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Electrical Engineering Interview Questions

Corona occurs between two transmission wires when they (a) are closely-spaced (b) are widely-spaced (c) have high potential difference (d) carry d.c. power

3338

which type of winding is used for high voltage & low current?

GEB,

1145

Can any one give an explanation about rating factors of cable? if we are laying the cable on the air with an temp 15 degree then rating factors will be 1.15 and if we are laying the cable on the air an temp 60 degree then rating factor will be 0.76 please describe it and what is the difference between rating factor and derating factor?

644

Difference between rating factor of cable and derating factor of cable?

733

what size steel armoured cable is required to support 1500kva capacity. would 70mm squared be enough or would I need 90 or 120mm squared 3c plus earth

622

single phase voltage 230 and Three phase voltage 450 why 690 voltage

XYZ,

1362

Why PS class CT is always preferred for Differential protection?

676

Who are the manufactures those manufacturing 3Cx2.5sqmm FRLS cables. I heard about FRLS technology adopted only in wires useful for wirings

1203

For 160kw motor what size of cable and material is needed.?

911

how to calculate IR value of 33KV cable ??

894

How many battery required for an 3kva online ups with 3 hrs back up with usage of 3 fans,3tube lights

1066

list the advantages of RCCB over other circuit breakers?

902

what will happen if dc is supplied in acb or mccb or other circuit breakers?

754

sir, 3phase induction motor takes different pf and different KW in three phase while running,explain reason

605

3ph motor running with unequal kw and different pf what are the reasons

824

Un-Answered Questions { Electrical Engineering }

explain different losses in a transformer.

240

What is evaporator & condencer & compressor

1185

how ups works ? various parts of ups and working principle

1055

How to Calculate Current Rating of SDFU (Switch Disconnector Fuse unit) for Protectionof Capacitor Bank connected to Busbar of 800Amp,in LV side of 11/0.433KV, 250KVA Transformer?

3998

What is zero of the system?

238

What is meant by bus bar protection?

227

When are the directional relays used?

218

what is the criteria for selecting fuse rating in 1phase, 2phase & 3phase welding sets?

985

What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works?

1105

why zero sequence impedance measurement is not applicable for single phase GT

1261

3 phase induction motor connection star or delta while using ac drive motor is .75 to 5.5 kw

1103

What are the material used for inductance coil?

245

Anybody know how schematic diagram for reverse power relay? RPR for generator protection

1209

WHAT ARE THE DATAS REQUIRED FOR PROTECTION AND METERING AND CONTROL AND LOGIC PREPARATION,HOW TO STUDY THE PROTECTION AND METERING?

1253

Can anyone explain me about the capacitor calculation

1230