Answer / venkat

basically there are 3 types of relays 1)electromagnetic
relays 2)electro static relays 3)microprocessor based
relays. and the name to realys came from
application ,ex.over current ,under frequency,etc ......
so basic classification is just like first line

Answer / thowsif_emerson

Types of relay
1 Latching relay
2 Reed relay
3 Mercury-wetted relay
4 Polarized relay
5 Machine tool relay
6 Contactor relay
7 Solid-state relay
8 Solid state contactor relay
9 Buchholz relay
10 Forced-guided contacts relay
11 Overload protection relay

Answer / kumar

mr thowsif .i already get the above answer in
wikipedia .but i think this is not proper answer thats y i
submitted this question any other answer please
forword ,thank u

how motor should be connected i.e star-delta or star-star or delta-delta ?

3 Answers   GSE,

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We have a 12MW power plant & we inject 5-6MW power to Orissa GRID. For this we have a 33KV/11KV switch yard having 12.5MVA power transformer. Some times we draw power during emergency. It is observed that during Export or Import for load less than 500Kw the power factor is decreasing to 0.3 . This is happening only during export or import. During island condition TG power factor OK.Our capacitor bank is provided with our Power plant auxilliary load. Please suggest how I can we improve our power factor during low load (GRID).

3 Answers  

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which plant has high load factor

10 Answers   APTransco,

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what is dol starter

1 Answers  

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why do we use LPF wattmeter not UPF in the experiment of no load and blocked rotor test of 3phase slipring induction motor?

3 Answers   Matrix,

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In a 3 phase,400v,4 wire system, 2 incandescent lamps, one having 230v,100w and the other 230v,200w are connected between r phase- neutral and y phase-neutral respectively. If neutral wire breaks which lamp will fuse first and why?

3 Answers   Eskom, SSC,

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why rotor winding in induction motor is not earthed. normally we uses star winding in rotor .why?

3 Answers   Anglo Platinum, TATA,

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i have applied for junior engineer 2 c&w for Guwahati RRB please send me last five year question paper

0 Answers  

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please describe the Transformer setting, Motor setting, I/C setting, Tie setting

0 Answers  

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why we use primary delta connectin in hight voltage transformer

2 Answers  

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How to calcluate the current by means wires/cables in square mm

2 Answers  

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Why generating voltage is limited up to 22kV?

4 Answers  

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