Answer / yusuf

> Opening and Closing Coil Resistance measurement
> Contact Resistance Measurement. (This Ensures minimum
Voltage drop)
> Timing Test(Ensures Fault clearance time)
> IR Measurement(Ensure proper Isolation from Ground and
between Phases)
Other than these, H.V, Flash Test, Tan Delta are also done
in the factory

Answer / manisand1

Above all some more test is to included i will clear this
in next time.

15hp motor wound by 0.9mm & 0.95mm magnet wire. at no load test it draw 4.2A current. Another motor with same condition draw 9.2A current. How can that occur? pls help

0 Answers  

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is there any current and voltage drop on liquid resistance starter water/soda tank ?

0 Answers  

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can u name the different types of motors used in different types of applications?

6 Answers   ABB, Bhel, SBQ,

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7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?

0 Answers  

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what is slip ring induction motor? How it works?

1 Answers  

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what is interlocing and what is the purpose of this?

4 Answers   L&T,

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Please help me regarding my one concern. - During earth pit testing we noticed that the Clean earth pit and dirty earth pit showing continuity (Resistance value - 5ohm) . I want to know that if both earth pit have separate location and there is not internal looping between PIT then why such continuity is showing on it . Because of this issue the field side all earthing point showing short. In PLC panel we are providing two types of earthing cable which is coming from separate earth pit (Clean and Dirty earth pit) because of earth PIT showing short our PLC is not complying spec . please help regarding this issues.

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I am applying for NTPC examination.Can we please provide previous paper to my mail prasad.chintala108340@gmail.com

0 Answers  

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one split ac how can told of this ac which Tr tell me us

0 Answers   Wipro,

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Can we use MCCB with Auxiliary Contact in place of Contactor in a AMF System.

1 Answers   C&S, Farnek,

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I Need standard operation procedure(SOP)for 500kva Oil type transformer oil filtration & Procedure for IR value checking.

0 Answers   Reliance,

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How much pf maintan in dg set in 6o% load,when Dg runnig Neutaal Earthing removed what happen.

0 Answers  

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