what are the effects when the frequency is decreased in any ac machine

1 Answers  

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what is the differance between normal bybass & maintenance bybass in UPS?

1 Answers  

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why v/f ratio to maintain constant in speed control of induction motor?

3 Answers  

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HOW TO CALCULATE THE LOSSES OF CURRENT FOR LT CABLE JOINTING TO MOTOR SUPPLY.

2 Answers  

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What is the similarity and what is the difference between relays and PLC?

3 Answers   NTPC,

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Why we used 690V in ACS 800 drives.Why dont use standard voltage like 415v or 1.1Kv

0 Answers   India Cements,

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234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,

0 Answers   Jubail O&M,

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Define liftable weight of a transformer? Does the total weight of transformer include oil weight?

0 Answers  

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what is unit of inductance

12 Answers   Bhel, Bosch, OSML, Vijai Electricals, Voltage,

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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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If 24 KVA AVR having Input voltage 200-400v, Output voltage 415+-1%, what will be the voltage if Load is 13A.

0 Answers   Sterling Wilson,

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The power factor of the fixed load is 0.8, now the p.f is varying from 0.8 to 0.5.

0 Answers  

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