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Electrical Engineering Interview Questions
Questions Answers Views Company eMail

if we have 380 KVA DG. how to calculate Power Factor. With detailed formula

1 4498

why ht11kv supply needs discharging during shut down time

1 2424

what are the advantage of UG cables over the over head lines

DVC,

2 3558

What is corona? and what is the purpose of corona belt in substation ? why they connect these end of the buses ?

2 4841

What are the difference between CT/PT operated Meter and RRAMR Meter for HT/LT application?

ABC, ACB,

1415

why rating of generator is kva but motor is kw ?

4 9947

how to identify small motor and generator?

1 2731

what safety use in electrical panel

3 4374

What is class X ct? What rare its uses?

2 4248

1.What do you mean by inductive and capacitive parts of an electric circuit. 2.What do you mean by decrease of inductane and capacitance of a network? Please dont give me the text book answer.3. What is class X ct and its applications?

2 2712

list the type of vfd? wich is sutable for heating kiln?

AluChem,

1157

How to calculate & connection of 900KVA generator 2 sets & load(1500A)? How to choose cable size and ACB size for this load & generator? please explain me detail. Regards, Mr.Han

Powermec, TATA,

3 8226

working principle of AC Servo Motor with its construction

TATA,

7855

what is IP65 & What is its advantages

1 3370

how to reduce the transformer size in ups ?

2 3588


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Un-Answered Questions { Electrical Engineering }

Why efficiency in thermal power plant is low?

214


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

1174


HELLO EVERYONE, I RECENTLY HAVE FOUND ONE PROBLEM, I WAS TAKING NO LOAD TRIAL OF AN HT MOTOR 920 MOTOR , 1440 RPM , 6.6 KV, WITH AUTO TRANSFORMER. AT 450 V, LOAD WAS 40 AMP AND SPEED WAS 250 RPM. BUT AS WE INCREASE VOLTAGE FROM 450 TO 480V, LOAD BECOME 41 AND SPEED REDUCED TO SOME RPM . SO WHICH PHENOMENON ACTED HERE FOR REDUCING SPEED.?? AND IS IT HAPPENING ALWAYS OR IT IS RARE? I ALSO HAVE FACED SUCH PROBLEM WITH FEW LT MOTOR ALSO.

998


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?

615


what is the voltage rating of chiller unit sensors

1904






What is speed mode?

756


A 400 V, 50 Hz, Δ connected synchronous generator has a field reactance of 0.1 Ω and armature resistance of 0.015 Ω. At full load, the machine supplies 1200 A at 0.8 pf lagging. Under full-load conditions, the friction and windage losses are 40 KW and the core losses are 30 KW. What is the machine’s overall efficiency? Ignore any field circuit losses.

848


What is I to C?

1197


Shall I use 40A semiconductor Fuses in 32 A SFU ? Frame size is same. What Happen if Fuses burn on SFU?

1113


How many types of losses occur in a transformer?

193


What is the difference between isolators and electrical circuit breakers?

206


How to derive detailed design of Suitable bus Bar for 100A for 6.6KV?

1086


What is the function of under voltage release ?

559


describe the Tranformer testing procedure

1006


how current is reverse from its normal direction during the fault?

1566