Practice mode / Electrical Engineering Why are SCRs made of silicon? A Option A: Silicon has a smaller leakage current than germanium B Option B: Silicon has a larger leakage current than germanium C Option C: Silicon has a larger leakage voltage than germanium D Option D: Silicon has a smaller leakage voltage than germanium Correct answer A. Silicon has a smaller leakage current than germanium Explanation Silicon has a wider band gap than germanium, so its leakage current is much smaller, letting the SCR block high voltages and operate at higher temperatures. Show answer Report a problem Answer checked 11 October 2026 · How we write and check questions
Question 01 / Electrical Engineering How is the load connected in an SCR circuit? A Option A: In series with anode B Option B: Across cathode C Option C: In series with cathode D Option D: Across anode Correct answer A. In series with anode Show answer Open question
Question 02 / Electrical Engineering How can AC power in a load be controlled? A Option A: Three SCRs in series B Option B: Four SCRs in series C Option C: Two SCRs in series D Option D: Two SCRs in parallel opposition Correct answer D. Two SCRs in parallel opposition Show answer Open question
Question 03 / Electrical Engineering How many PN junctions does an SCR contain? A Option A: Four B Option B: Five C Option C: Three D Option D: Two Correct answer C. Three Show answer Open question
Question 04 / Electrical Engineering With which parameters can the switching function of semiconductor devices be characterised? A Option A: Duty ratio only B Option B: Duty ratio and frequency C Option C: Duty ratio, frequency and time delay D Option D: Frequency only Correct answer C. Duty ratio, frequency and time delay Show answer Open question
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