Electrical Engineering Interview Questions
Questions Answers Views Company eMail

what is buscoupler adopter panel????

5 4345

What is Exact meaning for Full load Efficiency and Maximum Efficiency of Transformer? Is there any Difference between? If yes ,please provide with formulae?

Techno Labs,

2 5095

What is the function of an exciter in a generator?

3 8571




What is an exciter and how does it work?

TATA, Lotte Chemical Titan,

6 66704

What is the difference between MCB & MCCB, Where it can be used,

Siemens, ACB Group, Badve, Bajaj Electricals, Hensel, SR,

22 119377

What is encoder, how it function

Coca Cola,

9 39517

what r the checklist while installing a 380 kva DG set

Pepsi,

2294

what r the checklist while installing 500 kva transformer

Pepsi,

674




I want formula to calculate cable size as per load given in kw & amp.I searched many sites but didn't right answer.Plz reply me asap.

MEIL, Lanco, BEL, Biocon, Tata Motors, Sabic, DLF, BRB Cable, Polycab, L&T, Armco, BGS, Doshion, Electrical, Gold Roof, Voltas, Oman Cables Industry SAOG, PK Services, SLV, UMIC, Vertex, Vega, UEM, Crystalline Chemical Industries, System Electrical,

39 292410

what happens when a power transformer neutral earthing broken???

MacLellan,

11 11526

what is power factor? whether it should be high or low? why?

11 6583

what are the various types of earthing? plz give brief detail of all. also post pictures if u have.

Aster Teleservices, Era Infra Engineering, Micron Electricals,

22 28156

what do u mean by bus bar?

6 6979

what is the relation b/w KW and KWH? plz explain with example.

FAG,

6 8086

what is the principle of operation of synchronous motor and generator? explain in detail.

Maruti Suzuki,

2 2201


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Un-Answered Questions { Electrical Engineering }

1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

190


Earth leakage relay basic knowledge principle

596


How they LT panel busbar size choose

225


How can I calculate the Mega watts required to run a plant having many electric motors and other electrical components.

498


what is the meaning of osr in transformer.

106


what are the installation procedure of high voltage power transformer,CT,CB&PT?

543


How generator NPS(NEGATIVE PHASE SEQUENCE TEST)TEST WAS DONE? PROCEDURE WITH DETAILS?

534


At full load wat is the motor p.f And at no load will is the motor p.f?

608


I WANT TO know WHICH WAY IS BETTER FOR CONNECTION BETWEEN POWER TRANSFORMER AND MAIN DISTRIBUTION PANEL. 1-IS BETTER WE USE CABLE? 2-IS BETTER WE USE BUS DUCT? my transformer rate power is 2500KVA

1140


Explain the function and difference of Restricted earth fault, simple earth fault and sensitive earth fault with connection diagram.

1135


bitumar

513


when generator short circuit condition, the current how dissipates. or at short circuit voltage not available then current how can flow?

705


What is the temperature PROFILE OF A FLUID W. R. T. Distance from a sphere to which it is IN CONTACT which is at constant temp.?

401


Pls Breifly explain about UPS (Inverter,Reserve,Rectifier,Float voltage,Boost voltage).

1234


Determine a suitable number of slors and conductors per slot for the starter 1 winding of a 3 phase, 3300 V. SO Hz 300 rpm alternator. The diameter is 2.3 m

401