Answer Posted / biswajit sahoo

unless you are not mention rpm you can not predict no of
poles with voltage and frequency

I am shobana from Chennai. I am having my personal interview on 19th Dec at Chennai.kindly mail me the questions to mail id shobana.shanthi@gmail.com

2323

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I have a small system with two motors that are running on 380 vac, 60 hz. These motors are expensive and I usally get them from Brazil. I am adding another motor to the system, but I want to purchase a 480 vac, 60 hz motor to use. It will be on a VFD that is rated fro 380 thru 480. Is this posible and will I have to use a larger motor and derate it?

1913

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what is basic difference betmeen normal & flame proof motor??

1957

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Does the direction of rotation of d.c. Shunt motor would get reversed if the armature current and field current both are reversed?

1092

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can u tell me the promotion from oiller to enginer

1878

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What are the commonly used schemes for the bus zone protection?

986

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what is difference between isolation and ultra isolation transformer?, what is the method of testing ?

4279

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How to confirm the Phase shifting Transformer VECTOR GROUP relation , as below ZNy11.45d10.45-ZNYy0.15d11.15

3206

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how to find the resistance and gap volatage of the diode??

1984

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HOE WE CAN IMPROOVE BY USE OF CAPACITOR

1905

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whate is the meaning of balance/unbalance,in stabilizers type

2092

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plese send me the oces/dgfs sylabus and previous year question pattern of electrical engg.?

2255

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please write motor, transformer, Generator setting, fault level calculation of Tr.etc

2008

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Can the output voltage of a rectifier be greater than the input AC voltage without the use of any voltage multiplier in the circuit??please provide the explanation too..

2060

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PAC and simple Ac different

1451

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