Council for Technical Education and Vocational Training Office of the Controller of Examinations
Sanothimi Bhaktapur
Regular/Back Exam-2078, Magh/falgun
Program: Diploma in Electrical & Electronics Engg.
Full Marks:80
Pass Marks: 32
Year/ Part: I/II (2019)
Time: 3 hrs.
Subject: Principles of Electrical Engineering
Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.
Group 'A' (Very Short Question)
Attempt (Any Twelve) Questions. [12x2=24]
1. What is electric charge? Define electric current
2. Define electromotive force (emf).
3. What happens to the resistance of pure metals if temperature is increased?
4. Write down the time period and number of cycles for 50 Hz power supply in one second.
5. Define electric field intensity.
6. What is dielectric material?
7. What is the permeability of magnetic material?
8. What is coercive force?
9. Define magnetic reluctance
10. State Lenz's law.
11. Define dynamically induced emf.
12. Define coefficient of mutual inductance.
13. Write down the voltages expression for series and parallel connection of battery.
14. Write the expression of magnetic field due to current carrying conductor.
Group 'B' (Short Question)
Attempt (Any Eight) Questions. [8x4=32]
15. Explain the series and parallel combination of resistors.
16. A Pentium wire of 40cm long, 0.04cm in diameter has a resistance of 350. Find the specific resistance of the material.
17. Explain Kirchhoff's voltage law (KVL) with example.
18. If two capacitors of 0.05 F and 0.25 F are connected in series and supplied by 100V source. calculate the energy stored by capacitors.
19. Explain how inductor stores energy. Also derive the expression for energy stored by inductor.
20. Explain about the force experienced by current currying conductor.
21. Explain the Domain theory of magnetism.
22. Explain the Faraday's law of Electromagnetic induction.
23. Explain the magnetic circuit analogy to electric circuit.
24. Explain the parallel correction of cells. Also, derive the expression for equivalent emf and equivalent internal resistance.
Group 'C' (Long Question)
Attempt (Any Three) Questions. [3x8=24]
25. Find the branch current I1, I2 and I3 using KVL and KCL.
Refer to below pic
26. Define magnetic Hysteresis Explain BH curve of ferromagnetic material.
27. Explain the charging and discharging of capacitor and derive the relation of time constant for capacitor charging.
28. Six cells each of 2.1 volts and internal resistance of 1 ohm are in two groups of three in series and two groups are connected in parallel to external resistance of 300. Sketch the arrangement and calculate the current that will flow through external resistance.
Good luck!
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