Answer / saran

fire alarm control panel

What is annunciator ?

1 Answers  

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hai iam arunkumar. i have applied for an section enginner in rrb. i want lat 5 years solved question papers. if u have please sedn it to arun30682@gmail.com

0 Answers   RRB,

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How should i design a 1ph & 3 ph transformer. Kindly let meknow all steps and formulaes related to design from scratch.

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We store the d.c supply...then why can't we store A.c supply???

4 Answers  

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In 110V DC supply,if a closed circuit gets open, How can we identify the voltage which is measured after the resistor(4KOhm) which is open with negative.it shows 55V +ve when measured, also the actual positive source is 55V +ve .Because there is no voltage drop in open circuit. How can we identify whether this is the voltage which is series with the resistor or the DC source direct +ve.

1 Answers   GE,

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we have one pumping station and 4.6 MW 7 no.s synchronous motors.so there is no required HT capacitor to improve power factor.But we have two no.s of 25 Mva power transformer connect to distribute the power for motors connect with 220 kv line.So i have required the HT capacitor to improve power factor at HT side i mean power transformer bus side.So please suggest how much HT capacitor banks required for same.

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How to check phase R,Y,B

3 Answers  

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11 kg trivevter meter has rating of -/5amps. And pt ratio11000/110v and is connected with 11kv ct/pt unit of cr ratio 75/5amps. And pt ratio of 11000/110v while checking accuracy of meter with HT Accuchek meter what value of PT ratio and CT ratio to be filled in Accuchek meter

0 Answers  

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what are adantages of OC and SC test over the load test?

5 Answers  

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what is ic 01,ic 06 ?is it types of cooling?

0 Answers   Bhel,

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what is demagnetising effect & crossmagnetising effect and how it is related to electrical system?is there any more effects are available or only these two??

1 Answers   Telco,

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why transformer fuse wire is very thin as compared to home fuse wire while voltage lavel is low

1 Answers  

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