Answer Posted / tagore

AC signal has frequency. Frequency is no. of cycles per second. In general form 1cycle is drawn and visible. For more num of cycles cannt be visible as they were drawn on one another. For graphical rep. we use sinusoidal wave which is half circular shape each...

1. Why is the speed of shunt motor practically constant? 2. Why dc series motor use to start with heavy loads? 3. advantages & disadvantages of separately excited generator over self excited generator?

2550

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What is EMC filter in VVVF Drive ?

2737

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how we can calcultae the short circuit level for bus bar

2241

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how to convert lv line to hv line and viseversa, any losses will occur during this process

2074

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which types of relay used in acb and vcb?

2743

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I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?

2322

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why we get 2 differnet values for power factor in 2 watt meter method in 3 phase

1861

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2123

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What is the limitation of kirchoffs law?

1138

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2895

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Why derating factor os applied on Cables?

1962

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what about GD square and its important for motor design?

3830

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why we can use 1 to 5V dc

1963

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which motor have relatively high power factor and what is reason for have high pf? 1.capacitor run motor 2.shaded pole motor 3.capacitor start motor 4.split phase motor

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How isolater function when installed inelectrical 440V wiring

2245

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