Aircraft Electronics Technician AET - NCATT

NCATT Aircraft Electronics Technician (AET) Study Guide
o Polarity of Connections—NPN and PNP transistors are not interchangeable
because of their opposite polarities
• Collector Base Junction
o Must be reverse-biased for a transistor to conduct current
• Collector Current
o Electrode from which conventional current leaves the transistor
o The collector collects the current
• Emitter Base Junction
o Must be forward-biased for a transistor to conduct current
• Emitter Current
o Electrode that compares with the cathode in an electron tube
o The emitter emits the current carriers
• Junction
o Point at which two materials are in contact with each other
• Proper Use and Installation
o See Limiter Circuits/Diodes
• Schematic Diagram and Symbols
o See Limiter Circuits/Diodes
20. Digital Numbering Systems
NCATT Level B
Outcome: A successful education or training outcome for this task/subject will produce an
individual who knows and can identify the relationship of basic facts and state general principles
about “Digital Numbering Systems”. The following is a minimum list of terms and task
associated with this subject.
Binary:
Individuals should be able to explain the use of the binary digital numbering system and practice
conversions with reference to the following terms:
• Binary Digit (bit)
o Each zero or one is a binary number
• Binary Numbering System (Binary Notation)
o Mathematical computation based on powers of two
o The binary numbering system is composed of two digits (1 and 0)
o Binary notation operates in Base 2
o Each digit in a binary number represents two bits
• Byte
o Consists of eight bits
• Conversions
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