What is difference between MCB,MCCB,ELCB and RCCB? Brief description and why RCCB is costly?

3 Answers   JLL,

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A 400 V, 50 Hz, Δ connected synchronous generator has a field reactance of 0.1 Ω and armature resistance of 0.015 Ω. At full load, the machine supplies 1200 A at 0.8 pf lagging. Under full-load conditions, the friction and windage losses are 40 KW and the core losses are 30 KW. What is the machine’s overall efficiency? Ignore any field circuit losses.

0 Answers   VECL,

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WHY WE USE SIEMENS plC

3 Answers  

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what is the transformer turn ratio formula and give some examples?

0 Answers   UPPCL,

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Hi friends I am a service engineer in electrical field i plan to shift design engineer in same field, so i request your suggestion for what software or course i want to learn ?

5 Answers  

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single sphase energy meter measur

7 Answers  

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why VCB are not used in 132KV system(above 33KV system)

6 Answers   Al Ahleia,

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Dear sir, we are getting voltage fluctuations suddenly for 2 or 3 minutes again it becomes normal. we checked each and every connection some times we are getting 110 volts like that from earth to neutral again it is reducing we are getting supply from 45 kva DG set give earthing properly.

3 Answers   Triveni,

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why transformer do not rotate?

3 Answers  

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why field resistance is higher than armature resistance in dc machines? and why filed resistance is kept at min value at starting in same time of armature resistance at max value?

4 Answers  

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why ct secondary side shortlink provided? its open what will happen?while running ?

2 Answers   Essar,

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what is humming noise and wha is the reason to develop humming noise in a mv pannel ?

2 Answers   HPL,

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