What is the main difference between Transformer based UPS and Transformer less UPS and its operation?

Dheeraj Rai

• May 22nd, 2016

Transformer Based UPS Transformers in general are used for number application, the most obvious one is to stepping up or down the voltage. In UPS application they are also used: To create galvan...

Answer Question  Select Best Answer

How to measure the cross-sectional area of a cable which is 1000 sq. mm.?

Heaven

• May 24th, 2016

3.14 x radius of cable^2

KHURAM

• Dec 10th, 2015

A=pi*r^2

Answer Question  Select Best Answer

Neutral is connected to Earth at the source to ground, the unbalanced current in the electrical network mainly in distribution system, What happens if we connect neutral to earth at load side DB?

ashutosh singh

• May 24th, 2016

What is MD & MTTR?

ali raza

• May 21st, 2016

No because when unbalance current flow through neutral short circuit occurs at that point where neutral grounded

Answer Question  Select Best Answer

What are the technical reasons for Soaking Test in Transformer and Switch Gear?

ali raza

• May 26th, 2016

I think the transformers are soaked with normal operating voltage level as testing with HV of the transformer insulation, winding at site is impractical as well not economical. Besides soaking allows ...

Answer Question  Select Best Answer

Explain How to Start a Induction Motor?

Viral p. patel

• May 28th, 2016

When we give the supply to starter winding. The alternating flux will be produce. That flux link with rotor winding through core. Then the current will be produced in rotor winding. The rotor winding ...

Answer Question  Select Best Answer

What are the elements in electrical engineering?

Josue

• May 30th, 2016

Resistors, Capacitors and Inductors

Answer Question  Select Best Answer

chanchal

• Jun 5th, 2016

Earthing is inside of earth with any conductive material and grounding is on top of the earth for machines (grounding can be with high ohms but earthing must be with 0.1 ohms)

harsha vardhan

• May 2nd, 2016

In my case both are similar

Answer Question  Select Best Answer

How to calculate the NGR resistance to connect in alternator / transformer. I mean to say thumb rule of NGR against MW capacity of alternator / transformer.

Aadil

• Jul 1st, 2016

NGR or Neutral Grounding Resistors are used to limit the ground fault current to a safe value in the event of earth fault. A NGR limits the earth fault current to a value which will be sufficient to operate protective relays and prevent unwanted fault damage.

Answer Question  Select Best Answer

Why 660v is use in place of 440v in some big KW motor?

A Rudrendra

• Jul 14th, 2016

It is the secondary standard voltage level in LT side and by using this voltage we can reduce the motor rated current.

Answer Question  Select Best Answer

How much min BDV of oil in transformer is required when charged it first time in 11kv, 66kv and 132 kv of transformer?

A Rudrendra

• Jul 15th, 2016

It should be minimum 54KV

Answer Question  Select Best Answer

What is the thumb rule for insulation value in bus bars, phase to phase and phase to earth for 11 & 33 KV system?

A Rudrendra

• Jul 15th, 2016

As per my knowledge there is no thumb rule but the minimum clearance between phase to phase & Ph to Earth in 33KV is 1.5 & 1Meters

Answer Question  Select Best Answer

How to identify Transformer rating without Name Plate details?

A Rudrendra

• Jul 15th, 2016

By using type of bushings used we can know the following details 1.Whether it is step up of step down transformer 2.Voltage rating of primary and secondary side By using type of cooling we can fi...

Answer Question  Select Best Answer

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...

Answer Question  Select Best Answer

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

Answer Question  Select Best Answer

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

Answer Question  Select Best Answer

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...

Answer Question  Select Best Answer

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

Answer Question  Select Best Answer

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

Answer Question  Select Best Answer

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

Answer Question  Select Best Answer

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?

Answer Question  Select Best Answer