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Quality Factor
What is the importance of quality factor in resonance?
thakur.rajesh.ranjan
- Sep 27th, 2010
Sinusoidally driven resonators having high quality factor resonates with greater amplitudes but have a smaller range of frequencies around that frequency for which they resonates. Thus a high Q (quali...
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Corona Effect
What is corona effect ? How this is avoided in transmission?
silverscythe
- Jul 2nd, 2010
Corona Effect is the high voltage electric discharge phenomenon that can be observed between two transmission lines or for that matter any two lines carrying electricity. This occurs generally when th...
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Convert Single Phase to 3 Phase
How to convert a single phase supply to a 3 phase balanced supply?
raviiisc
- Jul 14th, 2010
The are two methods.1. First convert 1-ph AC into DC by using converter, then that DC is converted to AC by using the power electronic circuit named as three phase inverter using any modulation t...
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Synronizing Degree
In which degree synronizing has to be done in a 3 phase alternator?
mgbushan
- Aug 24th, 2010
When you have to synchronize the alternator with the reference bus, then The voltage, Phase angle, frequency difference of the alternator with refernce to the bus reaches within the tolerable set...
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Quality Factor in Resonance
What is the importance of quality factor in resonance?
sujit.185
- Aug 5th, 2010
QUALITY FACTOR actually signifies the voltage gain or voltage amplification factor of a given ckt.
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DG Set Tripp
What will you do when D.G. set gets tripped?
Raman Jain
- Jan 3rd, 2011
First see at what indications D.G set get tripped. Find the cause and rectify . Than again start the DG set.
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DG Set
What do you do if your DG Set is not taking load?
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Transformer Reactive Power
Though transformer consist winding which usually cause reactive power change in both generator and motor but it wont affect reactive power passing through transformer why?
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Bulb Power
The bulb has a rating of 500W for 220V, if the voltage is 110V, What is the power of the Bulb?
mohit parashar
- Jul 28th, 2010
Given:p=500WV=220VP=VII=2.27Athan by ohm's lawV=IRso R=96.91Ohm which is constant.if V=110Vthan I become 1.135AsoP=VIP=125W.
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Electrical Machine Harmonics
What is harmonics and how they are produce in electrical machine?
ravs42
- Aug 6th, 2010
Harmonics are the integral multiples of the fundamental values of current/voltage quantities. Generally it is caused due to non linearity caused by the load which adversely affects the supply side. Main impacts occurs in capacitors, telecommunication lines, power transformers, etc.
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Phase Usage
Why and when we use single phase and three phase?
raviiisc
- Oct 31st, 2010
This is the most common question.Whenever we are dealing with large quantity of power we use the Three phase system rather than the single phase system. The cause is the cost of eqipment is more....
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Induction Motor
In single phase induction motor, what is phase? what is induction? Why only this motor used in fans?
guntur.srikanth
- Sep 30th, 2010
Mainly the induction motor works with mutual induction principle that is why we are using them in fans
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Power Plant
What is the processing of power plant and what are the equipment used for coal handling power plant?
Raman Jain
- Jan 3rd, 2011
There are various equipments used in the Coal Handling Plants :1. Wagon Tipplers : to unload the coal wagons2. Stacker - Reclaimers : stack and reclaim the coal in/from stock yard.3. Conveyor Belts : ...
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Relation between mutual flux , useful flux & Power factor of a Transformer.
If mutual flux is 1.2 Wb, power factor if 0.8 lag, then what is the useful flux of a Transformer?
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Three Phase Transformers
A 3phase wye/delta transformeris rated 225kV/24kV, 400MVA and has a series reactance of 13.3ohms as referred to its high voltage side. The transformer is supplying a load of 325MVA at 0.9 pf lagging at a voltage of 24kV(line to line)on its low voltage side. It is supplied from a feeder whose impedances are (0.15+j1.5)ohms connected to its high voltage terminals. For these conditions calculatea> The...
mahmoudp1
- May 10th, 2012
???
incorrect information
you should specify at least on of the terminals voltages -
Motor Vibration
What can be the possible causes of Vibration in HT motors?
Raman Jain
- Jan 2nd, 2011
Vibrations in HT Motors may be due to several reasons :1. Mis-alignment 2. Worn Bearing3. Loose foundation bolts.4. Unbalance rotor etc.
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Phase Advancer
Why Phase Advancer is not used in below 200kva machine?
bittu123
- Nov 8th, 2011
During starting or low load condition IM works on very lagging current which results in taking high current. This sudden high current may creats transient in power system, which is undesirable. Phase ...
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AC Generator
To induce EMF, either field has to rotate or rotor has to rotate. In Alternator, AC supply is given to the armature to produce rotating magnetic field. The rotor is rotated by the prime mover. Then how will EMF be produced in an alternator. Explain the working principle of alternator in detail?
manilal.r
- Jan 2nd, 2011
Like a DC generator, an alternator also has an armature winding, but there is one importent difference between two, in a DC generator, the armature winding placed on rotor in order to convert AC? to ...
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Alternators
Which slots does a stotor of an alternator rarely uses?
veerateja
- Jan 22nd, 2011
Open type slots are used in synchronous motor or alternator because to reduce the leakage reactance and leakage flux,which increases if closed slots are used.
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