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Auxiliary relay used for standby protection of electrical circuit when main relay fails to operate.
PLA relay used for feedback purpose.its work like a NO NC .

what is voltage rise and voltage drop?

8 Answers   HP, jetking, TCS,

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What is the Diference between DYN 11 and DYN 5 .How to change the Vector group from DYN 11 to DYN 5.

3 Answers  

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There are 2 motors without name plate and terminal but one is DC motor and another is induction motor.How one can identify which one is DC and which one is AC motor?

6 Answers  

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why do we require two lines one phase and a neutral for an ac transmission..is neutral potential zero..?if yes y carry a neutral line from generating station itself...why dont we take it from ground

1 Answers  

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If u have Powergrid model question papers Please send to below mail ID rajutheprince@gmail.com

0 Answers  

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minimu size and length of gi earth pipe

2 Answers  

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what is star delta starter? how it works? give its control and power diagram.

0 Answers   Bhel, Point to Point Solution, Star Wire,

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what is the difference between ac motor and dc generator

0 Answers   ETA,

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why sometime we get electrical shock while touching the ballon of dish tv connection ? which we should not get.

0 Answers  

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what is the difference between self excited & seperately excited ?

3 Answers  

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Why should we use Star-Delta connection in step down power transformers?

7 Answers   L&T,

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-----------means a source which can supply a constant voltage to aload irrespective of the valu of load resistance.

2 Answers  

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