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. 

how to choose cable size with respect to load? how to convert cable size in mm2 to sq.mm?

2 Answers   MSL,

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Why 11KV/440V distribution supply use for Domestic use?

3 Answers   Essar, Getco, Nissan,

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How do u term the word 'OF' in Megger Testing???

2 Answers  

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Which capacitor is used in ceiling fans ?

1 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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ohms law is applicable for dc or ac current or for both??? explain it berifly??

3 Answers  

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where AVR is connected in power plant.

7 Answers   ABB, Saudi Red Bricks,

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why we use star connection in HT motor? and delta connection in LT motor

2 Answers   npcc,

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types of central Air conditioner plant?

0 Answers  

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It is advisable 2 use auto-transformer if transformation ratio is-a)110KV/11KV,b)230kv/110kv,c)110kv/66kv,d) 400kv/230kv

2 Answers  

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which type of motor is suitable for water suction pump ?

4 Answers  

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Yazaki india pvt ltd interview questions qurey related

0 Answers  

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