Answer / godwin

if it is ac machine p=vicospi for 1phase
p=root3vicospi for 3phase
in dc p=vi

Why carbon brush used in dc motor also why its not used in ac motor?

2 Answers   RRB,

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Give me the calculation steps to design an electromagnet to be work in 230V 50 Hz AC Supply. Also give force that is created by that electromagnet when it gets energized.

0 Answers   GE,

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we are operationing 3NOs 800 Kva generators by singronyus.specialey evening time our panel trip. the panel showing generator earth fault

4 Answers   RRB,

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Shall we get electrical shock if we touch the positive terminal of a 230 volt dc supply?

22 Answers   Essar,

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Please let me if star point(Nutral) of Delta/ Strar transformer, in 4wire (TPN+E) is tobe gruonded seperatly,inaddition to LV Panel earthing????

1 Answers  

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some meggers have three terminals. wat is the real function of the earth terminal?

2 Answers  

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a bulb of 100W and anather bulb of 200W , rated supply voltage 230v.when supply voltage is reduced to 100v,which bulb will give more light? and why with calculation?

12 Answers  

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What happen if the 24 volt DC supply is disconnected from air circuit breake ?

2 Answers  

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How can we reduce the reactive power consumption of your 12.5 MVA power transformer.

4 Answers  

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what is diffrenance between ACB and Isolator

3 Answers  

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hoW to select a CT?

4 Answers   BARC,

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need to make a report. Need to choose a 3phase induction motor. Load conditions motor will operate in : Maximum Load: 30 Kw Speed: 2950 rpm Ambient temp: 20 cent Supply voltage: 440V Frequency: 50Hz need to look for the safety factor when choosing the motor, went through catalouge found a few, but dont know how to choose the safety factor allowing an extra load something above 30 KW to avoid any harm.

0 Answers  

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