Basic Electrical Engineering - Questions (Review Questions) Refer this questions for all engineering branches .....

1. Assignment
Signature of the Tutor
Subject Name BASIC ELECTRICAL ENGINEERING
Name of the Tutor Mr.Mathan Kumar.S
Assignment. No. 1
PART – A Two (or) Three lines explanation / Short Answer / Short Calculation
1. Define charge, current and potential difference.
2. Define power. What is the relationship between power, voltage and current?
3. State Kirchhoff’s law.
4. What is meant by active and passive element?
5. Write the basic concept of series and parallel circuit.
6. State ohm’s law.
7. What is a Series and parallel circuit?
8. Compare series and parallel circuit.
9. Give two applications of both series combination and parallel combination.
10. What are the disadvantages of series circuit?
11. What are the advantages of parallel circuits with applications?
12. Draw the symbolic representation of the voltage source and current source.
13. Give the voltage and current equation for an AC through pure capacitance &
inductance.
14. Draw the phasor diagram and waveform for a purely capacitive circuit & resistive
circuit.
15. What is circuit?
16. What is power factor and reactive factor?
17. For the purely resistive circuit excited by sinusoidal varying voltage, what are the
phase angle and power factor?
18. For the purely inductive circuit supplied by sinusoidal varying voltage, what is the
phase relation between current and applied voltage. How are applied voltage and
induced emf?
19. Define apparent and reactive power.
20. State Current division and Voltage division rule.
21. Two inductors with equal value of “L” are connected in series and parallel. What is
the equivalent inductance?
22. Two inductors with equal value of “C” are connected in series and parallel. What is
the equivalent capacitance?
23. What is meant by short and open circuits?

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24. What is the voltage across a short circuit and what is the current through an open
circuit?
25. Name the basic circuit law upon which the mesh method of circuit analysis is based?
26. Name the basic circuit law upon which the nodal method of circuit analysis is based?
27. What is the current - voltage relationship for capacitor?
28. What is impedance diagram?
29. What is the impedance of an RL and RC circuit?
30. What is power triangle?
31. Define average value.
32. Define complex power.
33. Define RMS value.
34. Define amplitude.
35. Define cycle & frequency.
36. Define period.
37. What is phasor diagram?
38. Define Form and Peak factors.
39. Draw the phasor diagram of RLC circuit.
40. Draw the phasor diagram of RL and RC circuits.
41. Define Resonance.
42. Write down the series resonance frequency formula.
43. Why parallel resonance circuit is called rejecter circuit?
44. Why series resonance circuit is called accepter circuit?
45. Define Quality factor.
46. Which type of instrument is called as universal instrument?
47. Give the classifications of measuring instruments.
48. What are the advantages & disadvantages of PMMC instrument?
49. What are the advantages of MI instrument?
50. What are the operating forces needed for indicating instruments?
51. What are the types of wattmeter?
52. What is the use of megger?
53. What are the errors occurred in MI instruments?
54. How the Inductor Differed from the Capacitor?
55. What is the need of damping force?
56. List out the coils in wattmeter?
57. What is the Need of Instrument?
58. Define Error.
59. State the advantages and disadvantages of single phase energy meter.
60. Write down the classification of errors?

3. Assignment
Signature of the Tutor
18 ohm 2 ohm
50v 8 ohm
2 ohm
3 ohm
PART – B Descriptive ( Essay Type)
1. Briefly explain
i) Kirchhoff’s law
ii) Series and parallel circuit
2. Find the Equivalent resistance and the current in the given circuit.
3. i) Derive the total inductance formula for two inductances are connected in parallel.
ii) Derive the total resistance formula for three resistances are connected in parallel.
4. A 50 resistor and a 75mH inductor are connected in series across a 400V, 50Hz
supply. Find the impedance of the circuit, voltage across the resistor, voltage across
the inductor, apparent power, active power and reactive power.
5. Derive an equation for Impedance (Z), Current (I), Power (P), Phase angle and Power
factor in RLC circuit with its phasor diagram.
6. i) Two resistors are connected in parallel and a voltage of 240V is applied to the
terminals, the total current is 15A and the power dissipated in one of the resistor is
2000W. What is the resistance of each element?
ii) A 200W, 220V bulb is put in series with a 150W, 220V bulb across a 440V supply.
What will be the current draw? What will be the power consumed by each bulb?
Will such combination work?
7. Derive the current and power expression of AC through pure Resistance and
Capacitance.

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8. A 50Hz alternating voltage a 240V (rms) is applied independently to the
i) Resistance of 75Ω ii) Inductance 0.75H iii) Capacitance of 75µF.
Find the expression of the instantaneous current in each case and draw phasor
diagram in each case.
9. Explain the concept of “voltage division” and “current division” in an electric circuit
with an example.
10. i) A bulb is rated at 220 V, 400W. Find the rated current, resistance of the filament
and the energy consumed when it is operated for 15 hours.
ii) An incandescent lamp is rated for 100V, 200W using suitable resistor how you
can operate this lamp on 220V mains.
11. i) A coil having a resistance of 40Ω and inductance of 0.75H forms part of series
circuit, if the supply voltage is 250V, 50Hz. To Find the a) line current
b) Power factor c) Voltage across the coil.
ii) Derive the total capacitance formula for three capacitances are connected in
Series.
12. Derive the impedance and power expression of AC through Series R-L Circuit with
its phasor diagram.
13. Derive the impedance and power expression of AC through Series R-C Circuit with
its phasor diagram.
14. Derive the current and power expression of AC through pure Inductance and also
draw a V – I characteristics curve.
15. A capacitor having a capacitance of 50F is connected in series with a non-inductive
resistance of 150 across 240V, 60Hz. Calculate the current, power and phase
difference between current and supply voltage.
16. Explain the Construction and Working of Attractive type moving iron instruments. List
the merits and demerits.
17. With neat diagram explain the construction and working principle of Induction type
Energy meter.

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18. Briefly explain about Dynamometer wattmeter. List the merits and demerits.
19. Explain the construction and working principle of PMMC.
20. With neat diagram explain the operation of Repulsion type moving iron instrument.
21. Find the equivalent resistance using series and parallel combination in the network
shown in Figure.
22. Draw and explain the construction and working principle of Megger. List the merits
and demerits.
23. Draw and explain any one type of the Moving Coil instruments. List the merits and
demerits.