REVIEW QUESTIONS 1.Draw the impedance triangle for a RLC series circuit and write the expression for impedance.
2.Explain what is meant by leading and lagging p.f ?
LEADING POWER FACTOR:
In a circuit it current (I)lead the voltage is called leading power factor
Example-RC Circuit
LAGGING POWER FACTOR:
In a circuit it current (I) lag the voltage is called lag power factor.
Example- RL series circuit
PART – B : 3 Marks Questions
1. Define alternating quantity, amplitude and cycle.
2. Draw a sinusoidal voltage waveform and mark the cycle, time period and peak value.
3. Define: (i) Cycle (ii) Frequency (iii) Time period
4. Define : (i) Instantaneous value (ii) time period (iii) frequency
5. Define average value and RMS value of a.c quantity.
6. Derive an expression for average value of a.c quantity in terms of maximum value.
7. Define Instantaneous value of a.c current and write the equations in 3 different forms.
8. Explain the terms: (i) Form factor (ii) Peak factor
9. Prove that power drawn by a pure inductor connected across AC supply is zero.
10. Show that active power in pure capacitor connected across AC supply is zero
11. Draw impedance triangle and phasor diagram for RC series circuit.
12. Draw impedance triangle and phasor diagram for RL series circuit.
13. Draw the impedance triangle for a RLC series circuit and write the expression for impedance.
14. Define Power factor.
15. Explain what is meant by leading and lagging p.f?
16. Briefly explain about power triangle.
17. Explain the terms: (i) apparent power (ii) active power (iii) reactive power.
18. Draw admittance triangle and phasor diagram for RL Parallel circuit.
19. Draw admittance triangle and phasor diagram for RC Parallel circuit.
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