Difference between pi and pid controller

shreya

• Mar 28th, 2015

Pi is nothing but the proportional integrator controller.it is used improve steady state stability i.e used to reduced steady state error.and pid means proportional integrator and derivative controlle...

Rakesh

• Mar 23rd, 2015

Power system is technology to transporting the energy to industry and home .And the power system basically work on three principle Generation,Transmission,and distribution.

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We know synchronous machine run at a constant speed.Consider Synchronous motors, If you load the machine, will the speed reduce? If it does so, then it prohibits the property of synchronism. So Explain What is happening?

maverick

• Mar 28th, 2015

In synchronous machine speed always remains constant even when load on it changes. For increased load motor develops increased torque because of rotor falling out of phase by large angle delta; which...

bittu123

 Profile Answers by bittu123 Questions by bittu123

• Nov 10th, 2011

Even if you increase the load on synchronous motor upto specified limit, SPEED will NEVER fall down(unlike dc or induction motor), while maintains synchronous speed. BUT why??? It takes more current ...

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what is harmonic and how it is generated? Is it useful to us?

surendar

• Apr 1st, 2015

Harmonics are nothing but multiples of fundamental frequency components. they are not useful because the overall output deceases due to harmonics.

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abbasanwarali  

 Profile Answers by abbasanwarali Questions by abbasanwarali

• Member Since Oct-2008 | Oct 16th, 2008

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Actually there is no volt during normal condition. In case of any fault resistor will act as a low resistance path. because above mentioned components are high impedence components. so the huge fault (volt) will be grounded and the equipment remains safe.

HARESHKUMAR KHATRI

• Apr 4th, 2015

Absolutely there is no any voltage.

Rahulshelke

 Profile Answers by Rahulshelke Questions by Rahulshelke

• Jul 12th, 2010

The voltage is null or Zero.

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What is the diffrence between Altrnator & Generator? Outline its working principal.

satyaprakash sahu

• Apr 12th, 2015

As the main difference between alternator and generator is that field winding(poles) in a generator are present in stator i.e is fixed and armature winding is rotating whereas in a alternator the pole...

nimmala rakesh

• Mar 28th, 2012

Alternators and generators are the two devices which generates electricity.. the function of these are same but the construction of it is different. in alternators the armature is stationary and the m...

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abhishek

• Apr 12th, 2015

Neutral is the return path of the conductor through which current flows back to the system, however earth is used for protection against high fault currents. when the current is very high it flows through earth and bypass the equipment thus protecting it.

hari

• Mar 27th, 2015

We know about that the neutral and ground is almost same means but in this most difference is neutral may be earth but we didn't say that earth is neutral. neutral some current have as 0.0000001Amp bu...

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An overexcited alternator gives current at which power factor?Why?

Tuleswar Patel

• Apr 15th, 2015

As it is driving current i.e graeater than the rated value the pf will be leading .

satyam

• Mar 21st, 2015

It will operate in leading power factor, it is also called synchronous condenser.

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Asif Iqbal

• Apr 16th, 2015

Earth?

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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 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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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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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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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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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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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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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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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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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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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 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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