Why do not we use salient pole alternators in thermal power stations?

umeshprabhu

• Mar 11th, 2013

The Salient pole alternator because of its large diameter and short axial length takes more time to complete one revolution for a pair of poles under a coil, so the frequency of induced emf which is p...

cmallick1201

 Profile Answers by cmallick1201 Questions by cmallick1201

• Jan 8th, 2013

Salient pole rotor has larger diameter than cylindrical rotor. In thermal power plant rotor should rotate in high speed so that salient pole will unstable due to larger diameter so that we cant use salient pole in thermal power plant.

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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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What is the difference between Earthing and Grounding?

soni ranjan mahapatra

• Apr 10th, 2013

actually there are no such difference between earthing and grounding. Earthing word we use with our installation equipments in domestic as well as in substation,grid etc. And if due to some fault occu...

Dayo

• Mar 26th, 2013

Like bttu said, there is no difference between them and you can also add bonding to the group. earthing is basically used in britain and few commonwealth countries while grounding is used in america.

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SONI RANJAN MAHAPATRA

• Apr 23rd, 2013

As we know the main function of transformer is to transfer power from one ckt to another ..so ratio will same on both side of transformer..it only change the ratio of voltage and current .

praveen kumar

• Mar 8th, 2013

Power is same, so the ratio is 1:1

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pratap

• May 11th, 2013

As the transformer rating depends on cooling system and better cooling system gives higher rating of transformer. Heat caused by the losses occurred in the transformer and losses depends on both volt...

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nishchay shakti

• May 14th, 2013

In transformer emf is induced in primary or secondary due to self inductance & mutual inductance.flux is due to the self inductance is known as leakage flux,because it doesn't participate in transfer the energy from primary winding to secondary winding .

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Why capacitors are used in 1 phase induction motors?

SONY RANJAN MAHAPATRA

• Jun 25th, 2013

Basically function of capacitor is to improve the power factor and make the single phase motor self start having made split phase between both the winding(starting & running winding)

shaik sharif

• Jun 5th, 2013

In generally capacitors are playing main role in electrical system.And also power factor improvement done by capacitors so therefore capacitors mainly using for increase the starting torque of the motor.

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What is Earthing Resistance?

farhan

• Jun 27th, 2013

Question:- what is earth risistance.explain the earth risistance with the diagram

sushree16

 Profile Answers by sushree16 Questions by sushree16

• Feb 1st, 2009

It is used to reduce the damage on an earth fault. It capture the fault current when fault occur so that the extra current will not flow in the equipment in this way equipment is protected.

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Why isolation tranformer used in mcc panel?

Niaz

• Jul 14th, 2013

Isolation transformer at MCC are usually Y-Delta connected, so a fault on low voltage Y side would not travel towards high voltage delta circuit, so providing isolation to HV side

Raman Jain

 Profile Answers by Raman Jain Questions by Raman Jain

• Dec 3rd, 2012

To reduce the fault level.

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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 the difference between earthing and grounding
When should I use any of both? Thanks

boe

• Aug 8th, 2013

Ground and earth is basically the same thing. Its all about providing the least path of resistance to the earth mass. Neutral is connecting the star point of three phase equipment out which serves as a return path for the flow of electricity.

jayashree priyadarsini

• Aug 4th, 2013

1.grounding means connecting the live parts of the equipment to the earth where as earthing means connecting the dead parts of the equipment to the earth. 2.grounding provides return path for the f...

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ULAGANATHAN

• Oct 3rd, 2013

Voltage exist only for a closed circuit whereas emf exist for a open circuit.

vehvariya

• Sep 23rd, 2013

Voltage is the potential difference applied between the two terminals, where as EMF is the electromotive force induced in the conductor due to the voltage because of the floe of the current.

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Shivam Jha

• Oct 16th, 2013

Regulator is a device used to vary the supply voltage according to our use.Where as stabilizer is a static device which is used to maintain constant supply voltage

abhisek kundu

• Sep 18th, 2013

Regualtor is for d.c application & stabilizer is for a.c application

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tanweer salim

• Nov 21st, 2013

Ups uninterruptible power supply

nazmul haque

• Jul 16th, 2011

Uninterrupted Power Supply...............

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More or less what are the similarities and differences in paramagnetism and "Magnetic susceptibility".

prove :

average power = instantaneous power

in 3 phase induction motor

ripplenwinder

 Profile Answers by ripplenwinder Questions by ripplenwinder

• Dec 11th, 2013

We can define the 3-phase voltages as: 1) v1 = Vp x sin(u); 2) v2 = Vp x sin(u +120); 3) v3 = Vp x sin(u -120) 4) vn^2 = v1^2 + v2^2 +v3^2 = K 5) sin(u +/- v) = sin(u)cos(v) +/- cos(u)sin(v); 6) sin^...

ripplenwinder

 Profile Answers by ripplenwinder Questions by ripplenwinder

• Dec 11th, 2013

Good guestion Ill get back to you on that one.

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• Dec 11th, 2013

Polarization is a complex subject? But is easiest understood to me a position, location, direction, depth and etc. from a center point of refrence it is easiest understood by ceating a sphere around t...

Yasser Ali

 Profile Answers by Yasser Ali Questions by Yasser Ali

• Nov 1st, 2013

Polarity may refer to: In science: Polarity (mutual inductance) Polarity (physics), a physical alignment of atoms Cell polarity, differences in the shape, structure, and function of cells Chemical po...

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In the car alternator is a 3 phase generator and rectified instead of using dc generator.

Why ac alternator is better than dc generator in any car?

ripplenwinder

 Profile Answers by ripplenwinder Questions by ripplenwinder

• Dec 11th, 2013

No! 3 phase has no rectifier or voltage regulator a car alternator does. DC the voltage and current are suppose to be 180 degrees out of phase from one another or so most people think. Current can go ...

suryatejreddy

 Profile Answers by suryatejreddy Questions by suryatejreddy

• Apr 12th, 2013

DC generator although produces a.c,it must be converted to d.c by rectifiers in order to store in the batteries and to it supply must be dc,so in cars instead dc generators alternators are used.

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What is the difference between a capacitor and a condensor?

ripplenwinder

 Profile Answers by ripplenwinder Questions by ripplenwinder

• Dec 11th, 2013

There is no difference with the exception or semantics and argument. Tesla use to call a capacitor a condenser we now call a condenser a capacitor. Schematics symbol for both are the same!

Pruthvi

• Oct 21st, 2013

Main diff. b/w Condensers and capacitors are
i. Condensers are rotating while capacitors are static
ii.Smooth flow in KVAR can be obtained through condensers while it cannot be obtained through switching capacitor banks.

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Hello, I have two 12v DC wind generators that can provide charge to a 72v battery bank. This bank is used to power a 72Volt Electric Motor. I have one connected to the first battery (the positive connect for the entire bank) and the other generator is hooked up to the other or last battery of the 72v bank (the negative connect). Is this proper? Or, what do you recommend? Which manner should I best...