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how we can varying the speed of dc motor ?

speed of the motor can be varied in two methods
1)by armature voltage control method
2)by field voltage control method

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what happend to DC shunt motor if its field winding insulation becomes slightly weak? will that motor can run on full load or not explain in detail. thanks

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How will polarity test of Dy5 Transformer ?

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hi I have done 3 yrs diploma in electrical engg after 10+2. I have 16 years of work experience into design proposals sales and engg application development in LV/MV swithcgear and sub station automation field. I want to apply for immigration to new zealand but I am not sure whether I qualify or not since I dont have a degree. Can anyone advice? Thanks Riz

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In a tap changing transformer where is the tap connected, is it connected in the primary side or secondary side?

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what are the breakdown voltage rating of mini- curcuit'transfarmer!

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We have 250 KW x 2 motors, which are load from 25% to 100% varying load in every minute , so how can we compansate the power factor. pl give your opinions on the above subject.

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which is better to use svc or synchronous condenser why ?

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how can i determine the gear ratio for a rack and pinion system if an electronic gate operated by an electric motor is to travel a distance of 5meters in 15 seconds.

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How npn and pnp transistor works

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How to define Kirchhoff current law and voltage law along with simply examples.

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