If a transformer primary winding operates at 240v, the
secondary at 120v and the load is 1500w & the transformer
is rated at 92% efficient, what's the current flowing
through the primary winding of the transformer? What is the
formula for finding this?
We have .ht motor which is 60Hz.we run on 50Hz.so that it's speed reduce
but we had one prob.that motor winding temp increase up to 135 deg.we
want reduce this temp.what to do?we arrange ext.cooling fan but not much
effect.we want reduce this temp. Inhouse without affecting much.cost. also
don't want reWINDING OF MOTOR?
For these 2 devices what their power ratings are ?
1) single phase : AC 220V & starting amps 3Amps (i.e.
starting torque) and the stabilized amps 2A ... For deep
2) single phase : AC 220V & starting amps 2.7Amps (i.e.
including the starting torque of a CRT monitor) and the
stabilized amps 1 Amps
explain the what is a drive ? 0 4
which type motor r use in the celling fan..... PCB
plannet 2 13
If stator & rotor of a 3-phase induction motor have
different no. of poles, will the motor run or not??
types of drives Why dc supply is used for closing and
tripping coil of ht breakers. What happen if we use only
ups ac supply only. ACC 1 41
how the 3phase induction motor is running in 2phase supply
with help of capacitor? 1 33
what is the actual difference betwen constructional details
and constructional features? 1 20
how does commutator convert a.c to d.c?
where this neutral connection goes after returning from the
load(home ,factory,industries).Is it grounded at the
transformer side or atthe generator side .If it is grounded
then we also ground the earth connection.is there any
problem with this.