20% Exam
Electrical Engineering Quiz
Test your knowledge in electrical engineering with our engaging quiz! Covering topics from transformers to DC machines, this quiz is designed for students, professionals, and anyone interested in the field.
- Multiple choice questions
- Real-world applications
- Instant feedback on your answers
1. The coil voltage of 150 turns, 30.03 mWb and 50-Hz supply frequency is:
220 V
1000 V
380 V
2. The resistance seen by HV side of a transformer has a turns ratio of 10. If a resistance of 2Ω is connected in the LV side:
0.002 Ω
0.02 Ω
200 Ω
3. A turns ratio of a transformer is 10, the LV voltage and current are 20V and 10 A. The values of the voltage and current in the HV side are:
200V, 1 A
2V, 100A
200V, 100A
4. The output power of a transformer is 10 kW and its copper losses are 300 W and iron losses are226 W. The efficiency of the transformer is:
97%
97.8%
95 %
5. Induced voltage of a DC machine has 2p=4, 2a=2, m=8 mWb, n=600 rpm, Zt = 600 conductor is:
96 V
48 V
2880V
6. If a DC machine has Ea=216V, k=1.182 V.rad/s, then the machine speed is:
1500 rpm
1760 rpm
1745 V
7. The armature current Ia of a dc motor is 47A and (kph)rated=1.182 V.rad/s, then the motor torque is:
55.55 Nm
39.78 Nm
47 Nm
8. The synchronous speed of a 3-phase, induction motor of 8-poles and supply frequency 50 Hz is:
1500 rpm
750 rpm
1000 rpm
9. The speed of 3-phase induction motor has a slip of 4% and ns=1500 rpm:
1500 rpm
1560 rpm
1440 rpm
10. A 3-phase induction motor has a rotor current of 10 A, slip of 4% and Rr=0.75Ω, then the mechanical power is:
5400 W
5625 W
150 W
The two types of three-phase, induction motors are:
Stator and rotor
Squirrel cage and wound rotor
Slip ring and permanent magnet
The two types of DC machines (Excitation consideration) are:
Salient and cylindrical poles
Separately and self excited
Shunt and parallel machines
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