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

Electrical Engineering Interview Questions

Questions Answers Views Company eMail

WE know that for Inductor X=2pifL,In DC f=0,then X=0 so,V=IX=0;But In the DC excitation of rotor of AC generator,DC motor field coil which coils are inductor so why does not applying DC voltage short the rotor coil of AC generator and field coil of motor?If it would then DC source might be damaged but it is not happened. Why does the strand conductor of Electrical power transmission line make twist?

4386

What is the basic difference among IPS,UPS,EPS?

ABB, Navana,

2 18527

Earth leakage relay basic knowledge principle

Radiant,

2180

HOW to speed control of induction mototr using scalar control

3 6145

if one of the phase is failed to 3 phase IM. what will happen?

6 9208

how we calculate electrical load on a building according to area?

HFCL,

2794

why transformer are rated in kva.

Dalkia, Nalco,

5 8665

What are the necessary conditions for production of rotating magnetic field.

BARC,

4 10129

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

BARC,

4476

what is differnce between oil transformer & dry type transformer ???????????

2 6425

Generally the incandescent lamps in bathrooms fuse due to high voltage at night.What is the simple solution of this problem?

4 5769

What should be the protection scheme for a 15kw, 3-phase motor working in a lathe machine.

2066

Why voltmeter is not connected in seris & ammeter connected in parallel ?

5 28191

why we use post insulators in no ofstacks at substation for supporting equipment ? why we not use single post insulator

3 5268

which type of cabel

DMRC,

2402

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Un-Answered Questions { Electrical Engineering }

what things to be considered when designing UPS

1776

What is state space method ? Why its used ? Can it applicable on linear, non-linear, 1st order, higher order, homogeneous, non-homogeneous, open-loop , closed loops , stable & unstable systems ?

2042

What is polar plot?

1172

If I want to lift the water at a height 50m from ground level through two inch(diameter) metal pipe then what is the capacity of motor pump is required? is it possible in single phase supply or not?

1891

Its possible to use 3core 2R of 240 sq.mm cable for 3phases & separely 50sq.mm 3core cable fully for Neutral for connection of PCC to MCC 3ph..4wire system?

2097

defination of transistor controlled series capacitor

2634

In siemens S7-300 PLC, what is function and function block ? What is the difference between them ? When to use function and when to use function block ?

3132

Is it possible to protect 3phase overload and earth fault of the 3phase system using two CT's.

2109

explain the process of commutation in a dc machine. Explain what are inter-poles and why they are required in a dc machine.

1173

WHAT IS counter flux IN CT?

1947

Which material is used for the core of a transformer and why?

1100

Direction of flow of active power and reactive power with logic?

1752

Should power factor be low or high?

1176

Anyone who can recommend an equivalent to Envirotemp FR3 of Cooper?

1960

CBCT selection

2276

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