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Electronics and Communication Power Electronics Difficulty: Medium

Power electronics essentially deals with control of a.c. power at ___________.

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Match List-I with List-II and select the correct answer using the options given below: List-I (Load impedance) List-II (Value of Reflection Coefficient) a. Short circuit 1. 0 b. Open Circuit 2. -1 c. Line characteristic impedance 3. +1 d. 2 × line characteristic impedance 4. $$ + \frac{1}{3}$$ Which semiconductor device behaves like two SCRs? The feedback topology in the amplifier circuit (the base bias circuit is not shown for simplicity) in the figure is A two branch parallel circuit has a 20 Ω resistance and 1 H inductance in one branch and a 100 µF capacitor in the second branch. It is fed from 100 V ac supply, at resonance, the input impedance of the circuit is In an op-amp, if the feedback voltage is reduced by connecting a voltage divider at the output, which of the following will happen? 1. Input impedance increases 2. Output impedance reduces 3. Overall gain increases