Electrical Engineering Interview Questions

How do you change an AC motor to DC? why there is only 50 Hz frequency in india & not other?

BSF, TATA,

6473

What is the formula to find out cross sectional area of cable for certain current rating?

MRF,

7095

number of I/O devices in siemense plc

EB,

1678

In electrical what is earth(ground)connection, wht is the importance of it, why it is recomended to maitain below 3VAC between Neutral and earthspecially in PLC used machines?

1786

draw 3 phase rectifier diagram

1743

draw single line diagram of UPS

17072

What are the causes of motor vibration?

4672

WRITEDOWN FEW RELY CODES

1838

how to calculate power factor of capacitor? what is transformer rating?

4318

WHAT IS THE MEANING OF CYWY

6022

How can we calculate C10 rating of a bttery from c5 or c20 ratings??

5114

diameter of cable and core is doubled then the value of capacitance is

3738

why core losses and copper losses does not depend on power factor?

20812

transformer phasor diagram under load explain it?

1714

how wud i know that whether i have to use unitized package substation or transformer?

2820

Un-Answered Questions { Electrical Engineering }

how many parameters can integrate with fire alarm basically ?

1521

advantage of motor design on higher power factor . normally motors are designed for .8 power factor. what is advantage of designing at .88 power factor

1422

i have some screw comprressor with 630kw power,i have established them with simple star to delta circuit,by the way there is so much inertia when the screw comprressors start, can you offer me contactors power with 400vac or any cataluge to choose the contactors

1444

why lightning arrestor are made in two stack of insulator but why not cvt

1554

We have 5 Distribution sections with variable loads&We have 3 Gensets(500kva,380kva&250kva) our total load is between 400kva to 600kva. so how could we connect 3gensets.

1445

Discribe type of fault in DOL and stardelta startor.

1842

what happend to DC shunt motor if its field winding insulation becomes slightly weak? will that motor can run on full load or not explain in detail. thanks

1202

1706

i have applied for junior engineer 2 c&w for Guwahati RRB please send me last five year question paper

1637

For high frequency application we use which transformer?

1371

How they LT panel busbar size choose

1290

11kv/433v delta/star distribution transformer primary side full load Ht current is 83.33A in , but input side VCB rating 800A.why?

1244

How do i right a ladder diagram that has 1 actuator that performs a full stroke followed by a half stroke

1654

what is the use of Auto re-closer?

1683

Can any body tell gulf interview question for experienced electrical engineer ?

1659