(AD) Aviation Machinist Mate Week 2 Quiz
with complete solution
Electricity - -The physical phenomena arising from the existence and interaction of
an electrical charge
-Voltage / Electromotive Force (EMF) - -The amount of force being applied to a
circuit to produce an electron flow
-Amperage / Current Flow - -The quantity of electricity flowing through the circuit
-Resistance - -The opposition to the flow of electrons offered by a device or
material
-Ohms - -The measurement of resistance to current flow
-Watt - -The measurement of electrical work done
-Forms of Electricity - -Static and Dynamic
-Static Electricity - -(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 - -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 - -Mechanical, Chemical, Thermal, and
Pressure
-Mechanical - -Produced by rotating a magnetic field through another magnetic
field
Ex: A Grass Cutter
-Chemical - -Produced by surrounding two or metallic plates with a chemical
electrolyte
Ex: A Battery
-Thermal - -Produced by joining two dissimilar metals and applying heat
Ex: Thermocouple
, -Pressure - -Produced by applying pressure to quartz, which will produce an
electron flow
Ex: A Watch
-Types of Electricity - -AC and DC
-Direct Current (DC) - -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) - -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 - -Multimeter
-Multimeter Test Leads - -Red lead = Positive and Black lead = Negative
-Multimeter Digital Display Features - -Power Up, Overload Indication (OL), and Low
Battery Indicator
-Power Up - -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) - -Indicates input is too large to display
-Low Battery Indicator - -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 - -Engine Speed Indicating
System, Engine Temperature Indicating System, Fuel Flow Indicating System, Oil
Pressure Indicating System and Engine Fire Detection System
-Engine Speed Indicating System's Components - -Tachometer (RPM) Indicator and
Tachometer Generator
-Tachometer (RPM) Indicator - -Indicates engine compressor rotor RPM in percent. It
is located in the flight station / cockpit
-Tachometer generator - -(1) Mounted and splined to the accessory gearbox
(2) Creates an electrical reference signal that represents the rotational speed of the
engine compressor
(3) The reference signal is transmitted to the tachometer (RPM) indicator and is
read as percent of compressor RPM
with complete solution
Electricity - -The physical phenomena arising from the existence and interaction of
an electrical charge
-Voltage / Electromotive Force (EMF) - -The amount of force being applied to a
circuit to produce an electron flow
-Amperage / Current Flow - -The quantity of electricity flowing through the circuit
-Resistance - -The opposition to the flow of electrons offered by a device or
material
-Ohms - -The measurement of resistance to current flow
-Watt - -The measurement of electrical work done
-Forms of Electricity - -Static and Dynamic
-Static Electricity - -(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 - -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 - -Mechanical, Chemical, Thermal, and
Pressure
-Mechanical - -Produced by rotating a magnetic field through another magnetic
field
Ex: A Grass Cutter
-Chemical - -Produced by surrounding two or metallic plates with a chemical
electrolyte
Ex: A Battery
-Thermal - -Produced by joining two dissimilar metals and applying heat
Ex: Thermocouple
, -Pressure - -Produced by applying pressure to quartz, which will produce an
electron flow
Ex: A Watch
-Types of Electricity - -AC and DC
-Direct Current (DC) - -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) - -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 - -Multimeter
-Multimeter Test Leads - -Red lead = Positive and Black lead = Negative
-Multimeter Digital Display Features - -Power Up, Overload Indication (OL), and Low
Battery Indicator
-Power Up - -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) - -Indicates input is too large to display
-Low Battery Indicator - -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 - -Engine Speed Indicating
System, Engine Temperature Indicating System, Fuel Flow Indicating System, Oil
Pressure Indicating System and Engine Fire Detection System
-Engine Speed Indicating System's Components - -Tachometer (RPM) Indicator and
Tachometer Generator
-Tachometer (RPM) Indicator - -Indicates engine compressor rotor RPM in percent. It
is located in the flight station / cockpit
-Tachometer generator - -(1) Mounted and splined to the accessory gearbox
(2) Creates an electrical reference signal that represents the rotational speed of the
engine compressor
(3) The reference signal is transmitted to the tachometer (RPM) indicator and is
read as percent of compressor RPM
