what is the main difference between power devices and signal devices

0 Answers   Wipro,

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Why does inductor is connected to dc supply? or what is the role of an inductor when connected to DC source?

3 Answers   TCS, TRR,

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How the main bus bar rating of 400kV switchyard with one and half breaker scheme is calculated.

2 Answers  

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what is the best way to start a 15 KW motor for pump star-delta or direct on line ? and from how many KW i must use direct on line ?

1 Answers  

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why we use circuit breakers for switching instead of normal switching device?

0 Answers  

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The power supplied to a 50mH inductor from a 120V, 60Hz source will be

0 Answers  

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why we use REF and Differential Protection in one transformers?my doubt is both protections are operated in internal fault only.why we want to use 2 protections?please clarify.

7 Answers  

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How can claculate to attain the desired PF in the line ( HOW Much KVAR is required ) Pls Give the formula? Equate Petrochemical 0 1 how to calculate sizing of NGTR (Transformer rating,Loading resistor value and Current rating of resistor) and what is the X/R ratio. Details : 11kV,Capacitance 1.73532 micro farads,40kA for 1sec. 0 1 What will happened. if we feed 3phase supplay to the stater with out insert the rotor. How much current will flow through the stater winnding? Equate Petrochemical 0 1 What is required of exietation to the alternater. 0 1 why star point of HT motor not earthed? Equate Petrochemical 0 1 Why we are getting low voltage in star connection? Equate Petrochemical 0 2 What's ND relay & it's functions? Equate Petrochemical 0 2 How instantanious short circuit current is calculated? its formula? Equate Petrochemical 0 2 What is servo Motor? What's the advantages of this motor over Induction motor? Equate Petrochemical 0 2 What is core CT & it's function? Equate Petrochemical 0 3 what is meant by star/delta voltages as 440/220 in a 3 phase induction motor, and why it should be connected on STAR IN 3 PHASE SUPPLY L & T 0 4 What is required of exietation to the alternater. KNB 1 23 what is the design voltage for 6.6KV 2000 KVAR HT capacitor? Consultancy 0 3 Pls explain about vfd control?Where it is used, Give some example? siemens 1 22 Please explain me abt PQ diagaram in the power sector. 0 9

0 Answers  

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how power saving takes place through VFD?

9 Answers  

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Two alternators say 1 & 2 are poised to parallel operation. But at the time of paralleing alternator 2 gets out of the system by tripping Earth fault relay. Please send me reply why this is happening?

2 Answers  

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why ht alternators gland plats using brass?

1 Answers   ONGC,

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how to cal calculate capacitance in DC Circuit

1 Answers  

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