Basic Concepts 1.docxBasic Concepts 1:

1. Draw the following waveforms.

1. 2cos(2*pi*4*t )2. 2cos(2*pi*4*t  + 300)3. 2sin(2*pi*4*t )

2. What is the physical interpretation of phase in time domain?3. Let the phase difference between two cosine waves of frequency 50Hz is 30 degrees.

What would be the corresponding time delay (Ans. 1.66msec)4. Let v(t) = 120cos(wt + 20) and i(t) = 30cos(wt – 30). Which one is lagging and which one

is leading.5. Let v(t) = 120cos(wt + 220) and i(t) = 30cos(wt – 30). Which one is lagging and which

one is leading. (Ans. Current is leading as +220o = -1400).6. Let v(t) = 120cos(wt + 220) and i(t) = 30cos(wt – 30). Determine their phasors and plot

them on phasor diagram.7. What is the phasor plot of the quantity 25ej30ejwt?8. What is meant by impedance? What is meant by admittance? What is meant by

Reactance?9. Why does when a circuit is transformed into phasor domain all the techniques of resistive

circuit analysis become valid.10. What are the impedance and admittance and reactance of R, L and C.?11. What is the phase difference of a voltage and current across a resistor? Which one is

leading?12. What is the phase difference of a voltage and current across a capacitor? Which one is

leading?13. What is the phase difference of a voltage and current across an inductor? Which one is

leading?14. For the circuit shown below, what is the difference between the phase of output voltage

and current? If we want to reduce this phase difference to zero degrees what should be done.

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