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How size of UPS depends on frequency?
How size of UPS depends on frequency? I mean proportional, inversely proportional or proportional to square of frequency?
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Electrical Wiring and Circuit Questions
1)How much current can a 3-1/2 core 100 mm wire carry? 2)What is the latest generation of circuit breakers called? 3)What are the special cables required for explosion proof wiring? 4)What are the different types of soft starters for large motors? 5)What is the similarity and what is the difference between relays and PLC?
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Electric motor start-up
Why there is a fivefold increase in a current at electric motor start-up?
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Transformer Neutral Earthing
why the transformer neutral point connected to earth?
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Reactive Power
why the reactive componet is generated in power system?
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Earth Fault
what is the technical difference between earth fault and earth lekage relays ?
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Contactors in circuits
why we use contactors in ckts....how many types of contactors are there.. how we select the contactor for in ckt for its operation
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How does a generator generate reactive power
Does it absorb reactive power when ever it is needed ?
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American Distribution System
What is the difference between American and Indian distribution system? Which one is better and why?
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Power Measurement
Why current coil and pressure coil of wattmeter is connected in different phases for reactive power meaurement?
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DC Generator Brush
Why the brush is fitted in M.N.A axis? What is its effect on speed?
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Phase Advancer
Why Phase Advancer is not used in below 200kva machine?
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Transformer Humming
What causes transformer humming?
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Heater Effect on Bulb
If Heater of 1000W is connected in series with 60 W bulb. what is the effect on the bulb.
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Power Supply Phase
Why do we use a single phase and a three phase power? Why dont we use two phase or four phase upward?
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Distributed and Concentrated Winding
What is meant by distributed winding and concentrated winding?
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Two Phase Induction Motors
Why 2-phase induction motors are NOT used in industries even though they have rotating magnetic field.
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Induction Motor Rotation
How we can change the direction of rotation of Induction motor?
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Hysteresis Loss
What is the effect of hysteresis loss in transformer/machines especially in DC one?
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Power Generation
What measures will take for cost saving in utility and power generation
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Power Consumed
If v=220V, I=25A, power factor=0.8, frequency=400Hz. If the motor runs for 3 hours, What is the power consumed?
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Capacitor Connection
Why the capacitors are connected in delta? What advantage it having than star connection?
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Reactive Power Relation with Alternator
How reactive power is related to alternator? Wheather it is generated or consumed? Explain
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Induction Generator
Is it possible to run the induction generator only with the inductive load (without the use of capacitors for supplying the reactive power)? Explain
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Transformer Voltage Regulation
Which of the following test are to be conducted for the determination of voltage regulation of a transformer.a. Load Testb. Short Circuit Testc. OC Testd. Retardation Test.
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APFC Panel Circuit Fuse Units
Why We should use only Fuse units in APFC Panel circuit instead of ACB/MCCB/MCB?
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Save Power
Suppose the electricity board gives 11 kw, but the machine requires only 8 kw in such case how can we save the excess power?
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Voltmeter Measurement
If we connect a voltmeter between earth and ground wire, how much it will measure?
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Synchronous Machine
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?
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Induction Motor
Why transformer does not rotate like induction motor. Inspite both having same principle?
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Electrostatic Power
Is it possible to generate electrostatic power? If yes, how?
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DC Circuit in AC MCB
Does using a AC MCB in a DC circuit affect the tripping time or the perfromance?
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PNPN Thyristor
Why PNPN is used as thyristor NPNP is not used?
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Wattmeter reading
Why does wattmeter's reading go negative?
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DC supply to Transformer
Why the transformer will burn if DC supply is given?
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Earthing and Grounding
What is the difference between Earthing and Grounding?
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Alternator and Generator
What is the diffrence between Altrnator & Generator? Outline its working principal.
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Potentiometer and Rheostat
What is difference between potentiometer and rheostat?
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Earthing & Grounding
What is the difference between Earthing & grounding?
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