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Electrical Engineering Interview Questions

wwht is wave trap used in ht line

4245

why use celling fan wing is two or three ?

3333

How can we calculate the KVA rating of a Distribution transformer from its core details?

ABB,

1179

How to calculate no of Lighning arrestors are required for protecting 50mX 50m*20m cubical building and locations of LA?

HAL,

1093

What is the min.& max distance between two earth spikes is required for measuring earth resistance of an earth pit? Is the manufacturer of Earth tester decides this? Pls explain.

ABB, HAL,

7097

We use ungrounded DC system (220V/110V) for control and protection system in substations etc. Suppose we have long 2 core DC cables running from our DCDB in control room to the load (length of around 2 to 3 km). Do we need to protect these long DC cables from earth leakages or not? If yes how?

8730

explain in detail HV & LV bushing connection in power transformer (110 / 11 kv 16 MVA)

15230

How can I model an open-delta ground transformer for a network supplied by 4 unit GTG and power transformer in ETAP?

12848

When should I use earth leakage circuit breaker for incomer and when should I use it for each feeder seperately?

2240

How can I communicate with an Areva MiCOM P121 relay by RS485 port? In other word, which command can I send and what information can I have recieved? please send some refrences, please. thanks

8184

the distance from my office to d.g is aprox 400mtrs and voltage drops ibn my office near about 40 volt what should i do p[ls suggest.

4042

1.what is the funtion of chiller primary & scondary pumps. 2.what is the use of distribution lines & Types. 3.what is the use the thermal power stations & how much capacity.

1145

Can we operate a DG Set in paralell with Transformer ?

8782

what is the Connected Load (kW) or Contract Demand (kVA)of mahindra nasik plant??

8344

in flemings lefthand rule thumb indicate for....

3496

Un-Answered Questions { Electrical Engineering }

What is q factor?

262

if 2 coil of 1000W connect in series and 200 v is applied across it . then what is the total power of coil when coil have only resistive load .

1136

Calculate torque developed by the 3-phase, 5 H.P., 4 pole induction motor runs at 1500 rpm A 23 N-m B 21 N-m C 10 N-m D 0 N-m

2454

Why do we need interlocking in a HT metering or Ring main unit switchgear?

1141

1.WHAT IS A SMART CAPABLE DB ( DISTRIBUTION BOX) ? 2. HOW TO DECIDE THE TYPE OF DB TO BE USED ( RECESSED/ PLUG TYPE/ SMART ETC ETC? 3. WHAT IS MILLENEUM BUS BAR USED IN DB? 4.DIFFERENTIATE MCCB AND MCB.

1008

How would you relate your key competencies to this position?

1295

what is difference between elr and R eartl realy.

1409

66kv under ground cable how to layaing in ground any special case two ckt r runing

1078

what is the advantage of connecting capacitors in delta than in star?

1231

Define settling time.

244

6130

what is earth-fault?when it occurs? to check where it occurs what type of test should we do?

1220

for hipot test on 33kV busbar, we will test on 70 kV or 56kV, what is the acceptable leackage current?

84

we need a ntpc previous papers

1064

could you measure current in parallel?

262