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ZID: ELE 440/540 Exam 1 Fall 2019 Page 2 of 7 Problem 1 (Four points if only the correct answer is circled. No partial credit.) a) Which of the following switching devices does not have a control signal but relies on the circuit's currents and voltages to turn it on and off? i) MOSFET ii) Diode iii) SCR iv) IGBT. b) In a gate drive circuit a bootstrap capacitor is used to a) supply a level shifted voltage to the gate drive circuit b) force the gate drive to remain at ground level c) filter the output voltage of the switching power pole d) filter the input control signal of the gate drive. S1 $2 Answer the question below based on the circuit above. In this circuit S1 and $2 are switched on and off alternately in a regular cycle. c) Which switch needs to be a controlled transistor? i) neither switch ii) $1 iii) $2 iv) both S1 and $2 d) Which switch could be replaced with a diode? i) neither switch ii) $1 iii) $2 iv) both S1 and $2

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ZID: ELE 440/540 Exam 1 Fall 2019 Page 2 of 7 Problem 1 (Four points if only the correct answer is circled. No partial credit.) a) Which of the
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