Part 1, Part 2, Part 3, Part 4, Part 5, Part 6, Part 7, Part 8, Part 5
What do the transistors in a 555 timer do?
Act as switches
What flight control allows the aircraft to roll?
Aileron
ESD is negligible provided what condition exists?
All electrical/electronic structures are properly bonded
When installing equipment in aircraft, what references do you use?
All of the above (approved flight manual, STCs, aircraft service or maintenance manual)
Most accidents are caused by what?
All of the above (unsafe acts of individuals, using improper parts, improper equipment installation)
When should a person stop administering mouth to mouth resuscitation/CPR?
All of the above (when the person administering COR becomes physically tired, when the person becomes conscious, when medical help arrives)
The amplifier's class of operation is determined by what?
Amount of forward bias
What parts of a relay comprise the Secondary (Controlled) Circuit?
Armature, contacts, and spring
Transformers are considered what kind of filter?
Band pass
An aircraft in flight; is the pressure on the wing greatest on the top or bottom?
Bottom
If the capacitor value in a filter (power supply rectifier) is increased, the AC ripple effect will (T=RC):
Decrease
If the forward bias is increased in an NPN transistor the resistance will
Decrease
If the volts across a capacitor is decreased, the stored voltage will?
Decrease
The "negative temperature coefficient" of a thermistor means that as temperature increases, resistance will do what?
Decrease
Wire has a gauge starting at 1 and goes to 40. Does the cross-section increase or decrease with a larger American Wire Gauge (AWG) number?
Decrease
What happens to wire resistance if the cross-section (area) increases
Decreases
Using the swamping resistor of thermal stability, what type of feedback is developed to control the amplifier?
Degenerative
What type of amplifier coupling is used that can amplify DC voltages as well as AC signals?
Direct
What are some causes of ESD?
Dry conditions (0-20% humidity rate) or poor bonding
Unless otherwise stated, any values of AC current or voltage in a circuit are assumed to be:
Effective (RMS) values
How do you clean corrosion from aluminum?
Emery cloth, aluminum wool
When different rated capacitors are connected in parallel in a circuit, the total capacitance is:
Equal to the sum of all the capacitors
When inductors are connected in series in a circuit, the total inductance is:
Equal to the sum of the individual inductors
The astable multivibrator is a:
Free running oscillator
The common base amplifier has a voltage gain _______ than one, but a current gain _______ than one.
Greater, less
When the J-K flip-flop input is triggered (toggle mode), what is the output frequency?
Half of the input
What does the phrase "cradle to grave" refer to?
Hazardous waste management programs
Which of the following devices is used to dissipate heat into the air?
Heat sink
What would a DMM read when testing a capacitor?
High impedance
Is hysteresis loss greater at higher or lower frequency?
Higher
What is the leading cause of accidents?
Human error
The basic requirements for sustaining oscillations in an oscillator are a power supply, FDD, amplifier, and ____.
Regenerative feedback
If you notice a person has a hearing injury or noise fatigue, what should you do first?
Remove them from the noisy area
What must you do before giving first aid to an electrical shock victim?
Remove victim from the live circuit, disconnect power from the circuit
What must be done to a torque wrench when finished?
Reset to the minimum setting
What is the most common type of fuselage design?
Semi-monocoque
What type of waveform is produced by a sinusoidal oscillator?
Sine wave
What type of output waveform is produced by an astable multivibrator?
Square wave or rectangular
What is the combination of horizontal stabilizer and an elevator called?
Stabilator
What do flip-flops do? (When used in Static RAM)
Store bits of data (1 bit per flip-flop)
When testing a diode, infinite resistance is measured in both directions. What is the problem?
The diode is open
The interchange of energy between the inductor and capacitor in a tank circuit is called?
The flywheel effect
What distinguishes a solenoid from a basic relay?
The plunger (armature) pulled into the coil
What part of a basic relay returns the armature to its de-energized position?
The spring
What does it mean if there is no 4th band on a resistor?
+/- 20% tolerance
What is 250,000 written in scientific notation?
2.5 x 10^5
What rate of humidity is conducive to the creation of ESD conditions?
0-20%
What should be removed at preflight?
