Night time load on our system street lights, one DG battery charger-24v, 6 KVA UPS. On UPS only 12v solar fencing battery. You are suffering from leading pf. Can you say how to improve pf?

ashish dubey

• Dec 18th, 2016

We can improve the pf by reducing the harmonics.

vivek

• Sep 30th, 2016

By shutting down the capacitor bank.

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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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deepak kapoor

• Dec 9th, 2016

True formula is Ns =120F/P

Sushil

• Oct 31st, 2016

Frequency is constant in a grid is because 1) All Equipment are designed for 50hz. Frequency 2) We genrate 50hz. 230 volts so in India all generation plant are 50hz. 3) All grid are inter-conected s...

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What should be earthing between Earth to Earth in industries ?
How we get no of earth pit in company.?

Devang

• Dec 8th, 2016

Earthing system depends upon the soil resistivity, to calculate the no. of earth pit. one should know the soil resistivity. only after that you may calculate no. of pits, treated or un treated earth p...

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What is the use of stator and choke in tubelight?

G.Harish

• Nov 19th, 2016

It gives initial current to bulb

rohansharma

 Profile Answers by rohansharma Questions by rohansharma

• Mar 26th, 2011

Choke Coil : for producing a very high voltage across the terminals of Tube Light.Starter : It applies that high voltage suddenly to the tube light filaments, which makes ionisation of the gases in the light.

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Is a synchronous generator running a constant load has a longer lifetime than a generator running a variable load? If yes why?

Chandan dubey

• Nov 11th, 2016

It can be run but in practical there is necessary to change it. So if change in load in other gen. Will result change in current and load angle (angle between Sand v) and also change in active power, for which it will be need to arrange frequency regulating equipment, so overall cost will increase.

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How much of power can I generate before connecting it to step up transformer presently?

Chand

• Nov 3rd, 2016

We can generate 11 kv

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gagan.bhatia

 Profile Answers by gagan.bhatia Questions by gagan.bhatia

• Oct 25th, 2016

In electrical engineering, a synchronous condenser (sometimes called a synchronous capacitor or synchronous compensator) is a device identical to a synchronous motor, whose shaft is not connected to anything but spins freely.

romeo vincent

• Oct 18th, 2016

What is the advantage of capacitor used in ballast for discharge lamp?

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Srinath

• Oct 6th, 2016

Can you elaborate the reason why we have cos angle for active power and sine angle for reactive power?

ABC

• Sep 4th, 2011

Bcz in impedence triangle(cos=b/h) R(resistance) is in the base and imepedence is hypotaneous.
power factor(cos )=R/Z. THATS WY WE are using cos in the power factor notation.

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What is the physically meaning of form factor?

amit gupta

• Sep 29th, 2016

Form Factor = R.M.S. Value / Average Value = 1.11

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What happens to extra power, if at an instant generated power is 10000 MW but demand is 8000 MW?

G. Gray

• Sep 28th, 2016

The so called "extra" power is dissipated throughout the systems often in loses such as heat etc.

prayag c nambiar

• Sep 26th, 2016

The extra power generated gets distributed through the grid it is connected.

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adnan

• Sep 27th, 2016

The emf induced at power plants is sinusoidal AC, so it is not because of our choice. It is the natural simplest AC waveform that we obtain.

Neha bisen

• Sep 24th, 2016

Sine wave forms we can indicate the maximum and minimum amplitude and its variation with respect to time.

RMS value of sine wave is more than the other wave like square, triangular etc.

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What is the role of air gap in any electrical machine how does it affects induce emf??

A.Rajasekharreddy

• Sep 13th, 2016

Air gap is used to produce magnetic flux between stator and rotor. Air gap is more uniform for the production of sinusoidal EMF in alternators to eliminate the harmonics. Air gap is more in syn machin...

NITIN

• Aug 10th, 2016

Airgap is used to produce magnetic field between stator and rotor. Flux is produce in rotor winding, then torque develop and rotor is rotating, but if air gap is more between stator and rotor then more magnetizing current is required and also loss is more.

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A.Rajasekharreddy

• Sep 13th, 2016

Brush less alternator is nothing but stationary armature, Brush alternator is a rotating armature.

Shan

• Aug 24th, 2016

Is there a exciting stator in brushed generator? If not what is the reason?

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What is meant by strung bus and where is going to be used and what is purpose of it?

arun

• Aug 29th, 2016

Bus bar is used only in MV panel and SSB

Dhanashri

• Aug 1st, 2016

The strain bus-bar is a flexible, stranded conductor which is strung between substation metal structures and held by suspension-type insulators

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What are the roles, responsibilities and work of an electrical engineer in a cement plant?

Asfandyar Ali

• Aug 10th, 2016

Troubleshooting of Electrical Fault, Maintenance of electrical Equipments, Inspection of Electric Motors.

gokul pawar

• Jan 19th, 2016

Role is in the same inspector for the finding out the more consumption area and improve it because in cement industry there is max. use of electricity

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Is there any case that we could face or find Voltage without Current and Current without Voltage?

N K WATTAS

• Aug 10th, 2016

1) Voltage without current:This situations can also happen when current is leading by 90 degree as compared to voltage.
2) Current without voltage: this situation can happen when current is laging voltage by 90 degree.

Mandeep kumar sinha

• Aug 10th, 2016

I know voltage without current when there is open circuit and current without voltage in the case of short circuit

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Can mechanical energy be directly converted into electrical energy? Explain

Edwin Rodrigues

• Aug 3rd, 2016

Mechanical energy can be converted directly into electrical energy. Examples such as static electricity due to different material. Lightening.

Vinod

• Jun 11th, 2016

No, because withoit using magnetic domine its not possible to convert mechanical energy to electrical energy or electrical energy to mechanical energy, keep remember that without Magnetic fields these energy conversations are impossible till now...

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Dear All,
I have a done a house hold wiring for villa, During a megger test we notice that valve between phase and neutral is good 500 Mohm when test between Phase to earth wire it is shown as less than 100 Mohm when I remove the all wire from conduit and we test it is showing correctly as 500Mohm, After that i replaced all wire as New before pulling the wire in conduit i checked it is shown...

Edwin Rodrigues

• Aug 3rd, 2016

The conduit probably has moisture or humidity. Or the temperature of wires inside the conduit has increased. The insulation resistance depends on factors of humidity and temperature.

bhanu

• Jul 21st, 2016

Megger which is used to find the discoonection in the underground cables

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Which of the following options relate to a Multi User OS?
UNIX
Windows
Mac
All of the mentioned options

Turbo

• Jul 23rd, 2016

UNIX

srilaya

• Apr 9th, 2016

UNIX

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