Electrical Engineering Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

Is it alright to connect more than one RCCB of same rating in series for a three phase equipment?

3 4999

why substation ratings are multiple of 11 means 11\33 kv substation

6 20008

why full load voltage is less than no load voltage?

4 6773

why compound generator is used in generating station?

2 4839

what are the needs of electrical earthing.... other than protection?

Eskom,

5 9678

what is the current generated in a 230v megger?

2 5320

a 11 kv line is grounded and a 110 kv line is grounded. which line have the greater current flow?

4 7388

in india why 50 hz and 220 volt taken as standard rating for equipments whereas in US 100hz and 110v is consided as standard rating.is this method save power.

Wipro,

5 10018

when power transformer is flashed which gas is produce in side?

5 8696

why zero sequence impedance measurement is not applicable for single phase GT

2199

What is creepage distance..... what will be the value for different voltage level

1979

how to improve power factor correction?

3 5923

how to flameproof electrical motor on the shaft?

2058

there are a transformer and a motor. both are connected to 3phase, 415 Volt, 50Hz power supply. Both are working with induction principles. Then, why, motor is rotating and transformer is not rotating.

8 12127

mention the earthing system as per BIS?

1 5059

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Un-Answered Questions { Electrical Engineering }

for 100 HP Induction motor service factor is 1.2(SF) we placed a VFD at the motor side load is balance with 0.3 Amp's Phase to Phase but at incoming of VFD load is un-balance with 10 to 20 Amp's what will be cause of load un balance

1945

WE HAVE THE DC RECTIFIER 1500A, INPUT VOLTAGE IS 3 PHASE. HOW TO CALICULATE THE LOAD? 3 PHASE SIDE EITHER dC SIDE. PLEASE SUGGEST ME

1875

Can the output voltage of a rectifier be greater than the input AC voltage without the use of any voltage multiplier in the circuit??please provide the explanation too..

2114

Difference between earthing & grounding.?

2164

What do you mean by a voltage transformer?

1151

WE ARE PLACE A NEW 75 KW MOTOR FOR JPF.IT IS CONNECTED IN M.C.C. WHEN WE ARE STARTING M.C.C.INCOMER IS TRIPPED.THEN WE ARE CONNECTED IN P.C.C WITH A MM30 RELAY PROTECTION THEN WE ARE STARTED MOTOR WILL RUN SMOOTHLY.

2071

what will happens if one phase is missing for 33/11kv power transfomer and why?

2653

explain with diagram how to protect transformers and substations from over current with help of CT's?

1954

which protection function should measure RMS value of current&DFT value of current?

2084

How each of the following losses occur in d.c machines (i) copper (2)core (3) windage (4)friction please help me

2036

Metal covered multiconductor cables shall employ a marker tape located within the cable running for its complete length in lieu of cable surface marking. Is it true or false?

2266

In Air circuit breaker LSIG protection unit is used. Without fault in cables (2 runs 3Cx150Sq.mm Copper, 1Kv grade, XPLE armored cable IR value is more than 550Mohm @ 500V Megger) and load section Long time Overcurrent protection is triggers and trips the unit. We changed LSIG protection with new factory tested unit. Even then fault is persisting. Please suggest the possible causes

808

what the Microsoft .NET framework is?

2002

Phase control and integral control are used for?

2330

what is meant by k-rating in isolation transformer?what is k9, k14 stands for?

2776

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