Electrical Engineering Interview Questions

The formular of how to calculate a cross sectional cable to feed an electric motor. Examle: 15KW, 26.1A, 415V. Calculate the cable size in mm2

Sona,

6705

Can you explain the phase displacement between primary and secondary of power transformer of any vector group(for ex)?

2549

I have two power supply.a)govt. power b)Captive power.3 phase load connected inside factory.when source change govt. source to captive some motor rotate reverse. Is phase sequence changes when if off & on?If I off generator & on it again is it possible to get changed phase sequence??

ABB,

5362

what is the relationship between current and frequency in AC circuit?

38395

if i have one capacitor=80 micro farad which correct the unity power factor,but i want to make capacitor bank who correct the power factor.so,how to split this capacitance value?

3288

What is function of condenser in fan?

7262

WHAT IS RMU AND WHAT IS ITS FUNCTION AND HOW TODISCONNECT

Bhel,

7347

WHAT IS REACTIVE POWER?

4101

In the diesel generator wihch type of power we can get it ? Like AC / DC

4664

in breather of transformer how sillicon gel absorb the moisture?wat happen when the moisture in that oil?

3504

why transformer ratings are in kva

5122

What are all the points to be checked while decanting diesel from tanker lorry to HSD YARD

2897

What are all the points to be checked for a newly re-winded motor before installation

3657

sail kaott diploma ece ke interviw me qus.kis parkar ke aate hai aur G.S me kya puchate hai kya sameedyaan me kis parkar ke qu.puchate hai

Sail,

2927

What motor is used in ceiling fans and what motor is used in table fan.? why table fan is costlier than ceiling fan?

Bhel,

26630

Un-Answered Questions { Electrical Engineering }

what are the difference between AC lamp and DC lamp

1695

What are dcs and plc?

695

What are the Return ( Monthly / quarterly/ Annual submitted to Electical Inspector for an establishment (Factory in Maharashtra-- Small scale category having seperate HT line of 22KV ) as per Maharashtra Electricity Act

1598

What are the different circuits in thermal power plant?

732

sir i ve applied for hindustan petroleum and power grid india ltd..and the exams on feb 22.can you pls send model papers and tell how to prepare for those.i need to get into any of these for sure.....

1757

WHY IL=IPH IN STAR AND WHY IPH=IL/1.732 IN DELTA? WHAT IS REASON BEHIND IT?

5616

dg started in plc mode and load taken later one battery terminal connection will be disconnected by loose connection what will happen for dg and shall we connect battery terminals while dg in load time?

1538

Why we use duplex coil and hook switch in telephone system?

4601

HI....HOW CAN BE MESARED THE VALVE OF NEUTRAL GROUND RESISTOR WHIC IS LOCATED AT SWICHGEAR ON GENERATOR SIDE....

1631

how r charge carriers produced

1649

why should the lowest unit of a testing transformer ( cascaded transformer ) have higher power rating??

1894

What is the meaning of HT Trivector Meter ?

1966

all interview questions with answers of ntpc (2000-2009

1792

ACCORDING TO IEC WHAT SHOULD BE THE MINIMUM HEIGHT OF G.I. STRUCTURE OF CT, PT, ISOLATOR, LA?

1630

how to calculate energy of 3-phase motor?

1567