Question

exam lesson name: electricity and electronics
exam number: 700798rr
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question 9 of 20 :
select the best answer for the question.

1. which of the following accurately describes semiconductor diodes?

○ a. point - contact diodes are more likely to be used as rectifiers than junction diodes.
○ b. unlike junction diodes, point - contact diodes are enclosed in a suitable casing and have terminals for connecting them to a circuit.
○ c. junction diodes are preferred over point - contact diodes for most purposes.
○ d. unlike point - contact diodes, junction diodes use a point of metal wire in contact with a single wafer of p - type or n - type material.
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Explanation:

• Option A: Point - contact diodes have lower current - handling capacity and are less suitable for rectification compared to junction diodes, so A is wrong.
• Option B: Both point - contact and junction diodes are enclosed in casings with terminals for circuit connection, so B is wrong.
• Option C: Junction diodes have better performance in terms of current handling, stability, etc., and are preferred for most applications over point - contact diodes, so C is correct.
• Option D: Point - contact diodes use a metal wire point in contact with a semiconductor wafer, while junction diodes are formed by a PN junction, so D has the description reversed.

Answer:

C. Junction diodes are preferred over point - contact diodes for most purposes.