Answer / mohan kumar

mot only violet glow it has.....when there is positive point
corona bluish white sheath or violet appears on conductor
surface but during negative point corona reddish spots will
occur on conductor surface

what will be the effect on the voltage .if power frequency is increasing or decreasing.

2 Answers  

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how to find the resistance and gap volatage of the diode??

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Is it possible to obtain 480v or 550v in single phase output by giving the input to 230v to a single phase torodial type transformer without using a stepup transformer?

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What is voltage ratio of a transformer?

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explain about the electrification in the Indian Railways? ie., how the power is taken and used to drive the train? explain with the block diagram??

1 Answers  

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How to calculate size of HT breaker with the help of Amp (current)? Please provide answers with examples.

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Why it need to form a capcitor when it not been in use from three or two year. Plz describe it technically.

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What is the effect if power factor is above 1 or unity.

15 Answers   NTS,

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how many power plants in andhra pradesh,how many types and there capacity

2 Answers  

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how LT meggar works

1 Answers   Essar,

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There are 2 motors without name plate and terminal but one is DC motor and another is induction motor.How one can identify which one is DC and which one is AC motor?

6 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.

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