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What is the need of rectification in regulated power supply? Short

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Name the semiconductor device that can be used to regulate an irregulation dc power supply. With the help of I-V characteristics of this device, explain its working.

The applied input a.c. to a half wave rectifier is 120 watt. The d.c. output is 50 watt. What is the rectification effeciency and power effeciency?

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In a half wave rectifier output is taken across a 90 ohm load resistor. If the resistance of diode in forward biased condition is 10 ohm , the efficiency of rectification of ac power into dc power is.

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A half wave rectifier provides DC output power of 30 W when 100 W AC power is supplied to it what will be the rectification efficiency and power efficiency