Answer / mohamed mustafa

Mechanical strength of CU is more than ALU
cu has more corrosion resistance than alu
resistivity of cu is less than ALu so a good conductor current

Answer / vinod

---> Copper (Cu) was a good CONDUCTOR (good conductivity) than
Aluminium (Al).
---> Al is cheaper than cu
---> Earthing was done because of excess of electrons passes
through the Equipment/Device hence the device was damaged. So
Earthing prevents equipments from (excess of
electronics)damage.

Explain with example of functional requirements of protection relay in terms reliability, selectivity, sensitivity

0 Answers   NCC,

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i am going to give the JSEB,RANCHI exam for power plant,so i need some samples of papers related to that,so please send me these papers by my mail id.

0 Answers  

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in ACB breaker requireding 3200Amps. buscoupler getting OFF mode and again it reset and getting normal position give me a required answer?

0 Answers  

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can transformer work on dc or not?if we increase the inductance of transformer can it happen to work on dc?

1 Answers  

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There are two nos of 33Kv/11Kv 5MVA transformers conecting through HT cable from substation having metering at substation itself.One transformer used at a time another remains stand by.Further 11 nos of 11Kv/440V transformers are attached on it and each transformer is having its own Power factor correction panel.Now one 33/11Kv transformer at no load condition/Stand by condition is having power factor in leading side upto 0.21 and while when another tranformer at same situation have power factor in lagging 0.42. Now one thing is clear that transformer one is having 1.5 Km long 33kv cable due to that PF goes in leading side and another is having only 250 mtr length remains him lagging. Now i want to know that how i can maintain the Power factor at no load/ stand by position though both are behaving in seperate manner.

1 Answers  

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I am an electrical power engineer and arranged power system for a data center, I installed MCB, ELCB and erthing system TN-C-S. But some times several ELCBs Disconnect circuits at the same time! what may be the reason? (the ELCBs are 25A ,30mA)

9 Answers  

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what is power factor?

3 Answers  

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What are high pass filter and low pass filter? and What are the flowmeter ?

0 Answers  

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A jet of fluid strikes a plate What was the force required to counter it?

0 Answers  

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-How do you select cable size for a given load at a given distance from source of supply. How do you find voltage drop.

0 Answers  

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what is ignition?

1 Answers  

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HOW TO CALCULATE HV CABLE SIZING?

0 Answers   KNPC, L&T,

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