,
exhaust fan, padestal fan, bracket fan etc) which are find
in the houses ?

Answer

# 1

its Single Phase induction motor which mostly squirrel
cage rotor and are capacitor start capacitor run.

Question { 13588 }

if we want to increase the back up time of an UPS what
should we do ?
if we want to decrease the charging time of a
battery/batteries attached with the UPS what should we do ?

Answer

To increase the back up of an UPS one needs to have higher AH
Rated battery.