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Electrical Engineering Interview Questions

No load test of induction motor is carried out to compute= A stator resistance B rotor resistance C magnetizing reactance D rotor reactance

3801

Short circuit test of induction motor is carried out to compute= A stator resistance B rotor resistance C magnetizing reactance D stator reactance

4556

Auto transformer starter gives the same effect as star/delta strater if its turn ratio = A 0.5 B 0.67 C o.66 D 0.577

2344

Rotor resistance starter is used to obtain= A increased starting torque B decrease starting current C decrease starting loss D increase efficiency

1391

Plugging is a phenomenon to= A braking the motor B to accelerate the motor C to run IM as generator D to start the motor

1888

The slip during plugging operation is given by= A 1-s B 2+s C 1+s D 2-s

1883

During regenerative breaking= A rotating magnetic field is reversed B slip is positive C torque is positive D slip is negative

1053

In which of the following case, the rotating magnetic field is reversed? A regenerative breaking B plugging C dynamic breaking D forward motoring

1057

29 Which of the following breaking method save energy? A regenerative breaking B plugging C dynamic breaking D none of above

2489

Electromagnetic torque developed by the motor is compared to shaft torque. A less B same C depends on motor design D more

3103

Electromagnetic torque developed by the motor is compared to shaft torque. A less B same C depends on motor design D more

1057

An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The rotor reactance at stand still is A 2 ohm B 1.25 ohm C 3.15 ohm D 2.25 ohm

1333

An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The slip when motor stalls is A 1 B 0 C 13.33% D 10.33%

961

An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The rotor frequency at maximum torque point is A 3.33% B 4.44% C 5.55% D 6.66%

2401

In an ideal transformer no load primary current I0 A lags behind V1 by 90 degree B is in the phase with V1 C leads V1 by 90 degree D lags V1 by 45 degree

2348

Un-Answered Questions { Electrical Engineering }

Why let through energy not considered for ACB breaker while cable sizing?

1320

The simple way of finding the leakage quantity and % in compressed air distribution system

729

how calculated Transformer losses.

980

please send 5yearje solved papers on my email himmatsinghnathawat@gmail.com

998

Starting current of a 10 HP induction Motor is ______ time’s full load current.

612

which book to refer in electrical engineering for iocl exam & which book for general english.

1285

Dear sir, I completed DECE In the year 1995.Now i am working in a private company from last 10 years as an Electrical supervisor.The company having a 1000 KVA transformer.Now i try to apply "C" Licence. I am eligible or not.If not eligible,pls give solution.

766

List examples of voltage source?

155

plese send me the oces/dgfs sylabus and previous year question pattern of electrical engg.?

1350

after how many spot we must chang secondry cable in portable spot welding gun?

1012

147

What are the factors influence the choice of an electrc drive?

1103

what is the use of sdf?

1174

If i have two 3000 kW motors and the whole facility requires a 10 MVA transformer. What would be better installing two 5 MVA transformers(one for 1 motor ) or just a single 10 MVA transformer for both of them. Give reasons for your answer.

3424

how can tell us the AC indoor or outdoor which Tr and formulls

851