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Q. Consider a pair of coupled coils as shown in Figure of the text, with currents, voltages, and polarity dots as indicated. Show that the mutual inductance is L12 = L21 = M by following these steps:
(a) Starting at time t0 with i1(t0) = i2(t0) = 0, maintain i2 = 0 and increase i1 until, at time t1, i1(t1) = I1 and i2(t1) = 0. Determine the energy accumulated during this time. Now maintaining i1 = I1, increase i2 until at time t2, i2(t2) = I2. Find the corresponding energy accumulated and the total energy stored at time t2.
(b) Repeat the process in the reverse order, allowing the currents to reach their ?nal values. Compare the expressions obtained for the total energy stored and obtain the desired result.
Q. Assuming the diode to obey I = IS (e V/0.026 -1), calculate the ratio V/I for an ideal diode with I S = 10 -13 A for the applied voltages of -2,-0.5, 0.3, 0.5, 0.7, 1.0, and
Q. Principle of Three-phase synchronous machines? In fact, with very few exceptions, three-phase synchronous machines are most commonly used for power generation. In general, t
Q. Show Power and Power Factor in ac Circuits? Power is the rate of change of energy with respect to time. The unit of power is a watt (W), which is a joule per second (J/s). T
Q. Explain various functions of telephone switching systems. Ans: Functions of telephone switching systems are: (i) Attending: The system should be continually monito
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Q. Digital demodulator processes? The functions of the receiver in Figure are the inverse of those in the transmitter. At the receiving end of a digital communication system, t
Find the current flow through each resistor using mesh analysis for the circuit below. Step : Determine the number of common nodes and reference node within the network
Systems such as those encountered in mechanics, thermodynamics, and hydraulics can be represented by analogous electric networks, from the response of which the system characterist
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