(a) The following figure shows a switch arrangement, forming a power electronic converter. The given input and desired output waveforms are shown. Decide a switching function which will provide the given output. Vac A S₁ + S₁ V dc Vac V dc t (b) Now, draw a circuit on the output side which provides a closed path for the current. Ensure that the basic principles of interconnection are obeyed. (c) In the circuit that you have drawn, find out which combination of switch states are allowed. (d) Now, assume the input source and the corresponding converter output are current stiff with the same input and output waveforms as shown in the figure. Draw the new converter configuration, clearly showing the required changes in switch orientation. (e) Answer questions a to c for the configuration obtained in part (d). -

The Weibull distribution is widely used in statistical problems relating to aging of solid insulating materials subjected to aging and stress. Use this distribution as a model for time (in hours) to failure of solid insulating specimens subjected to AC voltage. The values of the parameters depend on the voltage and temperature; suppose ? = 2.2 and ? = 220. (a) What is the probability that a specimen's lifetime is at most 250? Less than 250? More than 300? (Round your answers to five decimal places.) at most 250 less than 250more than 300 (b) What is the probability that a specimen's lifetime is between 100 and 250? (Round your answer to four decimal places.)   (c) What value (in hr) is such that exactly 50% of all specimens have lifetimes exceeding that value? (Round your answer to three decimal places.)  hr

A coil with 193 turns has a magnetic flux of 37.3 nT-m² through each turn when the current is 1.90 mA. (a) What is the inductance of the coil? What are the (b) inductance and (c) flux through each turn when the current is increased to 3.53 mA? (d) What is the maximum emf & across the coil when the current through it is given by i = (2.72 mA)cos(wt), where w = 205 rad/s? (a) Number 3.788894737 Units mH (b) Number 3.788894737 Units mH (c) Number i 6.929947369 Units nWb (d) Number i 2.112687705 Units V

5. The magnetic flux through one turn of a 55-turn coil of wire is reduced from 29 Wb to 5.0 Wb in 0.80 s, which results in an induced current of 36000 mA. What is the total resistance of the wire in the coil.