Electrical Engineering Interview Questions

What happen when neutral point connected to core balance current transformer? (Neutral point of an alternator of a 180KVA DG. Neutral point connected to CBCT means enter to the CBCT)

1884

How to calculate size of HT breaker with the help of Amp (current)? Please provide answers with examples.

1955

IF we have 500kva transformer & know the current on HT & LT side, how can we consider for its breaker?

7035

How can we decide cable size from HT panel to Transformer? Please give you reply with some examples.

1817

700KW 6.6KV slip ring induction motor to use VFD to control the speed

2825

1hp= how much rpm

1633

how much earth resistance consider to commissioning the transformer?

5786

in transformer the unit of power is in kva why?

5944

full form of electrical?

CEAT,

2340

how many synchronous motor are there in any power plant

L&T,

1553

Why HT 11 KV Slipring Motors are connected in star ?

1820

Why usually in all electrical equipment taking more current in Y pahse like pumps,compressor,or any other applications

3099

What is difference b/w fuse and breaker?

5440

what is dead tank CT AND what is live tank CT

TATA,

6856

what the effect will occur if we increase the airgap in induction motor

ONGC,

20791

Un-Answered Questions { Electrical Engineering }

how many types are their in switchyard or substation(like D,I TYPE), what is differant between them

1726

what are factors to be consider to design a HT & LT motor?

1877

i need to now what will be the cable size to the following load, transformer to distribution panel distance 110m, load 1000kw, voltage 400v, pf 0.85, permissible voltage drop 2.0%, overhead line, atmospheric temperature 35 degree c.

1232

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.

1520

What is diversity factor in electric installations?

766

What is rotating magnetic field?Discuss elaborately.

2209

How phase to phase voltage comes 440V.

1502

what is arc flash and what are the hazards involved

1729

what is the difference between dry and wet type of 132kV terminations. which one is durable

1613

how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?

2031

how many single tension hardware are required on a double circuit transmission tower?

1518

What will be advantage if we put some load in neutral of grounded star transformer & loadshortcircuit current,rated current of cable & MCB with example?

1472

IF TVM OF TRANSFORMER SHOWS POWER FACTOR ON 33 KV SIDE AS 0.97 LAGGING AND ON 132 KV SIDE IS 0.75 LEADING.IS THIS CORRECT.WHERE IS PROBLEM.

1929

what is LSR?

1774

what mean by analog ,digital,numerical meters and relays? say the example?

1810