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

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

ELCP USE IN 3 PHASE SUBMERSIBLE PUMP? THEN USE 3 POLE 0R 4 POLE?

4 7566

what is the difference between surge protection capacitor and surge arrestor

NCS, NCS Sugars,

2268

What is the diffrence between ofline ups and online ups?

Intel,

3 6975

What is the purpose of RECTIFIER ASSEMBLY in AC power generators?

2 7032

Why we cant store an ac power. If we coo store in which device we can?

Jindal,

2134

I am looking for LV CT test. To check the polarity of the CT only. Can you suggest any supplier. Different companies are offering CT/PT Tester which is expensive. Thanks

2 5131

WHAT DO YOU MEAN THE DIFFERENT TYPE OF CURVES OF RELAY LIKE STANDARD INVERSE, VARY INVERSE, NORMAL INVERSE, LONG INVERSE ETC....

1921

difference between a diode and thyristor?

2171

What is the difference between single core 2 wire and single core 3 wire system? Which application we are using this? and for What purpose we are using this?

2308

1.what is meaning of curve into a mcb. 2.what is basic reason changing of curve

1962

What is load shedding?

1 4634

What do you mean by eddy current loss?

1 4503

What are the causes of eddy current losses?

Schneider,

1 4658

when i am going to take trail on a 3ph sq.i/m motor 5.5kw, i observed that RPM of the motor is very low as compared to the rated RPM and also it rotates in clockwise in first ON command,and anticlock wise in second ON command. finally i observed that on phase is no available . but iam not clear about, why the motor is rotates in both directions without any phase interchanging.pls answer to my question.

1 5223

Our Alternator nameplate specifies a power factor of 0.8. When the Alternator is on light load, the bus bar voltage rises to 11240 volts, whereas the standard value is 10500 volts. Is it ok to increase the power factor to 0.85 or 0.9. I am afraid because the power factor on the name plate is only 0.8 ?

Escube,

3 6513

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Un-Answered Questions { Electrical Engineering }

what is effect of length of air gap on performance of dc motor and generator?

1840

What is the two pole structure?

1879

Define what is difference between fuse and breaker?

1123

Define reserve-generating capacity?

1125

What is industrial plc

1741

WHAT IS SUBSTATION & ACCORDING TO VOLTAGE HT,EHT SUBSTATION EXPLAIN IT

3121

any idea abt REVERSE METERING concept.........?

2187

What is the basic principle of welding process?

2100

HOW WE KNOW IN PHYSICALLY THE CONTACT SURFACE OF A VACUUM INTERRUPTER IS GOOD OR GOING TO DAMAGE IN A VCB AFTER ABOVE 500 TIMES OPERATED.

2015

Define coil span?

1022

What is phase cross over frequency?

1076

What is the angle of inclination for the oil connection from transformer conservator to Bucholz relay and why?

2175

What are the types of power in electrical power?

1153

When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

2109

i will applied in 1U-1W on 440 volt primary delta side. what is the result of magtic balance test

1746

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