Answer / r.k. gupta

We are using IGBT & SCR in UPS system because these are high frequency switching with high current devices. which are used in UPS for inverting the supply from DC to Ac during battery backup of UPS. 

What is the implications when 600 hp motor is started when the unit is running with Transformer of capacity 1500 KVA and DG set of 1000kva

0 Answers   Shasun Chemicals,

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WHY MOSTLY BATTERY VOLTAGE IS IN MULIPLE OF 2 LIKE 2V,4V,8V,16V,18V....

2 Answers   Exide,

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how many types of dc batteries standards are present?

2 Answers  

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Why Generator rotate only clock wise ?

8 Answers   L&T,

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why rating of generator is kva but motor is kw ?

4 Answers  

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what is ICU and ICS in breaker ratings

1 Answers   QAFCO,

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why permanent magnet generator have higher frequency of 400hz

3 Answers   Jaypee,

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AC voltage only create magnetic flux in coils, but in Solenoid coil how 24V DC volt create flux and pick the plunger

5 Answers  

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Can anybody tell abt concrete encased earthing or grounding?

0 Answers  

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What is hysteresis losses?

2 Answers   GMR,

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what happen if the supply is given to the stator of the 3phase induction motor with out assembling the rotor ?

0 Answers  

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what is rotatng magnetic field in case of three or multiple phase alternating current machines???

1 Answers   NHPC,

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