WHAT IS THE USE OF PIG TAIL IN WINDOW CT ?

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7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?

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What is the difference between a Junction Box and a Marshalling Box?

8 Answers  

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if the motor rated speed is 950rpm. how to change the above rated speed? is it possible?

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how to check dc current,how to fix ammeter in dc line

5 Answers   Gold Fields,

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Is there any thumb rule for cable selection for any current rating ?

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how can we say that stator magnetic field rotates with synchronous speed?can we derive?

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1 unit or 1 kwh means how much kva

7 Answers   TATA,

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why the vector group of excitation transformer is YD5(150 deg)how is this factor decided.

1 Answers  

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Does induction motor start with dc power supply????

4 Answers   Essar,

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The ohm is the unit of:(a) Charge(b) Resistance(c) Power(d) Current

2 Answers  

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EXPLAIN WORKING PRINCIPLE OF ALTERNATOR & MOTORS.

2 Answers   L&T,

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