how is the testing of an REF relay? what are the test REF circuit having?

2002

Hi, Next week Iam appearing RRB exam for section engineer. So help me to get modal question papers for this position. Iam very thankful to you. Whether question will be fully techanical format or general form. Please give me a details regarding this exam.

1912

How process line mpm calculation is done?

1415

we have a s-5 simense plc having op7 .recently on op7 showing error 1.plc not present 2. DB error frequently. can u have any solution . please send me.

2609

How to calculate the copper in HT motors if KW, RPM & Voltage is given

3208

What is the difference between a multiplexer and encoder?

1078

why is a power transformer used only occasionally?it is used to step up at generating stations?and that needs to be done all day long !!!!!!!

1871

Explain the advantages of using a ball mill over other conventional methods of crushing?

1051

What are some good tank mixing rules of thumb?

1079

Help need in transformer !? Hello Friends The parameters of 2300/230 v 50hz t/f is R1=0.286 ohm R`2=0.319 ohm Rc=240 ohm X1=0.73 ohm X`2=0.73 ohm Xm=49.2 ohm Secondary Load impedance ZL=0.387+J0.29 solve the exact equivalent circuit with normal voltage across primery.. I know every thing but i cant find CURRENT I1=? and I`2=? Please help me give solution or only Formula please please...

3109

How can I calculate ISF of current transformer?

3639

why and where we use early make & late break contacts in protection?

8321

What are the different types of power mosfet?

1084

why all the feeders are designed in a particular manner ... is there any reason for that???

1957

How to calculate MCB Breaking capacity.

1521