(AD) Aviation Machinist Mate Week 2
UPDATED Exam Questions and
CORRECT Answers
Electricity - Correct Answer- The physical phenomena arising from the existence and
interaction of an electrical charge
Voltage / Electromotive Force (EMF) - Correct Answer- The amount of force being applied to
...
Electricity - Correct Answer- The physical phenomena arising from the existence and
interaction of an electrical charge
Voltage / Electromotive Force (EMF) - Correct Answer- The amount of force being applied to
a circuit to produce an electron flow
Amperage / Current Flow - Correct Answer- The quantity of electricity flowing through the
circuit
Resistance - Correct Answer- The opposition to the flow of electrons offered by a device or
material
Ohms - Correct Answer- The measurement of resistance to current flow
Watt - Correct Answer- The measurement of electrical work done
Forms of Electricity - Correct Answer- Static and Dynamic
Static Electricity - Correct Answer- (1) Electricity at rest
(2) Begins with a build up of either a positive or negative electron charge. If two negative
charges or two positive charges are brought close together, the objects that hold that charge
repel each other. If a positive charge is brought within close proximity of a negative charge,
the two objects attract each other
(3) Static electricity is produced by friction and is not easily measured nor is it controllable or
usable
,Dynamic Electricity - Correct Answer- A practical form of current flow that is used in
everyday life. This form of electricity is easily produced, measured, and controlled
Methods of Producing Dynamic Electricity - Correct Answer- Mechanical, Chemical,
Thermal, and Pressure
Mechanical - Correct Answer- Produced by rotating a magnetic field through another
magnetic field
Ex: A Grass Cutter
Chemical - Correct Answer- Produced by surrounding two or metallic plates with a chemical
electrolyte
Ex: A Battery
Thermal - Correct Answer- Produced by joining two dissimilar metals and applying heat
Ex: Thermocouple
Pressure - Correct Answer- Produced by applying pressure to quartz, which will produce an
electron flow
Ex: A Watch
Types of Electricity - Correct Answer- AC and DC
Direct Current (DC) - Correct Answer- Current that is a steady flow in one direction only. It
is produced mechanically by a DC generator, or chemically by a battery
Ex: A Flashlight
, Alternating Current (AC) - Correct Answer- Current flow that reverses direction at specific
intervals, defined as Hertz / Cycles. It is produced mechanically by an AC generator
Ex: A TV Screen
Electrical Test Equipment - Correct Answer- Multimeter
Multimeter Test Leads - Correct Answer- Red lead = Positive and Black lead = Negative
Multimeter Digital Display Features - Correct Answer- Power Up, Overload Indication (OL),
and Low Battery Indicator
Power Up - Correct Answer- All segments appear while the instrument performs a self-test.
At the end of the test, meter will chirp once indicating that it is ready for use
Overload Indication (OL) - Correct Answer- Indicates input is too large to display
Low Battery Indicator - Correct Answer- Appears when approximately 100 hours of life
remain. If left on, the meter will go to standby mode after one hour to save the battery
Systems / Components of the Engine Electrical System - Correct Answer- Engine Speed
Indicating System, Engine Temperature Indicating System, Fuel Flow Indicating System, Oil
Pressure Indicating System and Engine Fire Detection System
Tachometer (RPM) Indicator - Correct Answer- Indicates engine compressor rotor RPM in
percent. It is located in the flight station / cockpit
Tachometer generator - Correct Answer- (1) Mounted and splined to the accessory gearbox
(2) Creates an electrical reference signal that represents the rotational speed of the engine
compressor
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