How does Slip Power Recovery System work? How to capture supply for recovery? Is it any possibility to design model of slip power recovery system drive?

Santosh

• Jan 10th, 2016

Of course, there are different methods to recover the power wasted in rotor and that is done by using Scherbius Drive or Kramers Drive where the rotor terminals are connected to a rectifier and again...

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you have three boxes, one has a resistor, second has a capacitor, and the third has an inductor. Find what is in each box, using a battery, a switch and a lamp. You can build any circuit you want, to figure out which box have a resistor, and which one has the inductor, etc. How can you solve that?

chandramvs

 Profile Answers by chandramvs Questions by chandramvs

• Jan 3rd, 2016

Connect the battery, switch, lamp and the box in series and observe what happens, 1) If the lamp glows with constant brightness then the box has resistor. 2) If the lamp initially is dark and finall...

abdelmonsef

• Jan 2nd, 2016

A battery is DC, so when connecting the battery and the capacitor and the lamp in series, the lamp will not be on (as the capacitor is open circuit in DC system) and when connecting the battery and th...

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What is the difference between Earthing & grounding?

chandramvs

 Profile Answers by chandramvs Questions by chandramvs

• Jan 3rd, 2016

Earthing and Grounding are nearly same where we connect the live parts of the machine to the zero potential(generally taken as ground or earth) in order to provide a bypass or excess or stray currents...

Rahul Patil

• Dec 24th, 2015

What is value of current flowing through earthing or grounding?

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What is the purpose of Q-point in transistor?

MADHUSHREE SINHA

• Nov 9th, 2015

It is a DC operating point between saturation and cutoff. It must be selected in a way that it does not go into saturation or cutoff.

bala

• Oct 24th, 2015

It is more important for a transistor because according to this value, it may operate as an amplifier or a switch and most importantly the point should not vary with temperature hence we normally prefer voltage divider bias.

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We are using neutral in Star Circuit and same in Delta Circuit is not used. What is the reason? Explain in brief.

Maheshkanna

• Nov 9th, 2015

Neutral is used to close a circuit but delta circuit is already closed so the neutral connection not used in delta circuit.

bala

• Oct 23rd, 2015

Normally delta connection is arrived by connecting two terminals of successive phase in a closed path and there is no common point of reference. But in case of star network one terminal is common to all phase thus creating a neutral.

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Why does Table Fan rotates Clockwise while Ceiling Fan rotates anti-clockwise? Any technical reason?

Nitin Banegaon

• Oct 29th, 2015

Normally, any motors rotates in anticlockwise direction as seen from non driving end. So in ceiling fan blades are attached to non driving end. So it seems to rotate in anticlockwise. While in table f...

shaik abrar

 Profile Answers by shaik abrar Questions by shaik abrar

• Jan 17th, 2010

When we provide supply to the stator of ceiling fan emf is generated. The set up of rotor and stator in ceiling fan is such that due to flux emf generated is in clockwise direction. As ...

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A) IDMT relay are mostly used for protection against?
1) Earth Fault 2) Inter turn fault 3) Overloading 4) None of the above

B) Which device is provided as backup of buchholz relay?

C) Name any two devices used for protection of power transformer against internal faults?

Manojkumar1990

• Oct 25th, 2015

A) IDMT relay is mostly used for the protection against overloading
B & C) REF & differential protections are used to protect the power transformer from internal faults and one of this both protections may used for backup of Buchholz relay.

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Why we are preferring 4 pole alternator in the production of electric power instead of 2 pole alternator ?

vijay kumar

• Oct 19th, 2015

Number of poles are chosen to get 50Hz frequency for a given speed. n=(120*f)/p

s.asokan

• Jul 28th, 2014

Speed is depend on number of poles and frequency. Commomnly all motors are used 1500 RPM and Indian standrad frequency 50hz also motor used 4 pole. In rare case nearly 3000 RPM (high speed motors, ht alternators) machines are used 2 poles.

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What is Phase Swinging or Hunting in Induction Motor?

Sushma vasudev ningappanavar

• Oct 14th, 2015

Swinging

Hari

• Oct 12th, 2015

When a synchronous motor is used for driving a varying load, then a condition known as hunting may occur. Hunting may also be caused if supply frequency is pulsating (as in the case of generators driv...

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Why 2-phase induction motors are NOT used in industries even though they have rotating magnetic field.

abhinav Kumar

• Sep 6th, 2015

Two phase motor essentially use in domestic use like water pump set ... It gives high torque and low efficiency. The phase diff 180 or 90 make the two phases with the help of capacitor.

anilsabaji

• Mar 11th, 2012

2 Phase motors have low efficiency and low power factor. There are higher chances of stalling.

MOST IMPORTANT: 2 phase load will create imbalance in the power system and high current and bulky too. Why should we use it when we have more efficient 3 phase induction motors

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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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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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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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