What is dielectric strength?

Harish P. Girhe

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

• Jan 4th, 2011

Material can be conductive or non-conductive. It depends on its di-electric property of that material. Di-electric means property of an material to oppose flow of electrical current. For better condu...

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Calculate the length and the distance coved by the lightening arrestor to be installed above 20 feet height industrial building.

Krishna Kant Gupta

• Mar 13th, 2012

Lightning arrestors or lightning rods are used to arrest the lightning surges.This is based on Rolling sphere method according to the Type of protection class you are providing.Rolling sphere radius of 30M or 45M can be used.

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Why current coil and pressure coil of wattmeter is connected in different phases for reactive power meaurement?

bittu123

 Profile Answers by bittu123 Questions by bittu123

• Nov 8th, 2011

You have to draw a phasor diagram. then U will get it easily. Draw Vr, Vy, Vb with 120 degree displacement. Now draw Ir leading(lagging) Vr by some angle, Say 0. and Iy displaced 120 degree to Ir, sa...

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What is a Two Phase Induction Motor?

sandeep.psg

 Profile Answers by sandeep.psg Questions by sandeep.psg

• Mar 2nd, 2011

2 phase Induction motor(IM) has 2 sets(phase) of coil displaced electrically by 90degree. In practise we dont have dedicated 2 phase IM because of not supplying Constant Torque. But we do have so...

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A heater of 1500w, bulb of 100w & 40w are connected respectively as sequence as stated above across supply. What effect will be observed on illumination/power consumtion of all of them?Now sequence is changed as bulb of 40w then heater & last bulb of 100w. What effect will be seen on illumination/power consumption of all of them?

Jai Pradeep

 Profile Answers by Jai Pradeep Questions by Jai Pradeep

• Mar 13th, 2011

In the first method?the heater with 1500Watts connect, i.e large load is connected in first of a sequence so most power consumed by this. The 100 & 40 watts bulb will illuminated lighter.In the seco...

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What is a Quiescent Point (commonly called a Q-point)?

uttkarsh BIT

 Profile Answers by uttkarsh BIT Questions by uttkarsh BIT

• Mar 26th, 2011

Quiescent or Q-point of any device is the intersection point of its characteristic curve and a given load line(or load curve). It actually is the most suitable point around which the device works under maximum efficiency. 

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What is the difference between American and Indian distribution system? Which one is better and why?

bittu123

 Profile Answers by bittu123 Questions by bittu123

• Nov 8th, 2011

AMERICAN : frequency 60Hz House hold voltage: 120v and 240v Split phase 3 wire service INDIA: frequency 50 Hz House hold voltage : 230v and 4...

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SGhosh

• May 15th, 2012

The loop keeps on rotating in the same direction irrespective of the position of the conductors cutting the magnetic flux. Magnetic flux does not change its direction either. The only things which kee...

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Could you explain that how to select an induction motor for a specific mechanical load(inertia). is there any formula or calculation then please give me. i shell be very thankful to all of you.

mahmoudp1

 Profile Answers by mahmoudp1 Questions by mahmoudp1

• May 3rd, 2012

First know the load specifications like power needed or torque and from the catalogues choose the correct motor without any calculations.

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Briefly explain the difference between the software testing and embedded testing?

I need the brief explanation please provide the details as early as possible

Pramod Jagtap

• Feb 23rd, 2012

The Software testing is mainly done on the software program modules and contains bug identification and its correction. On the other hand Embedded testing can be a Hardware or Software testing. In Har...

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Why we use contactors in ckts....how many types of contactors are there.. how we select the contactor for in ckt for its operation

bittu123

 Profile Answers by bittu123 Questions by bittu123

• Nov 8th, 2011

Contactor is basically a large relay kind of thing which is used to switch large amount of power. It has multiple contacts and all contacts can be switched together. all multiple contacts are controll...

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What is the technical difference between earth fault and earth lekage relays ?

bittu123

 Profile Answers by bittu123 Questions by bittu123

• Nov 8th, 2011

Earth fault : If live wire gets touched to the earth, heavy current start flowing through this wrong path, causing short circuit and considered to be a kind of fault. Earth leakage relay: Instrument ...

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Abushama

 Profile Answers by Abushama Questions by Abushama

• May 29th, 2011

Since the induction motor and Generator have the same constructor then running a motor as a generator is possible . if we want to run ?induction motor as a generator two things should be done , First...

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Why ct earthing should be connected at one end only? if ,we connect more than one end means what will happen?

Raman Jain

 Profile Answers by Raman Jain Questions by Raman Jain

• Nov 25th, 2011

Circulating currents starts to flow.

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If we connect more than one end what will happen?

Prabhu

• Aug 8th, 2011

If ct is having double earthing means, the ct secondary current will circulate between the two earthing point, not circulate the circuit, due to that always ct secondary is having single earthing only.

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What is the necessity of harmonics in electrical field?

Friend #1

• Aug 9th, 2011

I'm assuming you're talking about electromagnetic fields here. The harmonics in an electrical field has to deal with eddy currents at different frequencies (especially high ones). This is more easily ...

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Normally we represent the three phases, RED, YELLOW, BLUE for identify the phase shift of the phases.
Why not other colors, any reason for that? Or “R Y B” colors are the basic colors.

Ibrahim Baklawa

 Profile Answers by Ibrahim Baklawa Questions by Ibrahim Baklawa

• Aug 15th, 2011

According to The United Kingdom Electrical Code

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Can anybody tell me that how to choose CT for a specific load? I have a 200kw induction motor, which ratio CT should be installed? Is there a formula or calculation that determines the CT ratio for a load?

Nishant Vadhavana

• Sep 5th, 2011

What is the voltage level of Motor--415 v or 11KV or 6.6 KV Based on that find its full load rating Check the application of CT - metering or protection as it defines its saturation limit Check what s...

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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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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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