Answer / chandrashekar g

form factor is the ratio of r.m.s value to average value of
any electrcial quantity
ff=r.m.s/ave. value
0.70vm/0.63vm=1.1 where vm=max.voltage

do u know the formula for finding emf of transformer

E=4*1.1*Øm*f*Np volts
where
1.1=form factor
Øm=Bmax*A
f=frequency
Np= no. of primary turns

so transmission depends on form factor

Answer / harikrishna

form factor is the ratio of r.m.s value to average value of
any electrcial quantity
ff=r.m.s/ave. value
0.707vm/0.636vm=1.11 where vm=max.voltage

do u know the formula for finding emf of transformer
E=4.44*f*Øm*Np volts
where
1.11=form factor
Øm=Bmax*A
f=frequency
Np= no. of primary turns

so transmission depends on form factor

for ac networks if the voltage wave form is V=Vm sinwt here the voltage Vm=230 for the frequency 50hz then the time period is 0.02 sec then for the time period 0.12 sec what is the voltage

4 Answers  

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what are the precuation should be taken ahen installing power transformer,circuit breaker,current & potential transformer

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IN A MAGNETIC MATERIAL HYSTERYSIS LOSS CAN'T BE REDUCED TO ZERO. HY?

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why generator and t/f ratings given in kva?

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1.what is electricity 2.what is electronice 3.how many modules 4.five electrical component with symbol 5.five electronice componene with symbol 6.how convert 220v.A/C to 24v/DC 7.220V.WAIRING DIAGRAM OF AMMETER/VOLTMETER/OHMMETEER

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I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?

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What are objectives of energy managements ?

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why not use capacitor in Dg sets.

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I do wonder why current is present in neutral wire?i check single phase lead current feeding air conditioner...on its phase its current was 10A while same was 10A in neutral...as we know in neutral voltage is zero so if voltage is zero then how current appears on amp meter? my second observation is (just imagination)when I touch phase wire it give me shock but when i touch neutral nothing happens although as above its carrying current(amps) third but with same logic...as in simple Alternate current sine curve there is + and there is negative peak.means every time phase changing so how come every time same phase and same neutral stand (pardon for english mistakes)

1 Answers  

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