I don't understand why when we connect high voltage source in DC to electronic motor , we must add capacitor and resistor in parallel ? (I know that we use capacitor because we want to absorb the current that in the first second electronic motor in opposed with current course produce. ) what are the feature of Resistor and in such situation ?

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in three pin plug point, whats the reason that one plug point is bigger in size

4 Answers  

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Is there possible to Test Transformer for Overfluxing Capability. Or is there any firm who does Overfluxing Test on Transformer?

0 Answers  

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cause of failure of transformer bushes

3 Answers  

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what is working parincipal of a ht transformer

0 Answers   Pidilite,

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How to calculate PF capactors for a connected load?

2 Answers   FD, Power World,

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what is the formula for efficiency of francis turbine and generator for hydropower? what is best way to select francis turbine and generator?

0 Answers   HAL,

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what is motor?

2 Answers   UIU,

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What are the Formula of computing Back up Time of 500kVA UPS with 4 Battery Banks, each bank composed of 43 pcs of Batteries 12V150Ah. How to compute the Back up Time of UPS? We have also 3X500kVA UPS running in Parallel same composition as I write above.

0 Answers  

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I just purchased a 4 position cam switch to be used to operate a 3-speed blower motor. The motor is a 10 amp motor and has 3 wires that are used to control speed. The cam switch was rated at 660V 20 amps but when I received it, I noticed that it has AC-15 operational current rating (Ie) of 4/5 amps. If I am reading the label correctly. the 4/5 amps is related to 440v/220V (Ue). Other ratings are AC-3: 5.5A, AC2: 7.5A and AC-4: 1.5A. My questions are 1) Is it safe to use this switch with the motor I have 2) what is the difference between the 20 amp Ith ratting and the Ie operational ratings?

0 Answers  

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In a simple spur gear train, gears with 24, 48, 32, 72 and 96 teeth are in sequence. The gear with 24 teeth runs at 900 rpm. The speed in rpm of gear with 72 teeth is

1 Answers   Caterpillar,

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primary of transformer connected to Dc supply in series with switch, and secondary connected on ammeter, what happens when swith On and OFF. (or) if continuously On and OFF

9 Answers  

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