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 an Isolation Transformer? Where it will use?

3 Answers  

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Hi guys! Plz help me to answer the following questions. 1. What are the types of transmission line energy losses? 2. Why are the VLF are used some types of services? 3. What frequencies are used for reliable beyond the horizon terrestrial communication without repeaters? 4. To permit selection of 1 out 16 equi-probable, what is the number of bitis required? 5. What is the most common modulation used for telegraphy? 6. What is the multiplexing is used to increase the capacity of the optic fiber? Thanks

0 Answers  

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What is the d/f between DOL & star delta starter & automatic star delta starter?

23 Answers   ACC, Dalkia, Engineering, Indeco, NINL, Novotel, RMH Control Systems, Wipro,

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How to find out damper winding failure for synchronous machine?

0 Answers  

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what s a servo motor? how to control the servo motor? and its application, purpose of using?

2 Answers   Arabian Pipes,

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what is charger supervision and control supervision?

0 Answers  

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why neutral should connect to earth in delta-star type transformer

4 Answers  

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what are the points to be consider for MCB(miniature circuit breaker selection?

3 Answers  

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How to protect the water pump by no load running.

9 Answers   Cushman Wakefield,

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What is the meaning of floating point earthing in battery backed systems ?

0 Answers  

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What is domestic transformer? Draw the connection of domestic transformer.

0 Answers  

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fuses rated by amperes but not power,why?

3 Answers   Blue Star,

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