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Electrical Engineering Interview Questions
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A 3-phase IM is supplied from 50 Hz system. It runs at speed of 1440 rpm and slip equal to 4 %. Calculate rotor frequency. A 50 Hz B 0 Hz C 4 Hz D 6 Hz

3 2566

In a voltage-controlled current source A A current booster is never used B The load is always floated C A stiff current source drives the load D The load current equals Isc

953

The Howland current source produces a A Unidirectional floating load current B Bidirectional single-ended load current C Unidirectional single-ended load current D Bidirectional floating load current

1115

To make a basic instrumentation amplifier, it takes A One op-amp with a certain feedback arrangement B Two op-amp and seven resistors C Three op-amps and seven capacitors D Three op-amps and seven resistors

1037

How to design a Unit auxiliary transformer for a power house having a unit of 65 MW and Generating voltage of 11 KV and Secondary voltage of 433V

1106

Why should not we run the IM in low voltage, if runs means what will happen?(for example instead of 400V we give 250V supply)

2 2272

why transformers are put with supply for 24 hours before giving supplying to a locality?

2 2867

how to get bearing & winding temperature of an induction motor?

985

We have 2 11kv/433v transformers for 2saperate acb for mv panels and 1 bus coupler acb. Suppose I’ll close bus coupler what will happen or it will be share the load. Please suggestion and any modification required.

1 2155

10 hp motor ,7.5 kw ,960 rpm, full load current 15.5, delta connection so how much take current no load trial time. any formula please give..... second question :- what is different between brekar control wiring and motor starter control wiring

MSP,

1 5227

funtion of choke

L&T,

4 4579

Which loss in DC machine is maximum?

IFFCO,

1 2706

Maximum efficiency occurs in electrical machines is at i)Full load,ii)50% of full load,iii)Near full load,iv)None of these

IFFCO,

1 3114

CAN WE GENERATE AC WITHOUT DC EXCITATION?

1 2240

HOW TO TEST THE SODIUM VAPOR AND MERCURY VAPOR LAMP ?

1 2763


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Un-Answered Questions { Electrical Engineering }

what is reactive power?, why its measured in VA ? is it transient behavior of system?

1362


what is the Connected Load (kW) or Contract Demand (kVA)of mahindra nasik plant??

8247


The power factor of the fixed load is 0.8, now the p.f is varying from 0.8 to 0.5.

1076


How they LT panel busbar size choose

802


What is the ratio of Booster transformer?

1150






What are the criteria shall be considers for sizing Fuse and MCB? If the rated current is 10Amps what should be the fuse size / MCB Size?

555


what is the safe meggar values for motor, transformer HT, LT and Cables? IF we want to replace I/C bay at our 220 kv substation which is of 140 mw load capacity bay to be replaced by 400 mw capacity bay.other than CT(1200/1) what are the other equipment i have to replace. why we generally use 3.5 core cable or in other word 1/2 core for neutral and also confirm me that in balance conditiob(3 phase)current in neutral will zero

1318


what is x'mer ,isolation x'mer & yltra-isolation x'mer?????

1263


How a capacitor discharge weld power supply works? what is the use of a pulse transformer?

1119


Difference between megger test equipment and contact resistance meter test instruments?

212


If the rated speed of a d.c. Shunt motor is1440 r.p.m, which method of speed control would you suggested to obtain a speed of 1500 r.p.m?

159


how do we calculate length of starting time and repeated starting of a direct online starter?

1099


what is doid

1696


How does "OUT OF STEP" relay ,for Synchronous motor protection, work?

3355


y we use neutral,all r told its used to for closed path..k its a just used to closed path,in a transmission line y we put same conductor used n both phase and neutral..if we use less than phase conductor in neutral mean we ll reduce cost its right r wrong..if we use mean any problem occur in transmission line..

1072