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

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

What is center gravity load in substation?

2377

why transformer neutral and CT Secondary neutral is connected to earth?

NCC,

3 4553

What is the main difference between generator and alternator

4 4958

How to calculate current carrying capacity of copper conductor _ such as cable size 25sq mm,50 sq mm, 75 sq mm, 100 sq mm

2 4405

What is the difference between diesel generator engine with and without turbo charger with the same capacity?

1639

what is PDU in transformer?? which company manufacture??

1844

a 440v 60hz 03 phase 100kw generator can deliver how much power in kw for 220v 60hz 01 phase load?

1 2288

can we use the 110 v primary Tr 240 v secondary step up Transformer as reverse 240 pri 110 sec

Hyundai,

3 4186

Sir, My doubt on cable sizing calculation, Load:74 KW calculated cable 1 run 50mm2. Now client asking us to reduce cable size by increasing runs. Sir, My question now when my mind strikes with 2 options 1) Divide load 74/2 = 36 and calculate cable for 36+36 making it 2 runs or 2) Simply i can divide 50mm2 /2 ie. 2 runs of 25mm2 Please suggest me sir

1869

how ups works ? various parts of ups and working principle

Serco,

1927

Explain Power factor in simple words

ETO,

1 4096

Describe Non I.S. Earth System and why is it used?

KPJV,

1745

Why lose 1 phase voltage in 33kv to 415v stepdown transformer

1702

why wire sizes are 3/29 or 7/29 and why not wire sizes are 2/29 or 6/29?

OGDCL,

5088

why generation voltages are 6.6kv or 11kv and why not some one give that stander that generation voltages are 5kv or 12kv?

AES,

1 4004

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Un-Answered Questions { Electrical Engineering }

Is it posible to instal one more SMDB from the existing SMDB and is it practical.

2051

Explain the process of commutation in a dc machine.

1001

What is power relay?

1200

why does rotor rotets?

2577

Define delay time.

1047

i want to run 11kv star connected motor in 6.6kv with delta connected throught inverter, is it possible?

1989

HOW DO YOU CAN CHECK A 15KV DIODE, WHETHER IT IS OK OR NOT?

1993

WHAT IS THE CURRENT CARRYING CAPACITY OF 2.5/3 CORE HI TUFF CABLE,WILL IT SAFLEY CARRY 8.6 AMPS OVER 120 METRES,CAN YOU ALSO ANSWER WITH FORMULA FOR WORKINGS OUT ,THANK YOU 3RDYR APPRENTICE.

3523

types of central Air conditioner plant?

2106

Suppose a 3 phase, 2 pole, 440V induction motor is driving a flywheel of 600mm diameter, 150kg mass. By using v-belt and pulley, the speed is increased to 4500 RPM. What will be the effect on motor current?

1350

plese send me the oces/dgfs sylabus and previous year question pattern of electrical engg.?

2273

how to calculate the surge level of surge suppressors related to the SF6 cicuit breakers?

1939

Difference between shunt, PMG and AREP excitation. Which is the most reliable between PMG and AREP.

9534

Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.

2130

What is diversity factor in electric installations?

1131

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