Electrical Engineering Interview Questions
Questions Answers Views Company eMail

In a 3 phase 4-wire system. For a 3.5 core cable if all loads are single phase and balanced, what will be neutral current? will it be sum of all phase currents? Or it will be zero? And if loads are unbalanced what will be neutral current?

1242

explain the functions of main isolation switches

Zesa,

1185

please I wont know how to calculate the vector group for power transformer ZNyn11 best regard.

Al Rasikh,

1261

The synchronous machine excitation system explain

1318

Any formula to calculate neutral current in 3 phase 4 wire system

1 2132

What are IP protections used for electrical panels, JB, equipments installed in explosive zones like Petrochemicals, Oil & gas

1209

In my 3 phase 4 wire electrical system N to earth voltage is 0.08 is it ok What is standard for it ?

Kay Bee,

1 1575

What are the difference between normal application Transformer and Solar application Transformer?

1223

how to handle 2500 kva transformar

1128

why are transformer rating in MVA

Suzlon,

2 2820

a starter used for squirrel cage induction motor?

1204

Instrument connected to a single phase supply

Alstom,

1237

What is the safe limit of voltage between earth and neutral in india.

Incepta Pharmaceuticals,

2 2828

Power systems

LB Engineering,

1275

What is the possible cause for failure of lightning arrestors in outdoor substation under normal condition

1247


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Un-Answered Questions { Electrical Engineering }

how we can find of current direction(supply comming/out going direction) when a transmission line passing through sides.

1894


is IS says that neutral should be brought to switch box. and this one is a recomended practice

1420


how to measure dc earth leakage current?

2586


Why does curving the pole faces in a dc machine contributes to a smoother dc output voltage from it?

752


what happens to the water pump if ground water level is slowly decreasing?our water pump is varying from no-load full-load due to this problem

1200






How harmonic block test are conducted on relays ( Siemens,Areva ect )power transformer using omicron kit?

1743


how does it help for selection of a transformer.

1352


what's the exact magnitude of current, flows through Neutral?

1532


What is q factor?

660


any application of back emf

1611


what are the accessories need to be added while doing estimation for the following: 1.MCCB 2.MCB 3.ACB

1567


in a silicon diode we can measure .7v in a voltmeter.but why we can't use this voltage for using?

1451


how the synchronizing is obtained at bus couplers in grid substation? (because there we cannot change the frequency in one of transmission lines like in generator synchronization)

1846


Please tell me the formulaes while designing a substation for power Calculations in designing a 33 KV Substation?????

1365


What is the minimum distance to be maintained in between HT panel and LT panel and Instrument panel as per IEC and NEC standards?

1228