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Electrical Engineering Interview Questions

why capacitor bank always connected in delta,why not in star to a system?

NHPC, NTPC,

68297

Why current shoots up in the secondary on the knee point voltage during saturation test of CT? How core saturation effects the secondary current (while the primary side is open)? What the logic behind this?

1141

what are the preventive maintanance actions taken for air circuit breaker? please answer me

1135

dear friends, we are use 130 hp load run with 0.98 power factor ( 38KVAR capacitor connected ). if we need improve the the power factor to 1 (unity). how much kvar capacitor to be add. have any formula? please share with me.

3770

dear friends, how to calculate "Gage" in copper wire , aluminum wire etc. have any formula?

2378

What should be the percentage increase in length of the dead end clamp for bus bar conductor (Hawthorn) after hydraulic pressing and what should be the applied pressure?

1036

what happen when generator neutral supply and transformer neutral supply linked

4294

Why high Voltages come in multiple of 11, like 11 KV, 33KV, 66 KV, 132 KV etc.

17928

In Designing the rating & accessories of a MCCB how to choose the type of releases..means what is the basis for selecting, thermal magnetic, electromagnetic & microprocessr based releases

1243

What is Isolation Current transformer and what purpose to use it in REF relay ?

2775

The ratio of white balls and black balls is 1:2. If 9 gray balls is added it becomes 2:4:3. Then what is number of black balls ?

CTS,

6177

instead of neutral can we use earth/ground to flow the current in the circuit

4909

1. alternator has full load regulation of 4% when pf of the load is 0.8 lag, 1500 rpm. full load regulation of 1400 rpm for 0.8lag will be ________ ?? 2. torque angle of a sync m/c operating from a constt voltage bus is usually defined as space angle between _______ . 3. method most effective in finding out no load losses in large DC shunt motoris ______ . 4. current carrying capacity of fuse material depends on ______ . 5. coil has res. 10 ohm, inductance 1H. what wil be current after 0.1sec after switching on to a 500V DC SUPPL ? ? 6. effect of phase lag compensation on servo systems ___________ . 7. rotor of a dc machine is usually supported upon ______ . 8. DC motor is preferred to AC motor in which application ?? 9. 3 nos of 10:1 Xmer are connected in Star-Delta to supply a load at 230V.the supply voltage must be ______ . 10. voltage source produces max current in which circuit. 11. cal. power, if current and voltage are out of phase by 90 degree. 12. suitable length of Xmission line of power at 66 KV. 13. Which of the theorm helps in simple computation when the load across a ckt is varying ?? 14. what is the adopted line length for power Xmission of power by cables ??

TATA,

5193

what is the formula for calculating of dielectric strength of transformer oil.

Bhel,

9369

What is difference between A.C & D.C Resistance ?

5397

Un-Answered Questions { Electrical Engineering }

what are the components in electrical control panel (for example: 415V, 3-ph, panel to operate utility and 3-ph DG set).

1140

what is RFID? thire application;

1143

substation+ plc system

1120

What is the end effect of linear induction motor ??

1162

what is acceptable leakage current for 33kv cable while doing high voltage test for cable? how to calaulate the leakage current for 33kv or any rated cable?

2472

I WANT TO know WHICH WAY IS BETTER FOR CONNECTION BETWEEN POWER TRANSFORMER AND MAIN DISTRIBUTION PANEL. 1-IS BETTER WE USE CABLE? 2-IS BETTER WE USE BUS DUCT? my transformer rate power is 2500KVA

1982

How to Preparation of online test

653

defult setting in p220 micom motor proction relay for 11kv,640kw,f.l.a.-40a,1440rpm ht motor?

2730

I Have 3 Phase 10 KW AC Alternator i found one phase weak, so what will be the reason & what action shouls i take to rectify the same.

1157

how can we phase identification in a distribution line,how we recognise that which phase is coming for a house hold connection.help me............

1154

how hydrogen cooled alternator undergo maintanence ? that is hydrogen when come in contact with air can result into explosions .

1121

How much kv gas generator is needed to run 2 hp and 1 hp airconditioners, plus a refrigerator and 4 Tvs

3754

what is the purpose of shading ring or shading coil in electrical equipments.

3428

How to Decide(calculate) Bush bar size for copper and aluminiam ?

1292

what is the difference between Central Battery System and UPS in applications and uses? and why UPS suitable for Computers and central battery for emergency lighting?

8997