Answer / pised

Assume that the transformer is typical iron-cored stepdown
transformer.
The actual output result will not be 20.86 volts calculated
with straight ratio and the transformer will likely be
destroyed due to the following factors:
1. Iron core has lower frequency response and that makes it
good only for 50-60Hz. 8,000Hz frequency will not get
transformed properly because the magnetic flux in iron core
will be saturated. The primary coil will receive
equivalent to direct current voltage therefore is likely to
overheat.
2. The insulation of a 230v transformer will not withstand
400v therefore ground leakage is very likely.
3. The size of copper wire and number of winding suitable
for the current rating designed for 230v will draw more
power into the coil when connected to 400v, again,
overheated.

Answer / anshul rawal

3/23volts or appro .13 volts. assume xmer to be ideal one
with no resistance in windings,nohysteresis loss etc, at
80khz the frequency is 160 times 50khz ,so current in
primary is 160 times less than at 50hz as inductive
reactance of primary ,ie 2 pi f l is 160 times more. as
current is 160 times less so is magneti flux in core,and so
is induced emf in secondary. if hysteresis loss and eddy
current loss r considered , then it is even less

Answer / raj(b.e.electrical)

e1/e2=e3/e4
230/12=400/e4
e4=400/19.16667
e4=20.869v
so ans is : 20.869v
freq remain same.

Answer / prashant

o/p voltage will be 20.8 volt, but due to very high
freguency 8 Khz hytresis loss & edd current will be
increased because this loss is directly related to
frequency.

Answer / shyamkr

20.869v,8kHz is the voltage and frequency of secondary.

Answer / satya

20.86v.8khz

if an alternator or turbine using fuel to produce ele energy and we didn't connect load to the ends then where was gone the ele energy

2 Answers  

Distinguish between shunt and series field coil constructions.

2 Answers   BEL,

hi i have applied for lic of india south cenrtal zonal ,hyd. i didnt get hall ticket till now.let me know how can i get form internet

0 Answers  

why transformer donot allow the dc?

17 Answers   ONGC,

Which motor has high Starting Torque and Staring current DC motor, Induction motor or Synchronous motor?

5 Answers   BSL, Elite, TTA,

what is V=4.44FBN, THIS 4.44 ONLY U GOT the voltage in term sof 11, 22 etc this 4.44 u will get from form factor which has a value of 1.11

1 Answers  

why all transformer colour is same?

3 Answers   OPTCL,

HOW TO CALCULATE THE LOSSES OF CURRENT FOR LT CABLE JOINTING TO MOTOR SUPPLY.

2 Answers  

What is the difference b/w earthing & grounding?

6 Answers  

Why rating of transmission line in kv not in kva

2 Answers  

Why are transmission lines multiples of 11? Is it because of some historic reason ? Or is there a scientific base to it?

5 Answers  

what happens when one of the phases out 0f 3 phases been removed under working condition and no load condition will the machine run if so plz send me why

2 Answers