Answer Posted / sathesh
As we know that v=iz+e1,when dc supply is given the
tfr,there is no induced emf e1 in the tfr, so there is no
oppposition to the supply by the emf induced in the primary
winding, which makes v=iz+0, this makes v=iz => i=v/z,
if v=230v, let z=3ohm, then i=77Amps(app), which leads
more heat in the windings.. cause the burnin of the
transformer, when dc supply is given to tfr...
| Is This Answer Correct ? | 3 Yes | 0 No |
Post New Answer View All Answers
If breaker is undefined position, first step to do.
how can check the resistance of battery contact?
for a 500 KVA connected load, I calculated 30% of capactor for power correction. Even after using 225 KVR capactor PF is not improving. What could be reason for low Phase correction factor?
what is meant by moulded case circuit breaker ?
how much flux density of CRNO core
why we have to particulary use ACB for below ratings,even available of MCB,MCCB with that range ?
should %impedance be high or low in a power transformer? if so why?
what is the safe meggar values for motor, transformer HT, LT and Cables? IF we want to replace I/C bay at our 220 kv substation which is of 140 mw load capacity bay to be replaced by 400 mw capacity bay.other than CT(1200/1) what are the other equipment i have to replace. why we generally use 3.5 core cable or in other word 1/2 core for neutral and also confirm me that in balance conditiob(3 phase)current in neutral will zero
What is the minimum distance to be maintained in between HT panel and LT panel and Instrument panel as per IEC and NEC standards?
how diside ct mf exmp.200/5 ct
Why MCCB is Getting tripped sometimes when there is no load in the Midnight ?
what is the formula for efficiency of francis turbine and generator for hydropower? what is best way to select francis turbine and generator?
how to select electronic timer(Star-Delta) setting for diff. rating motors
Don't you have similar question banks related to Oral Certification Examination conducted by Mercantile Marine Departments / Directorate of Shipping, Ministry of Shipping for Electro Technical Officer?
The metal-enclosed switchgear and controlgear is subdivided into three types: 1. metal-clad switchgear and controlgear; 2. compartmented switchgear and controlgear 3. cubicle switchgear and controlgear. What is the main differnence between them. State some example.
