upto how much low RPM we will run the commercial motor
which is run through VFD without any problem occurs in
motor.Motor rating Duty is S1 & RPM is 1400.

How can we calculate the power factor of an electrical
appliance ?
Is there any formula ? Is there any meter around to
calculate it ? And how to use that meter ? thanks

what will happens if one phase is missing for 33/11kv power
transfomer and why?

1003

how to measure dc earth leakage current?

1240

How can claculate to attain the desired PF in the line (
HOW Much KVAR is required ) Pls Give the formula? Equate
Petrochemical 0 1
how to calculate sizing of NGTR (Transformer rating,Loading
resistor value and Current rating of resistor) and what is
the X/R ratio. Details : 11kV,Capacitance 1.73532 micro
farads,40kA for 1sec. 0 1
What will happened. if we feed 3phase supplay to the stater
with out insert the rotor. How much current will flow
through the stater winnding? Equate Petrochemical 0
1
What is required of exietation to the alternater. 0
1
why star point of HT motor not earthed? Equate
Petrochemical 0 1
Why we are getting low voltage in star connection? Equate
Petrochemical 0 2
What's ND relay & it's functions? Equate Petrochemical
0 2
How instantanious short circuit current is calculated? its
formula? Equate Petrochemical 0 2
What is servo Motor? What's the advantages of this motor
over Induction motor? Equate Petrochemical 0 2
What is core CT & it's function? Equate Petrochemical 0
3
what is meant by star/delta voltages as 440/220 in a 3
phase induction motor, and why it should be connected on
STAR IN 3 PHASE SUPPLY L & T 0 4
What is required of exietation to the alternater. KNB 1
23
what is the design voltage for 6.6KV 2000 KVAR HT
capacitor? Consultancy 0 3
Pls explain about vfd control?Where it is used, Give some
example? siemens 1 22
Please explain me abt PQ diagaram in the power sector.
0 9

397

which IS or IEC is used for earthing,breakdown voltage of
transformer oil, hv/pd testing and all type of electrical
testing

885

WANTCONTACT NUMBER & EMAIL/ WEBSITE TO CONTACT THE
SECRETARY,MADHYA PRADESH LICENSING BOARD(ELECTRICAL),K-
BLOCK,3RD FLOOR,SATPOODA BHAWAN,BHOPAL

403

Help need in transformer !?
Hello Friends
The parameters of 2300/230 v 50hz t/f is
R1=0.286 ohm R`2=0.319 ohm Rc=240 ohm
X1=0.73 ohm X`2=0.73 ohm Xm=49.2 ohm
Secondary Load impedance ZL=0.387+J0.29
solve the exact equivalent circuit with normal voltage
across primery..
I know every thing but i cant find CURRENT I1=? and I`2=?
Please help me give solution or only Formula please please...

326

if 12v battery get discharged for 2 months after if we put
charge it will charge again?how much time it will take to
charge?

260

how to interlock 3 incomer-ACB,1 buscoupler ACB,...
pls answer this question and if possible send me the ckt diagram..haifriends2910@gmail.com

553

Hi
Suppose we have a wye/wye transformer which is grounded at
both sides,in this situation, do we have ay ground
transformer? in other words, ground transformer can do any
thing more (while we have nuetral wire in both sides)? As
the last question, what about 3rd harmonic? we have two
choices: first using wye/delta transformer + ground
transformer and second using wye/wye earthed connection.in
the former choice, we dont have 3rd harmoonic at the
secondary side but what about Yn/yn conection? do we suffer
from 3rd harmonic in the Yn/yn connection?

319

in conventional fan regulators how the current varies with
speed?

324

A generating system will have a total capacity of 300 MW. Find the probable forced outage when the capacity is supplied by two 150 MW units. The operating probability of all units is P=0.98 and forced outage probability rate Q =0.02 .

4

why T/F winding temp measurement cts are odd secondary current ie,109A/1.2A/1.4A?

26

What is Servo Ventilated Motor?

381

can you send me the placement papers of electrical engg.
from companis like NTPC,DRDO,IOCL,HPCL,BPCL etc.?If,plz send
as soon as possible.Thanks.

415

What is the importance of counter based plan & how is it
scheduled?