Answer / rabi

When starting the lamp, a glow discharge will appear over
the electrodes of the starter. This glow discharge will
heat the gas in the starter and cause the bi-metallic
electrode to bend towards the other electrode. When the
electrodes touch, the two filaments of the fluorescent lamp
and the ballast will effectively be switched in series to
the supply voltage. This causes the filaments to glow and
emit electrons into the gas column by thermionic emission.
In the starter's tube, the touching electrodes have stopped
the glow discharge, causing the gas to cool down again. The
bi-metallic electrode also cools down and starts to move
back. When the electrodes separate, the inductive kick from
the ballast provides the high voltage (about 1 KV) to start
the lamp.

how a.c. genarator control power factor when its conected to grid supply by incrising or decresing excitation voltage.

1 Answers  

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1- XC and the RC time constant are both measures of the reaction of C to a change in ____? 2-The power factor is a numerical ratio with a value between 0 and 1 equal to the ______________ of the phase angle. 3-When V and I are out of phase because of reactance, the product of V times I is called ______________ power 4-For _____________ inductors, the branch currents can be added algebraically. 5- The ______________ power in watts can be calculated as I^2R 6-Calculate XL with L = 30mH and f = 1kHz ( I have Xl=2piFL 2*3.141592653*1kHz*30mH =188 ohms Please check) 7-A parallel RL circuit has the values, R = 5kohms, XL = 5kohms. A voltage source of Vt = 10Vrms is connected in parallel to R and L. Determine the total current, It delivered by the voltage source Vt. 8-A series RC circuit has R = 1Mohm and C = 1microF. How long would it take for the capacitor to fully discharge if it is initially fully charged? 9-A circuit has real power = 300W and an apparent power of 500VA. Determine the power factor and phase angle. 10-The time constant for an LR series circuit is T = 0.1s and R = 10ohms. Calculate the inductance L.

0 Answers  

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what is inverter and converter

7 Answers   Shrishti Power Technologies,

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A 11000/415V distribution transformer is fed 415V upon it's LT side,Do I get 11000V upon it's Primary side ?

7 Answers  

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Why DC current is not used in transformer?

20 Answers   JK Paper, TCS,

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What is the reason of polyphase induction motor tripping suddenly on high current during running at 70% laod? Motor IR , winding resistance & inductance balance. Motor no load current is balance and ok as per mgfr. data.

0 Answers   GNFC,

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How to calculate the electrical load for a standard telecom BTS shelter and capacity of DG set required to cater to this load?

3 Answers   Bhel, INDUS, Indus Towers,

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what is the reason for balance of voltage in magnetic balance test?

2 Answers   Reliance,

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Could the power factor on electrical system can affect the registration of the kwhr meter or the CT/PT? 

0 Answers  

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How To Convert Apparent Into Real Power Without Knowing Reactive Power?

0 Answers  

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why capacitor burst?

2 Answers  

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what is the principal of ceiling fan and how it will rotates? what is the magnetic momentum produces inside the fan?

1 Answers  

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