What is the effect of hysteresis loss in transformer/machines especially in DC one?

shad

• Aug 21st, 2015

But in PS Bimra book they said in transformer the hysteresis loss is inversely proportional to frequency..

bittu123

 Profile Answers by bittu123 Questions by bittu123

• Nov 7th, 2011

@ above, You are right in the sense that "Hysteresis loss depends on frequency". But there is some misconception, like 1. DC machine is having zero frequency (misconception???????, Relax..., I am n...

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How we can say that losses are frequency dependent? If there is no frequency than there is no losses? any have physical significant of this statement? Please provide me a better solution for my doubt

M.SANTHOSH KUMAR

• Aug 7th, 2015

Why we do not give DC supply in transformer means DC current is a direct current, so alternating flux is not produced, because input supply and flux will be same, so emf will not produced and same tim...

avdhesh sharma

• Aug 2nd, 2015

Current=voltage/impedance, When DC is applied then Z=R =>I= V/R and R is low for transformer, so I increases very high, so heating as current is not allowed to flow further and hence intuitively you c...

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How can I prepare for Ies from 2nd year onwards?

shailesh

• Aug 1st, 2015

By applying for IES Exam online

chandramvs

 Profile Answers by chandramvs Questions by chandramvs

• May 29th, 2015

First of all your core subjects begin from 2nd year only.so be strong with your B.E/B.Tech subject. If you have good faculty then go on par with them and study the complete subject within the same se...

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Why the transformer neutral point connected to earth?

GARGI VERMA

• Jul 30th, 2015

In Simple words, There are two type of losses in a transformer; 1. Copper Losses 2. Iron Losses or Core Losses or Insulation Losses Copper losses ( I2R)depends on Current which passing through tran...

Ayaz Shaik

• Jun 30th, 2015

It does not mean always the t/f neutral is connected to ground..only in case of power t/f it happens mainly for two reasons 1) We know all things like harmonics, fault occurrence, lightning, over cur...

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Why converter transformers are rated as 690V on secondary side and What is the specific reason for using 690Volts in converter transformers?

We prefer star delta starter for reducing start voltage but Normally in D.O.L starter-motor is always connected in star - it will also start in reduced voltage.... Explain

saeed iqbal

• Jul 24th, 2015

In starting motor gets 3 to 4 times more current then its normal current. So we use star delta starter to limit the starting current of the motor with the help of star circuit.when motor will run in t...

Ahmed Elsisy

 Profile Answers by Ahmed Elsisy Questions by Ahmed Elsisy

• Jul 22nd, 2015

In large motors: when motor start it draws a large current in starting , so we use star delta method to reduce this current in starting by Firstly we connect motor on Start (motor no loaded) on low v...

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Why can't the photo diodes produce large amperes of current? are there any large photo diodes producing current more than milli amps??

sameh

• Jun 28th, 2015

This is depend on the type and amount of the material that used in the diode to the materials used cant produce high current

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Saurabh singh

• Jun 12th, 2015

When two coil are placed close proximity to each other & an " alternating"current is flowing in one coil that cause voltage induced in other coil. This phenomenon is known as mutual inductance.

ahmed siddiqui

• Apr 26th, 2015

The two coils contributes in both coils current .

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Co-operative switching means that a task that is currently running will voluntarily give up the processor at some time allowing other processes to run. State True or False.

TRUE

FALSE

sountharyaraja

• Jun 9th, 2015

True

narsimha Vuggepalli

• May 29th, 2015

True

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I am last year Electrical Engineering student.I am interested in Electrical Machines and Power System . What can I do with these subjects as a final year project?

M.V.S.S.CHANDRA

• May 29th, 2015

You can do good number of projects on power systems but limited projects will be available in the area of machines.however if u are very much particular you can find good projects but not many without...

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In which of the following type of scheduling, the processes may take very long time to complete, thus holding up other waiting processes in the queue?

Co-operative scheduling

Round Robin scheduling

FIFO scheduling

Priority scheduling

Dan

• Jun 1st, 2015

FIFO (First In First Out) scheduling

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Identify the operating system strategies on which modern operating systems are built?

Batch
Timesharing
Dedicated
All of the mentioned options

venky

• May 20th, 2015

Batch

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What is the operating range of voltage and current in grid supply in india?

priyank333

 Profile Answers by priyank333 Questions by priyank333

• May 10th, 2015

It depends of which ever load would applied & based on that it could supplied through source with that voltage & current with regulation.

TAPAS MOHANTY

• May 5th, 2015

The voltage can deviate in between +6 to -6 from its rated value.

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Why induction motor rotat anticlockwise ? how induction motor rota anticlockwise?in detail?

yogesh saini

• May 1st, 2015

In the induction motor rotor always rotates in the direction of rotating magnetic field .if field direction is anticlockwise then rotor also rotates in same direction to oppose the cause of cutting ma...

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Why neutral point is not required in high transmission line?

Karuppiah arumugam

• Apr 27th, 2015

Power system ?having Generation,transmission and distribution . Distribution transformer only need neutral ?becoz we need lighting load supply. 230V ?(phase to neutral 230v) in the transmission system only we sending voltage from one end to another end?

SURAJTHEGREAT

 Profile Answers by SURAJTHEGREAT Questions by SURAJTHEGREAT

• May 5th, 2012

HVDC Transmission lines are carriers of power,they are not source of generation.if there is any fault in HVDC,the extra current has to flow through generator,transformers...since alternators and trans...

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Does the stator of the Induction machine consume only reactive power? If this is the case, so where does the active power in the rotor come from? Explain.

Nagaraju

• Apr 28th, 2015

What are the effects of motor when reactive power will be low

rajsekhar240

 Profile Answers by rajsekhar240 Questions by rajsekhar240

• Dec 2nd, 2009

The stator does not consumes any active power as it is (except we neglect the stator copper losses) it takes the active power and transfers it to the rotor through magnetic field transformation(means ...

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Why voltage is to be controlled?
why current is to be controlled ?

Asif Iqbal

• Apr 16th, 2015

Earth?

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