Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What is master trip relay? How does it work?

1 4139

What is the difference between PLC & DCS?

Power Plant,

1 1160

What is the instrument to check the rotating diode fuse of alternator in running conditions?


why in dc generator field rheostate kept in maximum position?

1 2691

What is Harmonics how it is produced and what is the method to control the same



Why dc voltage used to excite alternator field in stead of ac?

4 4548

why voltage rating of transformers are in multiples of 1.1?

3 3335

what should be distance between phase to phase in 415v system?


1 4165

can we correct the p.f.of ac generator?


2 3536

What is the effect of impedance on the heat losses in case of AC system??? Does heat losses really depends on the impedance or depends only on resistive component only..??

4 3113

In a poly phase circuit if clamp on meter shows same load on three phases and their sum on neutral then why we use three and a half core cable or maximum the same size of core as that of phase?

1 1904

how to determine kilowatts (real power) is used in energy meter? is it apparent power effect the disk rotation?

1 1922

When will you multiply and devide with derating factors to the actual value while sizing the cable?


why we are used armed coble for wiring of 3phase motor?


3 3013

how to improve my communication skills

Infosys, MAHINDRA, Wipro,

7 5429

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Un-Answered Questions { Electrical Engineering }

how to calculate cable size in diffrent loads?


What should be the voltage between Neutral and Ground in secondary side of the step down transformer (230 V to 110 V) with no load condition?


what is the size of ht cable of 33kv ht line and transformers ratings are 1 Mva and 5mva.please send formula also.


what is is the potential diffrence between two phase ?


what is the difference between switchgear and circuit breakers and is there any difference between outdoor and indoor switchgear and circuit breakers , and how would you differentiate between switch yard and substation and grid station . thanks


what happen if the supply is given to the stator of the 3phase induction motor with out assembling the rotor ?


if the armature current in a dc generator is ac ( sinusoidal ) why doesnt the sjhape af armature mmf a sinusoidal (ni) ? armature mmf in case of a dc machine is triangular.


Briefly define and explain the following different types of Pulse Amplitude Modulation (PAM) with some examples. i) 2-PAM ii) 4-PAM iii) 8-PAM iv) 16-PAM v) Quadrature Amplitude Modulation (QAM)


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


why we use two slope(differential & restraining) in differential relay.but in busbar protection differential we are using only one slope?please explain


Is there any problem about which the drive (inverter) doesn't show/display the alarm and/or fault but instead of this , it doesn't work ? I want to know that could there be any kind of problem in the drive when the drive doesn't display the alarm and/or fault ?


Explain the following and how these are working with PLC Unit 1 I/O Module Card 2 Adaptor Card 3 Ribbon Adaptor 4 I/O bus 5 I/O Devices


I have a small system with two motors that are running on 380 vac, 60 hz. These motors are expensive and I usally get them from Brazil. I am adding another motor to the system, but I want to purchase a 480 vac, 60 hz motor to use. It will be on a VFD that is rated fro 380 thru 480. Is this posible and will I have to use a larger motor and derate it?


How to calculate no of Lighning arrestors are required for protecting 50mX 50m*20m cubical building and locations of LA?


what is the physical connection of a analog i/p to a analog i/p module (ab plc)and through a analog o/p module(ab plc) to a analog o/p . and how all the process control by scada