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 7178

how to reduce earth to neutral voltage?

Field Gun Factory,

8 17168

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

1 1559




Any one can explaination about calibration with rotating sub standards?

698

What is the basic working principle of Tri vector meter?

TCS,

5 24002

What is the difference between double compression

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

7 50027

how current flows in circuit?

11 9797

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

6 23546




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

6 13682

what type of earthing is done on hilly rocks.

4 10946

what is the difference between Earthing,Grounding and neutral?

Biocon, Tata Steel Limited,

3 3845

What is the output voltage of a DG set.

Fitness First,

3 5318

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

Grasim,

1055

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

969

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

FlexPoint,

5 8756


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Un-Answered Questions { Electrical Engineering }

how can i use REF and diffrencial relay both in 1 CT core for transformer protection?

528


For a 6.6kV Motor it is recommended to do megger test with 500 V d.c and not more than 5kV d.c but the Hi voltage withstand test should be performed by 12kV AC. Why the dc voltage test should be limited but AC voltage withstand test could be with such a high voltage?

749


What is the effect on in Zone and out zone fault if Phase side CT is Vk/2<30 mA and Neutral side is CT is Vk/4<30 mA for Transformer REF protection

1519


how many safety really of DG sets.

877


Difference between RCCB, RCBO and ELMCB.

1922






What happen to the transformer if the OLTC frequently used for lower and raise occured 50times daily?

744


bus bar design conditions and sizing pls tell me quickly

671


what are the advantages and disadvantages of speed control of 3 phase induction motor by varying frequency explain with drawing

1099


how to identify vector group of three phase transformer by voltage method?

392


why h parameter are called as hybrid parameter?

692


CALCULATE THE TOTAL VOLTAGE DROP AND SELECT THE CABLE SIZE IN MM-SQARE FOR A PANEL-262KW AT 110 METER FROM THE SOURCE SUPPLY , SUPPLY VOLTAGE 240/415

1382


How can we select suitable capacity generator for three phase load (inductive load) and how to take study analysis in 3 three phase load system ?

797


Why Transformer Neutral having one earth pit ( more earth electrode resistance) whereas body have many earth pit ( less earth electrode resistance)?

2995


What work have you done on full chip Clock and Power distribution? What process technology and budgets were used?

1385


how you configure motorvision relay (L&T make)from DCS

2618