What determines touch potential

Lokesh M

 Profile Answers by Lokesh M Questions by Lokesh M

• Jan 3rd, 2013

You create a low-impedance path by bonding the metal parts of the electrical system and the grounded (neutral) conductor. You can achieve a touch potential of < 50v by reducing the resistance between...

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Why 440 volt 3 -phase power supply is showing neutral as phase and phase as no supply? As still the power is supplied to the load and its working?

rajkiran

• Apr 9th, 2014

In unbalanced loads, i.e., one phase has more load compared to rest of two phases. at that time the loaded phase voltage is low compared to rest of two phases. the difference in voltage is shown at neutral.

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If rotor speed will more than synchronous speed , slip will negative. and induction motor will now working as a induction generator. But how this negative slip can be maintain during its generation from IG and suggest me in details regarding operation of Induction Generator.

cmallick1201

 Profile Answers by cmallick1201 Questions by cmallick1201

• Jan 8th, 2013

Any shaft of the rotor is connect with a prime mover which is able to move the rotor greater than its synchronous speed, then negative slip can be maintained.

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manohar

• Mar 29th, 2013

The maximum voltage applied on transformer so that it can withstand without any damage (insulation, winding breakage etc.)

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if i generate 1 volt a.c. and with a 1:240 transformer , i step up it to 240 volts then can i lit a 100 watts (240 volts , rated) bulb at its full intensity, from the output terminals?
if not then why?. What are the parameters limiting this to happen? the windings,?wires?,source? or what? plz help

i don't have a new transformer, but tried this with a rusting transformer (10:400),...

boe

• Aug 8th, 2013

You should have stepped it up to a higher voltage level then finally stepped it down to this desired voltage level, because stepping up to the actual voltage you need may give u a lower voltage level due to losses in the transformer, and losses in the wires you used in connecting

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What is neutral transformer?

Alok Behera

• Feb 12th, 2014

If the earthing transformer on the Delta Side is outsides the Zone of protection the Earth Fault(E/F)in the delta system outside Current Transformer(CT) locations would produce current distributions a...

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If we take the winding displacement as 180 degrees in 2 phase winding what will happen?

Himang

• Jun 9th, 2014

Non uniform torque will be produced which would make the operation noisy.

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Hello sir/madam,
I have completed BE in electrical with 65% aggregate.Even after trying for many jobs I didnt get desired job so currently am working in BPO sector. so suggest me to get good job related to my educational background please....

sudhir

• Jul 29th, 2014

Learn Electrical Design.

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liyakath shaik

 Profile Answers by liyakath shaik Questions by liyakath shaik

• Jul 24th, 2014

the ?frequency ?is ?depends ?on ?speed ? synchronous ?speed= 120f/p ?from this ?we ?know ?that f= Np/120 in ?india ?speed ?of alternator is ?nearly ?about ?3000 ?rpm ?and ?the ?p...

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In meters with electromechanical " rotating disk " What is the difference between the meter of reactive powerVARHM and the meter of active power WHM.??
Working theory and internal structure.??
Thanks

sanat kumar patro

• Nov 5th, 2014

Active power is that power which is converted to other form of energy like heat,mechanical etc.But reactive power is that power which doesn't take place in energy conversion but is used in magnetization of winding for producing magnetic fields.

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Describe how high currents and voltages are measured with the help of instrument transformer?

Trushar Upadhyay

• Nov 15th, 2014

Current measured by ct and Voltage measured by pt

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hi every one
noticed when we prepair to the 20 km under ground cable operation that the kwh meter record covsumption on no load state and zero on kvarh meter ???
why????

A Rudrendra

• Jul 15th, 2016

We know that for every cable there will have a small amount of resistance. So, When we draw the equivalent circuit for this case it will be purely resistance connected across supply (as there is no lo...

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What is the suitable cable for fire alarm system

Techguru

• Nov 15th, 2014

Three types of power-limited fire alarm cables are currently in use. These are: FPL, FPLR and FPLP. Type FPL power-limited fire alarm cable is listed by the NEC as being suitable for general purpose fire alarm use.

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anand bhavsar

• Nov 27th, 2014

Body earthing is use to ground the potential that gets on body of equipment if theres shot circuit or any fault in quipment (motor winding getting shot with motor body), in order to protect humans fr...

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Is it a wise choice to use a brushless and commutor less dc generator as an alternate for inverter. Is it feasible to do so? From the knowledge I have when the rotor of DC GEN is rotated by external shaft, induced EMF is alternating current.?

Dhaval Parmar

• Dec 16th, 2016

Yes we can do it using controlling circuit it is called regeneration process first of all we create the rectifier circuit of o/p 48 volts 5 amp dc. this supply is given to the inverter bridge circuit ...

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How will you differentiate the transformer is LT or HT transformer whether belongs to Voltage range or MVA ratings. Explain?

B Vinod kumar

• Jan 21st, 2017

Depending upon the rating of transformer we can say, is that transformer belongs to LT or HT and we have to talk about transformer in VA only not in voltage of watts because, it is load less ie., There will be no power factor.

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What is static synchronization? when we use it?

JimmyBigballs

• Dec 22nd, 2014

Taking off a Woolley jumper to quickly!

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Why three phase motors are designed for 415 Volt AC in place of 440 Volt AC

yaswanth kumar

• Jan 28th, 2015

If motor is designed to operate exactly at 440v during low voltages(i.e,below rated voltage)the motor will draw high currents which damages the winding.so,the motors are designed to 415v (nearer to rated voltage).motors are usually designed to withstand increase or decrease of rated voltage to 5%.

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Rakesh

• Jan 28th, 2015

There is no difference between the two. Perhaps the word potential was adopted as the capacity (force) to do work. The word voltage is perhaps in memory of great scientist "Volts. There is third word also. It is called EMF (Electro Motive Force). It is also same.

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Why induction motor rotat anticlockwise ? how induction motor rota anticlockwise?in detail?

yogesh saini

• May 1st, 2015

In the induction motor rotor always rotates in the direction of rotating magnetic field .if field direction is anticlockwise then rotor also rotates in same direction to oppose the cause of cutting ma...

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