Answer / maroof khan

semiconductor is a conductor which conductivity lies
between conductor & insulator.
insulator does not allow the flow of current.

Answer / ramkumar

semiconductor conduct current only a.c positive half cycle
but insulator not allow to carry the current with in the
insulating level of that insulator.

Answer / palpandi.a

Semiconductor has 4 electrons in conduction band.due to the
doping it get or lose one electron.so it act as partial
condutor.But insulator has 8 electrons in conduction band.

Answer / sunil guru

There is difference in the doping of SEMICONDUCTOR AND
INSULATOR...
IN SEMICONDUCTOR the distance between the upper band and the
lower band is low...so the conduction level is high...

and in INSULATOR the distance betwn U.B AND L.B is HIGH.. so
the conduction level is low..

insulators sre ban conductors and semiconductors are good
conductors

Answer / phanendra babu

hai maroof,

the first statement of u is wrong because semiconductor
never becomes a conductor.

how to calculate of which rating transformer should be selected? take any example

2 Answers  

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in 400 kv system why should trip both side CB when we give hand trip?

1 Answers   KPTCL, NHPC,

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if we apply 1000ADC instead of 100ADC or We apply 50ADC instead of 100ADC,What will be happened in the test result value.Pl explain

0 Answers   NCC,

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why the carbon brushes are used heat created rotating parts in eiectricity

1 Answers  

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what are the type of transformer?

4 Answers  

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One of our gas turbine generator unit "1st stage rotor ground fault" alarm was occured several times. we tried to measure some voltage vulue ground fault protection relay (UNS3020a made by ABB and we measured the value of: Ground: 0.9VDC 5V: 5.8VDC 24V: 23VDC u+: 300 – 350mVAC Rf1: 17.5mVAC Rf2: 17.6mVAC The unit still running and the alarm was reset. As of 6pm yesterday and unitl now no alarm happened again. I our protection relay was defective?

1 Answers  

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Is it possible that Generator trip but Turbine not trip.Give explanation.

1 Answers   Essar,

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How is operate breaker failure scheme in substation

0 Answers  

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Pure inductive ckt takes power from AC when 1. Applied voltage and Current increases 2. applied voltage and current decreses 3. voltage decreases and current decreases please justify

2 Answers  

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If I have Energy Meter Ratio as 100:5 & Also I have CT Ratio as 50:5 then what will be my multiplying Factor(M.F.)

0 Answers  

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Why electrical engineer use Cu Strip for transformer neutral why not GI Strip? What if we use GI instead of Cu does it affects the transformer performance.

7 Answers  

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what are the advantage of UG cables over the over head lines

2 Answers   DVC,

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