Electronics (Mike Jaroch)

A circuit breaker that will open a circuit even if the operating mechanism is held in the ON position [3].

Acceptor impurities containing only three valence electrons [7].

The portion of the atmosphere, closest to the earth's surface, where all weather phenomena take place [10].

The propagation of radio waves in the troposphere by means of scatter [10].

Signal lights used to aid maintenance personnel in locating troubles quickly
[15].

Tables of trouble symptoms and probable causes, furnished by many manufacturers to help technicians isolate problems [15].

The process of locating and diagnosing faults in equipment by means of
systematic checking or analysis [3] [15] [16].

(BOTTOM)—The peak of the negative alternation (maximum value below the line) of a sine wave [10].

Angle between a target and true north measured clockwise in the horizontal plane [18].

Geographic north [18].