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Electrical Engineering Interview Questions

How to select, design,size & calculate for 11 KV/33KV/66KV/132KV/220 KV/440 KV circuit breaker for HT side of transformer protection/HT distribution protection?

1758

11kv = LT 440v , how many amp.supose 440v side 5000 amp curent drown

3920

what is difference between electrical and electronics

2917

in control scheme dc logic wiring commonly using negative loop,what is the reason?if we use positive looping what will happen?

1388

what are the difference between AC lamp and DC lamp

1266

Please give me a solid reason there are 2 ELCB's If we take Phase from ELCB NO:1 an Netural from ELCB N:2 why ELCB is tripping when we connect the Load?please brief me with detail

2665

Can any body describe me why a soft starter is used for 6.6kv induction motor instead of VFD ?

2615

What are various modes for Mechanical interlocking of breakers (for both MCCBs & ACBs)

2391

Hi.. I am a BE GRaduate in E&E. I have 8.5 Experience in Tendering & Estimation field. I have done SAP SD course few years back. But due to some reason i failed to get job in that field and continued my own field. Now I am thinking of changing into SAP seriously. How should i go ahead???

1033

If OLTC is in manual position there is chance to variation of voltage(Low or High)?

1358

in non technical way how can u define POWER FACTOR??

956

what is the control circuit for operating the clean room air shower

L&T,

1236

draw a dol with the following rtds,stop/start,ct,vt and o/l supply is 6.6kv and the coil is 110v

2777

what is difference between earth and ground?/

3901

11KV AND 22KV NETWORK KW CAPACITY IN RING AND RADIAL?

1171

Un-Answered Questions { Electrical Engineering }

What should be the length of transmission line so that we can see/obtain the full sine wave of voltage??

987

what happen when we add mentos in cold drink?& why?

1099

what is the disadvantages of common earthing for AC and DC equipment? (i am talking about inverter control room and inverter duty transformer earthing is common...?)

731

11kV capacitor bank of rating 2.4KVAR, is charged with protective relays of only over current & Earth fault &.......without Over Voltage, Under Voltage & Neutral Displacement Relay. Is it advisable??

776

What is method of calculating the fault current for a MDB, 50KW, 3PH, 415V, 50HZ?

1253

if flux and load static in dc motor and supply voltage increases 20% then what happened in speed

974

Can u explain : what is supply for train (whether a,c or d.c ).I know that supply is 25000v a.c .But there is rumour that supply is D.C. And also explain how lights and fans inside the trains are working ,and what type of motors are used in trains whether D.C motors or induction motors .If d.c motor, how it gets supply.If traction motors are used then what are traction motors and its functions and how it differs from other motors and also explain about locomotive . y d.c series motor in train.train wheels r driven by D.C shunt motor ,at what voltage,and at what speed. please reply..............

973

When distance between two pulleys is not fixed, the tension of belt is adjusted by a) driver shaft b) driven shaft c) adjustment screw d) belt

1081

Is it required to lay 2 runs of GI wires along with armoured cables from one power DB to another Power DB?

1015

Why 15Amp. MCB is suitable to carry load of 1.5Ton Ac please Explain?

1240

can we use NPT glands in LT panel

858

how to failure indution motor insulation & how to improve heat in motor insulation

957

Is there any standard guidelines/Criteria to design NGR/NGT.?

1929

why we need to us lenz's law for synchornous motor

1498

What is the difference between UPS & inverter ? which UPS is better and whos got the edge ? what is the difference between & inverter ? which UPS is better and whos got the edge 12 V , 24 V , 36 V etc what are the advantages of 12 V, 24 V , 36 V etc and what are the disadvantages of 12 V, 24 V, 36 V etc thanks

1082