Electrical Engineering Interview Questions

When calculating the speed of a rotor required for a particular frequency of synchronous generator we use the equation 60f/p Is this p is the number of pole pairs of rotor & do we consider the number of pole pairs in the stator is 1?

UOM,

1368

Importance of fault current in power transformers and how to monitor the same? How is it different from winding temperature?

1338

3,12,24,33,_ ,75,150 Find the missed number in this sequence

HCL,

18694

What is given by the definition in BIL IMP/PF = 950/395 kV. This was found in a name plate of a power transformer.

AES,

1849

can we keep open the secondary of current transformer?

2256

is dc transformer is possible ?

4016

is this the formula of building wiring to get the main breaker.Watts/volts*.8%+higher motor*(25%)=ampere. yes or no or send the correct formula for building wiring.

1181

why we generate 11kv power supply in generating station?

DBG, NTPC,

3054

what will be the effect if you were using different brands of outlets?

1474

What will be the output of an alternator ,if the field current is single phase ac supply.

DRDO,

2700

2217

What is the function of turbo charger in generators

2862

Which rccb 30ma,100ma,300ma sensitivity should be used in domestic line and what is difference, advantage and disadvantage of all three

19568

sir, in a industry present pf is 0.54 pf 25hp power is there its want improve 0.9 pf. which suitable capacity capacitor is suitable please inform me.

2858

what will happen if synchronous machine rotor fed from single phase ac supply

1307

Un-Answered Questions { Electrical Engineering }

what is auto re-closer?

2002

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

8890

if 12v battery get discharged for 2 months after if we put charge it will charge again?how much time it will take to charge?

1531

WHAT IS MEANING OF Gg & Gg IN hrc FUSE

2854

In ht capacitor ckt we are using LBS Panel it having isolator with fuse, one of HT fuse flash over, so what is reason behind this event.

1593

I am inpecting a 10kVA UPS what tests should i do and should i observe?

1804

How can i get my certificate of competency as an electrical supervisor? I have complicated my B.Tech from Uttarakhand technical university this year (2012).

4003

A 10 MVA, 66KV, 50Hz, Y-connected 3-phase alternator has synchronous reactance of 0.635 Ù. It is working at full load at 0.8 lagging p.f. condition. Find torque angle, neglect armature resistance.

2088

what is the condition for YnD11

2086

What is the exact formula for one weber of magnetic flux?

1677

what is the difference b/w ATS and HTS?

1716

What is the resonant peak?

654

How the frame size of a flange mounted AC induction motor is calculated?

1524

what is the need of starter in tube light and what type of starter is used in that?

1521

For a three phase induction motor, what will be the effect on motor if the neutral of the system is shifted to say 20 deg.?

1408