Identify the correct circuit diagrams for the normal operation from… | MHT CET 2023 (11 May, Shift 1)

Q49MHT CET 2023 · 11 MAY · SHIFT 1Medium

Special Purpose Diodes

Identify the correct circuit diagrams for the normal operation from the following.

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Answer: (d)

Arrows pointing into the diode mean a photodiode, which must be reverse biased. Arrows pointing out mean an LED, which must be forward biased.
(A): photodiode with + terminal at the anode, forward biased, wrong. (B): photodiode with − terminal at the anode, reverse biased, correct.
(C): LED with − terminal at the anode, reverse biased, wrong. (D): LED with + terminal at the anode, forward biased, correct.
So the answer is (d) (B), (D).

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