Answer Posted / birla cellulosic, kharach
Inrush current in any inductive circuit is due to absence
of back emf and back emf is created by secondary circuit as
in case of motor and transformer. this back emf creates a
counter flux which opposes the main flux so when any
transformer is charged its back emf is absent initially so
primary will take excess current because there is no flux
to oppose it so we can say its total impedence is low
initially after some cycles back emf (counter emf) is
created which opposes the main flux and hence flow of
current decreases to its normal. in case of motor its rotor
is short circuited so when rotating magnetic field is
stablished it generated emf in rotor and since rotor is
stationary initially rate of cut of magnetic field is
maximum and so the generated emf in rotor is more initially
so large current will flow in short ckted rotor and since
it is like secondary cirkt of motor, so stator will also
take more current. when rotor starts rotating its relative
speed gap starts decreasing and hence rotating flux cutting
rotor will decrease so emf induced in rotor will decrease
and so the rotor current will decrease and stator current
will also decrease becoz it act like primary winding of
transformer and when rotor achieve its full speed current
will become normal.
| Is This Answer Correct ? | 2 Yes | 1 No |
Post New Answer View All Answers
how much GROUND & NEUTRAL VOLT maintain in data center.
On what cycle does thermal power plant operate?
I have doubt that the supply HZ (very low or high than rated ) may affect the power factor. is it true. ?
What is earth?
Give the expression for the frequency of oscillations in an op-amp sine wave oscillator?
whit is 33kv power 300*300 cable full current with formula
Is a 300w induction motor used in a food processor as powerful as a 1000w DC motor.
Transformer cores are laminated in order to A simplify its construction B minimize eddy current loss C reduce cost D reduce hysterisis loss
Discuss about gear cutting machines.
what are the differences between 'exhaust fan', 'heavy-duty exhaust fan' & 'super heavy duty exhaust fan'. what are their power ratings ?
USE OF 8 WAY PAN ASSEMBLY
1. what is usage for power factor in industries?? 2.why we need to monitor power factor??
how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?
how can we find thae value of capacitor for single phase motor. what is difference between starting capacitor and running capacitor.
any idea abt REVERSE METERING concept.........?
