1. For the circuit in Figure 1: a) Calculate the input and output power if the input signal results in a base current of 5 mA rms. b) Calculate the input power dissipated by the circuit if RB is changed to 1.5 kN. c) What maximum output power can be delivered by the circuit if RB is changed to 1.5 kQ?

A 60 Hz sinusoidal voltage is applied to an SCR full-wave rectifier. If the DC output voltage is 162 V and the firing angle of the SCR is 60 degrees, the peak voltage of the input sinusoidal would be: O A. 197 V O B. 228 V O C. Can't tell; need more information. O D. 340 V O E. None of the other choices are correct

You are an electrician working on an overhead crane. The crane uses a large electromagnet to pick up large metal pipes. The magnet must have a minimum of 200 VDC to operate properly. The crane has an AC source of 240 V. You are given four diodes that have a peak voltage rating of 400 V each. These diodes are to be used to form a bridge rectifier to convert the AC voltage into DC voltage. Is the voltage rating of the diodes sufficient? To the nearest volt, what will be the DC output voltage of the bridge rectifier?

Design the Clipper-Clamper circuit to perform the output waveform shown in figure below.

18. A dc-dc converter is to be built with the following specifications: Allowed dc input voltage range: +8 V to +18 V +24 V Output average voltage: Output voltage ripple: ±0.06 V maximum at rated load 300 W, resistive ±250 mA maximum at rated load 100 kHz Rated load: Input current ripple: Switching frequency: Common ground between input and output. a. Draw a circuit which can perform this function. b. What is the necessary range of duty ratio for each switch? c. Find circuit part values (R, L, and C) which will meet the stated specifications.

Sub:power electric

The input to a full-wave rectifier is 10 V AC (RMS). The load resistor is 10 ohms and rectifier losses are 4W. The power efficiency of the rectifier is: O A. 58 % O B. None of the other choices are correct O C. 100 % O D. 80 % O E. 67 %