A drawback of replacing circuit boards one at a time to isolate a fault is ________.
A) an external problem may cause the replacement boards to fail as well
B) it cannot isolate multiple faults in a system
C) it requires keeping duplicates of all the circuit boards in a system
D) All of the above
Question 2
This device is often used as an electronic switch in many applications
A) SCR B) back-to-back diode
C) SPST D) SPDT