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Co-operative switching
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
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Roles and Responsibilites of Electrical Engineer in Cement Plant
What are the roles, responsibilities and work of an electrical engineer in a cement plant?
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Star or Delta Transformer Selection
How can we chose transformer star to delta or delta to star connection? What condition is suitable for star connection? What condition is suitable for delta transformer?
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Electrical Power Factor 0.4
If you are an electrical engineer in a factory what will you do if you found power factor 0.4?
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Over Exited Alternator
When alternator is over exited, the power factor will be
a. Lagging
b. Leading
c. ZeroDipti Ranjan
- Mar 7th, 2016
Pf is lagging because A.R is demagnetizing.
pradeep1987
- Jan 31st, 2016
It is lagging. When the alternator runs at lagging power factor, the armature reaction demagnetize the main field flux. To compensate the extra magnetic field required so that the alternator is Overexcited
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Can Neutral be Earthed at Load Side?
Neutral is connected to Earth at the source to ground, the unbalanced current in the electrical network mainly in distribution system, What happens if we connect neutral to earth at load side DB?
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Convertion of Energy
Can mechanical energy be directly converted into electrical energy? Explain
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What is the reason of power development in synchronous generator due to saliency ?
abishgk
- Aug 13th, 2010
In salient pole synchronous machine has non-uniform air gap so the reactance will vary with rotor position. It has mainly two axis are there 1. Direct axis 2. Quadrature axis.
santosh soni
- Dec 21st, 2006
IN SALIENT POLE SYN. ALTERNATOR IT IS THE CHANGE IN THE RELUCTANCE WITH SPACE WHICH RESULT IN GENERATION OF BOTH RELUCTANCE POWER & ELECTROMAGNETIC POWER.
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Does HVDC mode of transmission has an economic advantage over EHV-AC transmission. Justify
sainathdi
- Aug 16th, 2009
HVDC- High Voltage DC Transmission system ,from the name itself we can say that its a dc transmission system and a dc transmission has two conductors one phase and other neutral. phase conductor is us...
venky_sastra
- Dec 28th, 2008
HVDC means high voltage DC transmission. Usually when we speak in common terms power p=I*I*R therefore p is propotional to I*I, A high voltage will generally involve low current so as a result the power losses are less. So it has an economic advantage over EHV-AC transmission.
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Large Size Synchronous Machines
Why almost all large size synchronous machines are constructed with rotating field system type?
Rhombus
- Jun 11th, 2011
All the large size synchronous machines have rotating field winding because in the other case where armature is rotating we require four slip rings.. but in case of rotating field we can do with only..2 slip rings..!! :):)
veerateja
- Jul 11th, 2010
Large size synchronous machines or Alternators have rotating field winding on rotor for many reasons of them the important reasons are:- 1. The rotor can rotate at very high speeds. 2. The voltage reg...
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Hysteresis Loss
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
- 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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Phase Conversion
List various methods to convert 1 phase to 3 phase.
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Touch phase wire
Can we Touch phase wire in air when we r not touch ground what happens
amolgaonkar
- Dec 9th, 2011
When you touch the phase wire in air the current will enter your body but it will have no way to escape or complete the circuit thats why you will not feel the shock...the best example is you might ha...
Tarun Aggarwal Ymca
- Jul 22nd, 2011
only high potential cannot cause flow of current. So, when a Human being touch such a wire, its whole body is at a high potential, but due to the absence of a lower potential, the current cannot flow....
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What is the voltage drop for 100kw motor if the length of the cable is 200m and what is the cable size.
soumendasbiswas
- Oct 21st, 2009
1.The (0.48) is it resistivity of conductor ? or any other value Well here 0.48 is the estimated voltage drop in XLPE cable.(You can get this value from any cable manufacture catalogue)2.You hav...
mustafa_musvi
- Oct 20th, 2009
Mr Biswas please specify Below is the case you mentioned regarding cable losses I have 2 questions request for your answer1 The (0.48) is it resistivity of conductor ? or any other value 2 You hav...
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When we connect the capacitor Banks in Series with the circuit
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Editorial / Best Answer
Answered by: cvk
- Oct 6th, 2007
The series capacitor is conected to compensate for the line inductance and thus decrease the line reactance so that more power can be tranferred through the line (EV/X sin(delta)) and thus the system stability can be increased.
cvk
- Oct 6th, 2007
The series capacitor is conected to compensate for the line inductance and thus decrease the line reactance so that more power can be tranferred through the line (EV/X sin(delta)) and thus the system stability can be increased.
its_Kishu
- Mar 10th, 2007
Hello...... The question is about connecting Capacitors in SERIES. Series connection is done for improvin...
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When there is a sudden loss in the demand what happens to the transformer and generation?
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Editorial / Best Answer
csbalu- Member Since Aug-2009 | Aug 29th, 2009
When there is a sudden loss of load, The Generator terminal voltage increases due to the fact that the IX drop in the generator winding decreases. The EMF generated being the same the reduced reactance loss leads to a sudden rise in generator voltage..but the AVR (Automatic Voltage Regulator) will act instantly to bring this voltage to the set value by reducing the excitation.
There is practically no effect of this on the transformer barring the reduction in I2R (copper Losses) and reduced IX drop.csbalu
- Aug 29th, 2009
When there is a sudden loss of load, The Generator terminal voltage increases due to the fact that the IX drop in the generator winding decreases. The EMF generated being the same the reduced reactanc...
spcspc1654
- Jul 19th, 2009
When there is a sudden loss in the demand then there is over-excitation of the generation and the power factor is increased. Also the rotor angle of generator is changed (unstable) for a while.
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Electrical Engineering Interview Questions
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