The turn on time of an SCR with inductive load is 20 µs. The pulse train frequency is 2.5 KHz with a mark/space ratio of 1/10, and then SCR will ______(a) Turn On(b) Not turn on(c) Turn on if inductance is removed.(d) Turn on if pulse frequency is increased to two timesI got this question in a job interview.This intriguing question originated from Power BJTs topic in division Differential and Multistage Amplifiers of Electronic Devices & Circuits

The turn on time of an SCR with inductive load is 20 µs. The pulse tr

1.	The turn on time of an SCR with inductive load is 20 µs. The pulse train frequency is 2.5 KHz with a mark/space ratio of 1/10, and then SCR will ______(a) Turn On(b) Not turn on(c) Turn on if inductance is removed.(d) Turn on if pulse frequency is increased to two timesI got this question in a job interview.This intriguing question originated from Power BJTs topic in division Differential and Multistage Amplifiers of Electronic Devices & Circuits
Answer» The correct ANSWER is (a) Turn On To elaborate: Pulse repetition rate (PRR) = 1/(2.5 – 10^3) = 0.4 ms = 400 µs. Mark/space RATIO = 1/10. Pulse width = 400/11 = 36.4 µs. The SCR will ‘turn on’ as the pulse width is greater than SCR turn on time.

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