Answer / k.prakashchandra

AC does not have fixed polarities

Answer / k.prakashchandra

Dc is not applied continuously. It is just touch and go, to
create momentary flux.

Answer / raj

then how we are using dc on test ..dc wont step up or step
down.., hw dc is craeting current that was shown in galvano
meter . please explain briefly..?

Answer / er dhananjay kumar

Actually in dc genertae constant flux. When we puch on buttons the contant have to travel from one side of ct (p1) to another side of ct (p2) and in this traveling. The flux is cut by ct winding all this event exist for micro second and this will induce a little potential across secondary side and in unidirectional that's why meter sow a little deflection

Answer / raghavendran.r

I think for Polarity testing AC is being used in power transformers.Let me explain the circuit for the same .Keep the secondary side open.But short one of the terminals of the secondary side with the primary side, so that the primary current flows through the secondary.Now adjust the primary voltage using variac and note down the secondary voltage.If primary voltage is greater than secondary then the polarities are different.
If secondary voltage is more than primary then the polarities are same.
This is how polarity is tested in power transformers and Motors.
The same may apply to CT also.

Answer / gopi

IN AC LOSSES HIGH. BUT DC LOSSES IS LOW

Define CT & its function

6 Answers   Essar,

can indirect loading be called as phantom loading?

0 Answers  

Why consider motor rpm to select capacitor for motor

1 Answers   KSEB,

pls tell what are doing the three phase motor star and delta connetion with circuit diagram and control wiring .

0 Answers   Mukand,

how 650 volts creates? where is use?

0 Answers   DCL,

can we make a loop between neutral and body for grounding?

2 Answers  

On 400 amp factory load how kvarh capacitors provide

0 Answers  

How much weight an electrical engine can pull??

0 Answers   Maruti Suzuki,

sometime battery charged and then automatically charged when rectifier ON conition, is there any chances please clarify the same.

1 Answers  

what is meant by differential protection of transformer

1 Answers  

When PRV operated at power transformer ,can anybody tell me particular pressure for 50mva transformer plzzz.

1 Answers   BWSSB,

i ha done my 10th with 71% ,ITI with 81% 11th with 75% 12th 43% apprentiship with 71% in SAT i secure 1390 ,TOEFL 27 i was refused four times and in all me interview visa officar told that i am not Qualify for study in USA but i completed my 12th yes i got low persentage in my 12th but i seen to much student they already got visa with them 3 or 4 backlocs so why they are refused me ?

0 Answers