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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

how instantanious short circuit current is calculated ? its formula.

1209

sir, my question is that if we start any three phase induction motor with star connection.will be current taken ? please send a formula.

ABB,

6948

i have a roll dia aprox.43 inches and gear box ratio is 14.3.so my question is how was decide the kw rating of motor.

1921

How do you convert the lt amps on a transformer to the ht amps?

10022

Which UPS (inverter) is better and why ? 12 V inverter and 24 V (two 12 V batteries in series) inverter which is better ......... which has the longer backup which has the greater charging time which has the greater discharging time thank you

2609

why dont we connect the two 12 V DC batteries in parallel, for an inverter (UPS)? is there any harm ?

4015

How one can check the MAIN of a house wiring ?

1054

1 Ton = ? amperes & power. How much power 1.5 TON split AC consumes in an hour at 17 C , 26 C & 28 C (thermostat' temperature).

396384

What is the Different b\w Circuit Breaker & Isolater

8446

WHAT IS ND RELAY AND HOW DOES IT WORK?

3216

Can I use measuring current transformers in protection purposes?

9012

how to determine the cable size...pls explain me with the formula taking particular load....does the factors like impedance & short circuit rating influence the cable size, if so how....

1209

Can CT Secondary left open circuited and why(reason)?

7686

When capacitor bank connect on line. It's draw some current but it's current not increase of main line ammeter. Why?

4636

how to set time from star to delta starter

11472

Un-Answered Questions { Electrical Engineering }

what is the string efficiency

3833

why is control bus bi-directional?

1265

need to make a report. Need to choose a 3phase induction motor. Load conditions motor will operate in : Maximum Load: 30 Kw Speed: 2950 rpm Ambient temp: 20 cent Supply voltage: 440V Frequency: 50Hz need to look for the safety factor when choosing the motor, went through catalouge found a few, but dont know how to choose the safety factor allowing an extra load something above 30 KW to avoid any harm.

937

Enlist four components of electrive drives.

1058

Can you please explain creepage distance in detail, for a 6.6kV cable head what must the distance be and how do you determine it?

1790

What is the breaking capacity of transformer and how can we calculate the breaking capacity of tranformer

854

In siemens S7-300 PLC, what is function and function block ? What is the difference between them ? When to use function and when to use function block ?

2237

What is the method of estamating of cable, CB,MCB ?

1189

what is the size of cable for 15kw motor and 85 meter cable length using with vfd

1561

High voltage test procedure of in swgr board. why should measure millivolt drop on testing time?

1213

for 11KV OH system what will be typical per KM "R" "L" "C" parameter. for 33KV OH system what will be typical per KM "R" "L" "C" parameter. for 33KV UG system what will be typical per KM "R" "L" "C" parameter.

1405

Control wiring of a dol starter for forward and backward

578

How to convert 2 phase to 3 phase electricpower in induction moter?

1182

what is The difference between national electrical code and I.S.Code (electrical) and what is the value of NEC in electrical engineering field

1065

If breaker is undefined position, first step to do.

1347