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A voltage source Vs = Vm sinωt is connected in series with a resistance R and an SCR. At some firing angle delay of α a positive gate pulse is applied to the SCR which turns on the SCR. Considering ideal conditions, at the instant α the voltage at the resistor terminals Vo

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A voltage source Vs = Vm sinωt is connected in series with a resistance R and an SCR. At some firing angle delay of α a positive gate pulse is applied to the SCR which turns on the SCR. Considering ideal conditions, at the instant α the voltage at the resistor terminals Vo

(a) falls to zero

(b) falls to –Vm sin α

(c) rises to Vm sin α

(d) rises to Vm sin ωt

I got this question in an internship interview.

My question is from Single-Phase HW AC-DC-1 topic in chapter Converters of Power Electronics

1 Answer

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by (45.1k points)
The correct choice is (c) rises to Vm sin α

Explanation: At the firing angle, the SCR turns on and thus the resistor or load R is connected to the source.

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