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Electrical Engineering Interview Questions

For my plant the electricity department charging some amount for t/f losses. May i know what are transformer losses

L&T,

2099

how to find motors H.P. whout any rating? (only give you a motor and multimeter)

L&T,

3365

In sub-station how to find multifactor of panel?

1889

the process cynide is used for?

2577

fog produced due to?

2566

cc of scorpio?

1234

refrigeration cycle?

3306

what is the saturation point of crgo lamination.

1161

why substation are rated like 11KV or 33KV?

8750

how a DC clampmeter works if DC cant b step up r down?

2129

Phase control and integral control are used for?

1226

What is the gain of 1-s/1=s at 1 rad/sec?

4686

why does make gain margin and phase margin on same plot.?

1099

Q-1 what are the structural and operational difference between a distribution and a power transformer? Q-2 what is skew in motors? Q-3 draw equivalent circuit of transformer Q-4 explain with phasors how pf is improved with loading in induction motors Q-5 DIFFERENT METHODS OF CABLE LAYING(interviewer asked if i heard new chemical based earthing system next) Q-6 pi model of medium length trans line Q-7 v/f control?why Q-8 vacuum circuit breaker operates in?

3809

What will happen if apply dc source for power transformer

3757

Un-Answered Questions { Electrical Engineering }

To make a basic instrumentation amplifier, it takes A One op-amp with a certain feedback arrangement B Two op-amp and seven resistors C Three op-amps and seven capacitors D Three op-amps and seven resistors

1037

1. Can a 12v DC choke operate a 60v/12w PL lamp ? 2. Can a 230v ballast fire / operate a 60v/12w PL lamps.

1320

If the Brush of DC motor is shifted by 90 deg, then what happens to voltage and torque? Both voltage and torque are zero. how to justify the answer?

476

explain why core loss of a transformer is almost constant under different load conditions when connected across a constant voltage and constant frequency.

1559

what will happen if frequency is below 50 hz?

990

how to setting voltage RTCC panel

670

at meter room 50 hrc switch installed,but there are not get earthing proper,so what happen?and 11kv transformer out put going in to hrc main 400a three nog each? so earthing is require for all switch? (some customer made earthing at there home.)

1036

how slip power recovery system work

2003

what is the difference between oil surge relay and buchholz relay.

5762

Explain the experiment on ward leonard method of a speed control on a dc shunt motor with an suitable circuit diagram.

1652

Can RCD's used to protect the VVVF drive if not why.

1227

what are the difference between PLC and embedded

1175

can a 150 kva 3 phase 440v/230V delta-wye step down transformer can be use as step up transfoermer with connected loads at 440v side?

787

What is the formula to calculate the rating of power cable for three phase current.

1185

Do Phase angle measurement have any application in freq/harmonics measurement? If so how?

983