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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 mutualinductance 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 final values. Compare the expressions obtained for the total energy stored and obtain the desired result.
emf equation
Q. A 25-kVA, 2400/240-V, 60-Hz, single-phase transformer has an equivalent series impedance of 3.45 + j5.75 referred to the primary high voltage side. The core loss is 120 W. Whe
Differentiate between n and p type semiconductors. n - Type semiconductor:- (i) If small amount of pentavalent impurity is added with, to a pure semiconductor giving a la
When recording infrasound waves or microwaves how do they vary from one another? Ans) By microwaves, do you mean "radio signals", like in a microwave oven? These have nothing t
Metering Techniques The techniques of metering could be categorized depending upon the voltage at which consumers are fed as: 1. LT (Low Tension) Metering, and 2. HT (Hi
An electromechanical voltmeter with internal resistance of 1 k and an electronic voltmeter with internal resistance of 10 M are used separately to measure the potential differenc
Q. Consider two 1-C charges separated by 1min free space. Show that the force exerted on each is about one million tons.
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Solve using data from the DC machine data sheet, using the "hot" resistance value for all calculations. Note that the value of K on the sheet is for rated (100%) field flux. Assum
ferroelectric materials are charatrised by
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