Fundamentals of Electricity and Electronics
The purpose of providing a space underneath the plates in a lead acid battery's cell container is to
prevent sediment buildup from contacting the plates and causing a short circuit.
A wing with a very high aspect ratio (in comparison with a low aspect ratio wing) will have
a low stall speed.
If a radial engine has been shut down for more than 30 minutes, the propeller should be rotated through at least two revolutions to
check for hydraulic lock.
What is the maximum duration of a temporary mechanic certificate?
120 days
If dye penetrant inspection indications are not sharp and clear, the most probable cause is that the part
was not thoroughly washed before the developer was applied.
How may magnesium engine parts be cleaned?
Wash with a commercial solvent, decarbonize, and scrape or grit blast.
Typical application for zener diodes is as
voltage regulators.
The speed of sound in the atmosphere
changes with a change in temperature.
How are aviation fuels which possess greater antiknock qualities than 100 octane, classified?
By performance numbers.
Under the Federal Aviation Regulations, an aviation maintenance technician is required to perform maintenance on an aircraft so that it
is at least equal to its original or properly altered condition
One of the main advantages of Hi-Lok type fasteners over earlier generations is that
they can be installed with ordinary hand tools.
What may be used to remove corrosion from highly stressed steel surfaces?
Fine grit aluminum oxide.
A thermal switch, or thermal protector, as used in an electric motor, is designed to
open the circuit in order to allow cooling of the motor.
The purpose of aircraft wing dihedral is to
increase lateral stability.
When approaching the front of an idling jet engine, the hazard area extends forward of the engine approximately
25 feet.
14 CFR part 65 subpart D contains information for the certification of
mechanics
What tool is generally used to set a divider to an exact dimension?
Machinist scale.
A correct use for acetone is to
remove grease from fabric.
What determines the amount of current which will flow through a battery while it is being charged by a constant voltage source?
The state of charge of the battery.
If the temperature of a confined liquid is held constant and its pressure is tripled, the volume will
remain the same.
When taxiing an airplane with a quartering tailwind, the elevators and
upwind aileron should be held in the down position.
Who may perform the work activities required for a major repair or alteration to an aileron?
Any certified mechanic with an airframe rating, but the work must be signed off for return to service by an IA.
A bolt with a single raised dash on the head is classified as an
AN corrosion resistant steel bolt.
If masking tape is applied to an aircraft such as for trim spraying, and is left on for several days and/or exposed to heat, it is likely that the tape will
cure to the finish and be very difficult to remove.
What schematic symbol represents a current limiter?
Two triangles pointing to each other with a line on both sides of the triangles.
Newton's Second Law of Motion, generally termed the, "Law of Momentum", states:
Acceleration is produced when a force acts on a mass. The greater the mass, the greater the amount of force needed.
Characteristics of detonation are
rapid rise in cylinder pressure, excessive cylinder head temperature, and a decrease in engine power.
The replacement of a damaged engine mount with a new identical engine mount purchased from the aircraft manufacturer is considered a
minor repair.
In examining and evaluating a welded joint, a mechanic should be familiar with
likely ambient exposure conditions and intended use of the part, along with type of weld and original part material composition
What is likely to occur if hydrated wash primer is applied to unpainted aluminum and then about 30 to 40 minutes later a finish topcoat, when the humidity is low?
A glossy, blush-free finish.
In an AC circuit, the effective voltage is
less than the maximum instantaneous voltage.
If two actuating cylinders which have the same cross sectional area but different lengths of stroke are connected to the same source of hydraulic pressure, they will exert
equal amounts of force and will move at the same rate of speed.
Characteristics of aviation gasoline are
high heat value, high volatility.
What is the normal duration of a mechanic certificate with airframe and/or powerplant ratings?
Until surrendered, suspended, or revoked.
When a mechanical force is repeatedly applied to most metals at room temperature, such as rolling, hammering, or bending, the metals become
cold worked, strain or work hardened
What type of corrosion may attack the grain boundaries of aluminum alloys when the heat treatment process has been improperly accomplished?
Intergranular