Amateur Radio Exam

Amateur Extra Class Exam Question Pool Review

Question E5I13:

What characteristic of optoisolators makes them suitable for use with a triac to form the solid-state equivalent of a mechanical relay for a 120 V AC household circuit?

Answers:

A.Optoisolators provide a low impedance link between a control circuit and a power circuit

B.Optoisolators provide impedance matching between the control circuit and power circuit

C.Optoisolators provide a very high degree of electrical isolation between a control circuit and a power circuit

D.Optoisolators eliminate (isolate) the effects of reflected light in the control circuit

Correct answer is:C