Answer / Ram Prakash Soni

RRB (Railway Recruitment Board) does not provide specific previous year question papers for individual posts. However, you can find sample question papers and study materials on the official RRB website.

1. If we apply dc supply to the primary winding of transformer it will be burnt out. similarly dc supply is given to field winding of syn. motor and armature winding of dc motor, they are safe. (Remember both windings inductive nature) what is the reason behind that?

2 Answers  

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HOW TO CALCULATE GROUND FAULT CURRENT IN 430V 4000AMP AIR CIRCUIT BREAKER?

2 Answers  

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why we test the core balance of the transformer?

1 Answers  

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why most of junction box vendors providing T5/T6 Temp class jb's for T3 area any special reason?

1 Answers  

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in 132 kv substation ligtning arrestor(120 kv) connected to line. but line voltage comes to 132 kv, it operate or not???

4 Answers   Divis Laboratories,

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defination of a.c filter

0 Answers  

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Shall we use Dyn1 transformer in place of Dyn11 for motor application as a distribution transformer

1 Answers   NSL Sugars,

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What is the purpose of reactor.why we used in over head line?

2 Answers  

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How to Convert horsepower to kva? what is the three phase formula? email me if u know thanks Rehan smileavail@msn.com

3 Answers  

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what is reactive poower

3 Answers  

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What is different between Metering CTs and Protection CTs?

4 Answers  

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how to calculate energy of 3-phase motor?

1 Answers   Suzlon,

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