Electrical Engineering Interview Questions
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WE are using a 63A MCCB(SIEMENS MAKE) for one of the feeder in LV substation panel.It is supplying to a lighting & power socket DB.Settings in the MCCB is Ir = 63 * 1 , Isd = 8 times of Ir , tsd = 0.5 sec( I2 t off). Sometimes this MCCB is tripping .But no trip in DB MCB. Can anybody tell me reason ? From where i can know about the MCCB settings?

5 7092

how to reduce earth to neutral voltage?

Field Gun Factory,

8 16622

what is the differnce of STATIC ENERGY METER FROM ordinary energy meter?

1 1510

Any one can explaination about calibration with rotating sub standards?


What is the basic working principle of Tri vector meter?


5 23297

What is the difference between double compression

Bhel, PDO, Orchid Chemicals and Pharmaceuticals, Prefamac, Hyundai,

7 49061

how current flows in circuit?

11 9612

What is the current flow in 230v ac supply ? What is the current flow in 415v Ac supply ?

6 23050

why the power factor in inductive load is lagging while it is leading in capacitive load?

6 13445

what type of earthing is done on hilly rocks.

3 10626

what is the difference between Earthing,Grounding and neutral?

Biocon, Tata Steel Limited,

3 3740

What is the output voltage of a DG set.

Fitness First,

3 5174

Why PT voltages are measured with respect to ground? What do u mean by voltage or current polarized.



I am inpecting a 10kVA UPS what tests should i do and should i observe?


what do you mean by synchronous speed of a three phase induction motor?


5 8563

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Un-Answered Questions { Electrical Engineering }

any body,pls tell me how to done relay coordination ? how to coordinate by TCC curve?how to read the tcc curve?


what is the difference between STAR and DELTA connection and application wise how it can be utilizedd


What is mean by spike arrester(Voltage Operated)


How can we choose the rating of submersible motors


why you don not show protection and type of isolation in key single line diagram?


What is the meaning of Insulation H for transformers????


which one is more efficient, torq, power & ecnomy with the same frame size AC motor / DC motor?


what is the necessity of under ground cables ??


what maximum range of star & delta in hp or kw ?


A 50Hz,4-pole,3-phase,star-connected synchronous motor has a synchronous reactance of 12ohmsper phase and negligible armature resistances.the excitation is such as to give an open-circuit voltage of 13.2kilovolt.the motor is connected to 115kilovolt, 50hertz supplying. what maximum load can be the motor torque,line current and power factor?


what is draiv work


1.What is captive power plant? 2.What is national grid?Give brief idea.


What are the causes of having an rmu explode after installation? And how do u treat the bushings of an rmu?


Difference between RCCB, RCBO and ELMCB.


Whats the minimum value for I.R. that can be allowed for HT & LT alternators for operation?