Electrical Engineering Interview Questions
Questions Answers Views Company eMail

What are difference between earthing switch and earthing truck ? What is the operation philoshopy of earthing truck ? Wht are the component of earthing truck ?

Reliance,

2 12514

Befor synchronissation of Generator what test to be carried out.pl.specify with reason.

Kanoria,

3 3301

What is In (current rating) shown on the MCCB? Is this full load which can withstand by the circuit breaker

4 6977




what is mean by marshalling box in transformer?

Reliance,

7 56002

how the 6.6KV motor can be used with 11KV?

2 5748

What happens if a three phase induction motor is suddenly single-phased while running? Which type of winding connection will be affected?

DRDO, FACT, B4S Solutions, SL Electricals,

22 50643

please tell 1 ton equal to how many kilo watt?? in some converter software's that is 3.5 kw. is it right?

Mitsubishi,

8 12540

for compensate 315mh inductance ,how many capaciance required?

Mitsubishi,

820




for compensate 315mh inductance ,how many capaciance required?

Mitsubishi,

1 3675

what is meant by line voltage and phase voltage in a three phase transformer?

2 4071

"What is the difference between voltage and potential differnce?"

15 28374

why most of the substations are rated in multiples of 11?

4 5166

how one can design armature winding bothh front and back connection

1 1962

what is the difference between synchoronous and alternator and induction motor and generator

2 11826

How much current flow in no load condition of a motor?

8 6862


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Un-Answered Questions { Electrical Engineering }

Explain Even and Odd signals?

460


Briefly describe your ideal job?

1645


why only exciting current is shown not primary current in transformer???

609


7- What is the Dissipation Factor and the difference between it and Insulation Resistance Test? 8- What is the task (function) of DC and AC reactors in power plant? 9- What is the task (function) of (open delta with earthed) in some types in transformers? 10- What is the base of the selection of the vector group in transformers? 11- What is the zig-zag transformer and its function by drawing in large detail? 12- What is the polarity ? 13- Why we make short between phase(R) in high side and phase (r) in low side in vector group test? Where High Side ( R ,S and T ) and Low Side ( r ,s and t ). 14- What are the time on delay and time off delay? 15- What is the vector group? 15- What is the task (function) of different types of vector group such as Dyn11 , Dd0 , YNd1,……..,?

835


a)In a 3-phase 4-wire circuit, a circuit breaker is selected to protect the circuit whose highest fault level is 6.6 MVA. Determine the required minimum breaking capacity in kA. (Note: Covert 3-phase power in terms of kA to find answer.) b)Using the below, determine the required minimum making capacity in kA as a “peak value”. Rate breaking capacity (Icn) ka: Icn<= 1.5 Factor = 1.41 1.5

373






How PADO software increase the efficiency of power plant?

4286


i am going to give the JSEB,RANCHI exam for power plant,so i need some samples of papers related to that,so please send me these papers by my mail id.

2214


how to design step down 12 V, 1mA small transformer from 220 V AC? Because according to VI relation and power transfer it results bulky...

840


which are the criterias needed to select the kind of neutral earthing(solid earthing,resistance earthing,etc.) at various voltage levels in electrical distribution?

693


what is the prosses for getting of 33kv licence (i have completed my engineering degree & working in 33kv substation for contract basis )????

506


what are the usual topology of transformers at different substations in the power system and why that particular topology is choosen. what are the limitaions of that topology?

677


is it possible to say motor horsepower number without seeing name plate(when name plate damaged)

748


What is the vector group of a transformer,how can it be found out?

763


What is PQA???Applications........

1066


need to make a report. Need to choose a 3phase induction motor. Load conditions motor will operate in : Maximum Load: 30 Kw Speed: 2950 rpm Ambient temp: 20 cent Supply voltage: 440V Frequency: 50Hz need to look for the safety factor when choosing the motor, went through catalouge found a few, but dont know how to choose the safety factor allowing an extra load something above 30 KW to avoid any harm.

540