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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When a conductor placed in a rotating magnetic field, what is the action inside the conductor (basis of electrons /charge) ?

R.Shrikant

• Sep 22nd, 2011

When any conductor comes under rotating magnetic field , principle of induction satisfies which energies the electron of conductor and start flowing through it by process of conduction.

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If you make a capacitor out of aluminum plates,
and electrically glue carbon or resistive plates to the aluminum ones, and use a dielectric between the sets of plates.

where the input is on the aluminum plates
where the output is on the resistive plates.

Would it charge quickly thru the aluminum plates and discharge slowly thru the resistive plates.
Making...

SGhosh

• May 15th, 2012

The capacitor would definite charge faster when a voltage source is connected to the Aluminum plates. The semi conducting layer will provide smoothness in the equipotential lines and reduce the voltag...

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1)How much current can a 3-1/2 core 100 mm wire carry?
2)What is the latest generation of circuit breakers called?
3)What are the special cables required for explosion proof wiring?
4)What are the different types of soft starters for large motors?
5)What is the similarity and what is the difference between relays and PLC?

bittu123

 Profile Answers by bittu123 Questions by bittu123

• Nov 8th, 2011

I am answering few of them................. 1)How much current can a 3-1/2 core 100 mm wire carry? - It depends on "what conductor(aluminium, copper or else) you are using" and "whether it is insula...

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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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Synchronous motor rotates with constant speed but induction motor is not like that, Why?
What is the construction difference between Synchronous motor and Induction Motor?

pveee

 Profile Answers by pveee Questions by pveee

• Dec 26th, 2011

Synchronous motor are constant speed motors where IM are variable speed motors.
Synchronous motor requires special starting set up where as IM are self stared.

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How choke coil and starter gives high voltage(1200v) across tube light to ionise gases in starting while after starting it limits voltage?

tharunp

• Jan 17th, 2012

After supplying 220v, the inductor will be charged. After certain time constant that inductor becomes open circuited. when inductor while charging, suddenly becomes open circuited means it develops hi...

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there is a Series of turbines made by Siemens, one of them are SST - 150, in which SST stands for siemens steam turbine, what is 150 stands for?

preet

• Oct 4th, 2012

150 is the frame size

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Phaneee

• Jan 3rd, 2012

Yes, bcoz this meggar has a preliminating voltage statures. so,we can easily check the polarities.

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Why zero sequence component not found in two phase motors?

Harish P. Girhe

 Profile Answers by Harish P. Girhe Questions by Harish P. Girhe

• Apr 3rd, 2012

In two phase induction motors one phase & neutral is applied. For successive working of motor one phase is spitted into two equal and opposite component. These two component are having an opposite action on each other.So two phase motor works successively.

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We have a 3 phase induction motor, having stator length greater than rotor length by 10mm. my question is that, is this will affect the operation of motor (means cause an abnormal condition like temp. rise etc.)?

SGhosh

• May 15th, 2012

In my opinion, only in case the rotor is not centered axially with the stator will lead to vibrations. The difference in the lengths of the rotor & stator will lead to more leakage flux leading to poo...

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I have installed 3 Phase Compressor(Condensing Unit) and 1 Phase Evaporator(Fan).

In this 3 Phase Compressor requires Three Phase Supply and not Neutral (which is connected to DOL starter connected) and i want to take power supply for Fan which has phase and Neutral. Whether can i loop phase from the motor and Neutral from the Control Panel. Please tell me its correct or not.

myid123dvg

• Feb 27th, 2012

Yes you can. Make sure your single phase load doesn't get any ground fault. If it happens, control supply trips, tripping the three phase load too.

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It is compulsory an magnetic field to produce an current?

SHASHI

• Mar 24th, 2012

NO, ONLY WHEN THE MAGNETIC FLUX LINKED WITH A SURFACE CHANGES CURRENT IS PRODUCED,i.e when the body or magnetic lines are moving.

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How much output will reduce , if 25 mw, 13.8 kv, 1800 rpm alternator runs in 1500 rpm 50 hz? What are the disadvantages if continuously run in 1500 rpm?

SGhosh

• May 15th, 2012

Voltage will reduce by a factor 1500/1800. Reduction in output of the generator does not solely depend on rpm. The various other factors associated with the operation of the prime mover and load will govern the output.

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Hi there.

Is there an international standard that specifies the size of the grounding conductor to bond a metallic part of the installation to a grounding bar?. And to connect the grounding bar to the grounding rod?. Thanks.
Miguel

anees mustafa

• Nov 24th, 2012

If your cable is 300mm, grounding conductor size is one core of cable, which cable is used to connected the equipment.

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What will happen if voltage applied to a load is less then the rating specified ?

ahmed

• May 7th, 2012

The load will not work right as its performance design

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SGhosh

• May 15th, 2012

Cable glands serve the following purposes:

1. Fixing the cable mechanically to the panel.
2. Making proper electrical bonding of the panel with the armour of the cable (grounding).
4. Ingress protection to the panel after cable termination.

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What size of grounding conductor should be used to ground an XLPE metallic screen?
Is there an international standard that supports it?

Thanks

SGhosh

• May 15th, 2012

The Indian & International standards for grounding are IS 3043 & IEEE 80 respectively. The size of the ground conductor for grounding the screen of an XLPE cable depends on the calculated ground fault...

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Why distribution system has high r/x ratio

ALBIN THADEUS

• Oct 23rd, 2012

X/R ration means (line reactance/line resistance) for short transmission lines it is X/R3.0 because long lines length of transmission line is due to this inductance is more(L directly proportional to...

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What role you play in your project in b.tech electrical engineering ?

shaik sulthan

• Oct 18th, 2012

Team memeber

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