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Electrical Engineering Interview Questions

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

NHPC, NTPC,

71748

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?

1364

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

1383

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.

4290

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

2711

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?

1247

what happen when generator neutral supply and transformer neutral supply linked

4804

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

19357

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

1463

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

3133

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,

6979

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

5440

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,

6203

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

Bhel,

9860

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

5977

Un-Answered Questions { Electrical Engineering }

A ray hit a smooth regular surface at an angle of 20 from the normal. Calculate : 1. The angle btw the incident and reflection ray. 2. The angle of deviation.

1300

Why does the radius of armature is less than the radius of pole shoe?

1500

What is the classification of hydro projects based on installed capacity?

474

by what factor the starting current is used when comparing star and delta connection for motor starting?

1387

Electronic circuit

408

Give the topology of current amplifier with current shunt feedback?

514

100 MVA 3-phase alternator with earthed neutral has a reactance of 5 ohms per phase. what will be the fault MVA of generator.

1606

what is lrs tank water resistance.

1901

what is the difference between skin effect

1555

How seriving & testing of the HT & LT breakers are done. What are the standard Ir values on which we can come to know the test is passed or failed?

1263

State thevenintheorem?

442

what kinds of Transformer oil grade is better for power transformer ?

1001

Is there any rule to select the voltage of motor based on KW rating? What is the rating above which lt motor becomes the HT motor?.

1073

what is a speed of rotor when we give supply to stator of 50hz and as well as rotor of 60hz of an induction motor?????

1066

What is difference between mcb and mccb.

487