Answer Posted / k.prakashchandra

Short the LV side ,increase voltage on HV ,till you get the rared current. The percentage of this voltage against rated voltage is % impedance . if you connect a watt meter you get copper losses . With open circuit apply rated voltage ,to measure the iron losses with a watt meter .

why the arc welding machines require parallel earthing systems? ie why each machines are connected to earth pit by separate wires during earthing? wats it adavantages?

2210

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what is the use of the puls transformer in UPS & how it works???????????

2224

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The inventer is a battery, but if lost current at home u will turn on the fan but the is AC and inventer battery is dc . Then how the fan was rotating. What device Or machine in fan converst the Dc power to Ac power

1162

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In what condition the HT fuse breakes?

2023

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WHY IS THE EARTH FAULT CURRENT ALWAYS LESS THAN THE NORMAL CURRENT??

2228

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at work we have a 3 phase motor but on testing one phase isnt getting a reading. it runs 24 hours a day all week. stops and starts well no noise or heating. the phase isnt down to earth.is it just a bad meter reading or not? phases one and three came up with a resistance reading of 0.4 but phase 2 couldnt get anything shows up as open circuit.

1667

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How many wall/floor flange will i use in bus duct system if we have in our design a 35th floor building.

1498

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Whether IP65 enclosure box blocks ventilation if driver for LED have to enclosed inside IP65 box

2097

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give me atleast four differences between circuit and network

2181

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What do you mean by a phase angel of instrument transformer?

1116

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what is d check in dg 1500kva

2125

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I am inpecting a 10kVA UPS what tests should i do and should i observe?

2217

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mccb service sittings be done?

1959

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what is the difference between ups & inverter

7159

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what is gridrotor resistance starter

1878

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