Electrical Engineering Interview Questions
Questions Answers Views Company eMail

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 7238

how to reduce earth to neutral voltage?

Field Gun Factory,

8 17551

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

1 1614




Any one can explaination about calibration with rotating sub standards?

745

What is the basic working principle of Tri vector meter?

TCS,

5 24670

What is the difference between double compression

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

7 50514

how current flows in circuit?

11 9934

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

6 23949




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

6 13884

what type of earthing is done on hilly rocks.

4 11213

what is the difference between Earthing,Grounding and neutral?

Biocon, Tata Steel Limited,

3 3935

What is the output voltage of a DG set.

Fitness First,

3 5467

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

Grasim,

1090

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

991

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

FlexPoint,

5 8894


Post New Electrical Engineering Questions






Un-Answered Questions { Electrical Engineering }

Dear sir, In our plant have Station Transformer having capacity,i want to know, why LV side 40 - 40MVA is given? & how we can get 6.3 KV supply from tertiary(i.e. Open delta connection), Vector Group YNyn0 - yn0 +d MVA Rating 80MVA / 40 - 40MVA + 26.7MVA Voltage rating 420 (Tap range +6,to -10)81.25% /11.5KV - 11.5KV +6.3KV

901


how do i commission a distribution transformer knowing all its ratings and transformation ratios?d

2801


WHY IS THE EARTH FAULT CURRENT ALWAYS LESS THAN THE NORMAL CURRENT??

956


why d.c produces corrosion

790


In cable sizing calculation (determining the max route length of cable) why we choose the shortest length between cable length of full load current Iflc & starting current Istart?

1958






why single CT used in DOL starter power circuit?

1126


Why in power plant projects we see DOL starting method used for motors upto 160 kW instead of star delta method

631


what will happen if ac and dc supplies given

890


I want single line diagram for AMF & DG syncronizing panel

5187


Where voltage are high and current to be interrupted is low the breaker preferred is:

856


how to handle 2500 kva transformar

386


what is the transformer turn ratio formula and give some examples?

1254


how to calculate the magnetizing current of ct ( 800A/1A) for Relay 64

286


What is the difference between Droop vs Isoch Control?

1014


Dear all i want to know FEWA Electrical Supervisor Licence test Previous Year Questions ? If any body know please send to me shibin_75@yahoo.com

8193