21. An energy source forces a constant current of 5 ampere for 4 sec to flow through a light bulb. If 3 kJ is give in terms of light energy, the voltage drop across the bulb is . . . . . . . .
22. In the circuit shown in the given figure, current I is
23. In the lattice network, find the value of R for the maximum power transfer to the load
24. The reactance of a 1 Henry inductor at 50 Hz will be
25. Calculate the value of RL so that the power transfer in the given circuit will be maximum.
26. Find Re in k Ω (Assume R = 1 Ω)
27. For the circuit shown in the given figure, when the switch is at position A, the current i(t) = Isin(ωt + 30°) A. When switch is moved to position B at time t = 0, the power dissipated at the switching instant in the resistor R remains unchanged
The value of I and the element X would respectively, be
The value of I and the element X would respectively, be
28. Unit of density is
29. The current I in the circuit shown is
30. The circuit shown in the figure is used to charge the capacitor C alternately from two current sources as indicated. The switches S1 and S2 are mechanically coupled and connected as follows.
For 2nT ≤ t < (2n + 1)T, (n = 0, 1, 2 . . .) S1 to P1 and S2 to P2.
For (2n + 1)T ≤ t < (2n + 2)T, (n = 0, 1, 2 . . .) S1 to Q1 and S2 to Q2.
Assume that the capacitor has zero initial charge. Give that u(t) is a unit step function, the voltage VC(t) across the capacitor is given by
For 2nT ≤ t < (2n + 1)T, (n = 0, 1, 2 . . .) S1 to P1 and S2 to P2.
For (2n + 1)T ≤ t < (2n + 2)T, (n = 0, 1, 2 . . .) S1 to Q1 and S2 to Q2.
Assume that the capacitor has zero initial charge. Give that u(t) is a unit step function, the voltage VC(t) across the capacitor is given by
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