Electrical Engineering Interview Questions

difference between ac motor and dc motor

15624

why aggregate is placed all around substation ground.

8877

whats is MARX CIRCUIT?

7793

What are the earth resistance Standards of 66kv sub stations according to indian norms.

1973

what will happen when a bulb s connected btwn two phases of a three phase delta connected source?

5198

why ac supply neutral should earth not in dc (-)

4246

Which Kind of machines(in terms of poles) give the smoothest DC

788

Which type of gas used in cylinder (VCB)?????

ICSA,

11164

If I want to use capacitor banks at HT (11 KV) side for maintaining power factor then which type of capacitor should I use? Plz give me the specification?? (I am using 1250 Kva transformer (11 KV/433V)).

7902

how to calculate lux level in out door (yard lighting) please expalin with a example

3668

What is the major difference between cnc and plc. why cant we use plc instead of cnc

29108

What is difference between ball screw and lead screw.

7110

selection of conductor in different voltage?

TATA,

1676

What is the most accurate way of testing ELCB?ELCB is better than RCD?

GECO,

2059

what is MFD value in capacitor?I have 201 Kva load & reactive power is 150 Kvar. so how it is calculated?

IIT,

6523

Un-Answered Questions { Electrical Engineering }

a)In a 3-phase 4-wire circuit, a circuit breaker is selected to protect the circuit whose highest fault level is 6.6 MVA. Determine the required minimum breaking capacity in kA. (Note: Covert 3-phase power in terms of kA to find answer.) b)Using the below, determine the required minimum making capacity in kA as a “peak value”. Rate breaking capacity (Icn) ka: Icn<= 1.5 Factor = 1.41 1.5

442

what is draiv work

552

i karmveer bharti persuing b.tech . plz send me syllabus and name of reference books. for preparation of section eng.

869

HOW TO CALCULATE EARTHING SIZING?

740

CPC cable .PVC \1C....I want to get sure that type is flexible indoor or to be install on trench. please advice .thanx :)

650

acb(AIR CIRCUIT BREAKER)NOT CHARGING AUTO

934

Is it possible to use a S1 duty class motor for crane application (S4)? If not, why?

1011

In MEP Services what are parts of STP and what are there function?

1017

in my working site. momentary jerck in electrical supply ocurred frequently which cause of multiple losses in our electrical equipements. how can we protect our electrical machines and equipements in this situation.

1490

What is the reason for using a GE G101 MCB in place of an EP102 MCB if both are capable of AC circuit protection?

1332

A power transformer 4MVA/11KV/0.415Kv has been out of use in 12years. what maintenance actions/test need to be carried out before energizing.

185

how to calculate sizing of NGTR (Transformer rating,Loading resistor value and Current rating of resistor) and what is the X/R ratio. Details : 11kV,Capacitance 1.73532 micro farads,40kA for 1sec.

862

1. A bomber drops a bomb from an aircraft flying at 2000 km/hr. at an altitude of 7km. The speed at which the bomb will strike the earth would be

691

Can we use shunt trip coil instead of trip coil with protection relay for protection?

478

PAC and simple Ac different

156