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.

what is split phase ac system?

3 Answers   AMIE,

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why do we measure VIBRATION in -24vdc and why we adjust gap voltage -9vdc to 10-vdc? i am trying to get this information since 5 years, yet i haven't get reliable answer, i hope i can get from you.

0 Answers  

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What is converter transformer? Diff b/w converter transformer and distribution transformer? why we use converter transformer in place of giving supply to drives?

1 Answers  

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What is the purpose of stand by earth fault protection for transformer ?

0 Answers  

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why the Parameters : Base Voltage & Maximum Voltage can't be equal in value in a VFD (Variable Frequency Drive) ? How much the base voltage would be lower than the maximum voltage ? If 400 V is the 3 phase output of a VFD ... then what should be the base voltage ? thanks a lot

1 Answers   Yaskawa,

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what happen if generator exitation lost?

7 Answers  

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What are the questions asked in PRDC pool campus test?(bangalore)

1 Answers   PRDC,

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why are we maintaining some specific gravity in battery ?

5 Answers  

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What is the difference between AC and DC injection methods for rotor earth fault protection

0 Answers   Asian Alliance Insurance, NBVL,

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why plc need seprate earthing?

2 Answers   ABB, Whirlpool,

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why we use negative feedback in control system.

2 Answers  

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why do we have spikes enough to burn electronic boards, when generators are not grounded

0 Answers  

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