Why we use duplex coil and hook switch in telephone system?

0 Answers  

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how to select cable size?

7 Answers  

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a motor's measured current is 45amp,whereas the rated current is 38 amps but still it is running ,how?

5 Answers  

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what is the application of dynamic Breaking resistor in inverter ? & How it works ?

2 Answers  

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What is the major differences between RCCB & ELCB? If we use ELCB of less sensitivity why does it trip often and can we control it from tripping?

1 Answers  

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what is the knee point voltage ? what is differtial rela? what is impedance and % of impedane? what is the postive phase sequance ? negative phase sequane ? and zero sequance impedance ? what is sortcircuit calculaion? why take calculation? define stabilty test ? why? what sentivity test? define merz protection ? what is the burden ? class 5p10, accracy, metering ct take knee point voltage test thet time what heppan why dont take knee point test to metering ct?

0 Answers  

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why transformer ratinh is in KVA????/

8 Answers   Apollo, Priyadarshini, Reliance,

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Which of the following can be operated at higher frequencies ? -SCR -MOSFET -IGBT

4 Answers  

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How the annunciator works ? How to do its wiring

0 Answers   Ford, MSEB,

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what will be happened when a single phase motor is supplied by the dc supply

3 Answers  

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how to calculate full load current of transformer & induction moter ?

2 Answers  

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WHAT DO YOU MEAN THE DIFFERENT TYPE OF CURVES OF RELAY LIKE STANDARD INVERSE, VARY INVERSE, NORMAL INVERSE, LONG INVERSE ETC....

0 Answers  

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