Answer / k.prakashchandra

Its first function is strike arc across the tube by inducing
high voltage with the help of starter and the second is to
limit the current as the resistance across the tube becomes
zero after the arc is struck.

Answer / thowsif_emerson

Unlike incandescent lamps, fluorescent lamps always require
a ballast to regulate the flow of power through the lamp.

What is the differentional relay...what is the work of this in power Tx. how it is works..

0 Answers   ABB,

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What will happen if the d.c. Shunt motor opened accidentally running on no-load has its shunt field winding?

0 Answers  

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WE know that for Inductor X=2pifL,In DC f=0,then X=0 so,V=IX=0;But In the DC excitation of rotor of AC generator,DC motor field coil which coils are inductor so why does not applying DC voltage short the rotor coil of AC generator and field coil of motor?If it would then DC source might be damaged but it is not happened. Why does the strand conductor of Electrical power transmission line make twist?

0 Answers  

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How to size a transformer which will supply power to 550kW,690V motor starting with VFD?

1 Answers  

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how to check the LRS resistance .......................

1 Answers  

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Why ferranti effect occurred in leading p.f load?

1 Answers  

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What are the functions of temperature scanner in power transformer?

0 Answers   HCL,

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What is an iron loss or core loss pi?

0 Answers  

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what is the principle of switchgear and its function

1 Answers  

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we have provided 30 nos. relay contacts in panel.I want to know how do we do the numbering for the relay contacts as per any applicable standards

0 Answers  

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write circuit diagram for a motor rotate in forward direction once it started and when pressed the same button it should rotate in anticlockwise.

0 Answers  

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A group of machines (wind turbines) connected with 33KV feeder and each machines are having individual VCB. The 33KV feeder connected with 110KV/33KV substation. The 33KV feeder tripped by over current at Substation and fault recorded at Substation as OC-R&Y phase. Same time the group of machines VCB tripped by over voltage, the fault recorded voltage was above 66KV by numerical Under/Over voltage relay. While grid drop time, this much of voltage hike is possible?

1 Answers  

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