what is the function of step up transformer?

2 Answers   DEWA,

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What is the difference between online and offline UPS

1 Answers  

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My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I -    is the value of AC fault current. t -    is the operating time of disconnecting device in seconds. K –  is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.

0 Answers   Premier,

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how to check the continuity of a cable with a megger

4 Answers   Metro,

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please mention the minimum IR value for different voltage systems

6 Answers  

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What is difference between slip rings and carbon burushes?

2 Answers   Hyundai, IVRCL,

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How does the phase sequence controller works, how it identifies the phases? confirm working principle

0 Answers  

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1. what is exciting winding, rotor winding, startor winding. and how it works? in ac generator

3 Answers  

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Why ACB is used in LT why not in HT and why VCB is used in HT why not in LT

1 Answers   GE,

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Mention what are the types of semi-conductors?

0 Answers  

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Do these factors (settling time, peak time, steady state error, overshoot, rise time, MPOS (Maximum percent over shoot)) are the part of first order, second order, higher order, linear, non-linear, open-loop, closed-loop, homogeneous & non-homogeneous systems ?

1 Answers   Limton,

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sir, I am from EEE branch.On feb 17 iam going to write an Exam for hindustan petrolium corporation Ltd.So plz send me the written exam pattern/Q's/interview questions.please mail to eee_dharmendra@yahoo.com

0 Answers  

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