Red streamers, covers, plugs, anything that states "remove before flight"
What is the resistance of normally closed contacts when the relay is de-energized?
0Ω/short
If the fourth band on a resistor is silver, what is the tolerance?
10%
How many watts is considered an RF danger?
1000 watts
Aircraft wire is normally rated at what voltage?
115VAC
In a common collector amplifier degenerative feedback is how many degrees out of phase with the input signal?
180 degrees
How many time constants does it take for a capacitor to be approximately 100% fully charged?
5
How many ohms is the aircraft radio impedance? (AKA Surge Impedance)
50Ω
What ohmic value of impedance are aviation transmission line (antennas, coax)?
50Ω
If the positive alteration of a square wave is 100 μsec in duration, then the PRF is
5KHz
What percentage of the applied voltage will the capacitor be at after one time constant?
63.2%
What does a filter in an electrical circuit consist of?
A capacitor and an inductor
What is the term for the outside shape or curvature of the wing?
Camber
What wing structure has internal bracing (spars)?
Cantilever
What is the international symbol for current?
Capital letter "I"
Who is responsible for providing an (M)SDS with chemicals?
Chemical manufacturer
What parts of a relay comprise the Primary (Control) Circuit
Core and coil
What is the flow of electrons through a conductor called?
Current
In a 1/4λ antenna, if a capacitor is added in series (to tune the antenna) what would happen to frequency?
Increase
What happens to wire resistance if the length is increased?
Increases
The opposition offered by a coil to the flow of alternating current is called what?
Inductive reactance
How do capacitors behave with frequency changes?
Infinite ohms or an open for low frequency and zero ohms or a short for high frequency
What will a DMM read if a fuse is broken?
Infinite resistance/"OL" (Outside Limits)
The monostable multivibrator output PRF is determined by the:
Input trigger frequency
What type of corrosion attacks the grain boundaries of metal?
Intergranular corrosion
What is the most commonly used type of flip flop?
J-K
When reading the resistance of a discharged capacitor it reads a constant 40 ohms. What is the problem?
Leaky capacitor
What is the "hand rule" for magnetic induction in generators?
Left hand rule
Is effective voltage in an AC circuit greater or less than the maximum instantaneous voltage?
Less than
When two or more inductors of different inductance are connected in parallel in a circuit, the total inductance is:
Less than the inductance of the lowest rated inductor
In an AC circuit, the effective voltage is:
Less than the maximum instantaneous voltage
When using a Digital Multimeter (DMM) or Ohmmeter to test a forward biased BJT emitter to base junction, what will the resistance be?
Low
If the secondary winding of a transformer is partially shorted, what will the voltage be?
Lower than normal voltage
How do you move elevators?
Move the yoke forward and backward
The basis for transformer operation in the use of alternating current is called what?
Mutual inductance
Which type of tester supplies it's own power?
Ohmmeter
What type of corrosion has a white powder type look to it?
Pitting
If the current in the diodes of an AC rectifier is reversed, what will happen to the output waveform?
Polarity is reversed
What happens if you connect the diode backwards in a full wave bridge rectifier?
Polarity will be reversed
Why is stainless steel safety wire used with steel bolts?
Prevent dissimilar metal corrosion
Which is the safest way to use a wrench, by pushing or pulling?
Pulling
What converts AC to DC?
Rectifiers
What maintenance practice is best for Foreign Object Damage (FOD) prevention?
Tool management
True/False: A transistor that acts as an open or is in cut-off means Vce = Vcc
True
True/False: The gold color band is never used as the first number on a resistor?
True
How many paths of current are required for a holding relay coil?
Two
If you add a parallel leg (resistor) in a circuit, what changes will happen?
Voltage remains the same, resistance decreases, current increases
If your output voltage is 0V when troubleshooting a circuit, what would you check input voltage with?
Voltmeter
Which type of diagram will tell the size of an electrical wire?
Wiring diagram
Can you use 0.032" safety wire with a 0.045" hole?
Yes
Is it ok to use the single strand safety wire method for electrical connections?
Yes
Current of 50 millamps can cause what?
asphyxiation, heart failure, and death
What principle do transformers operate on?
mutual inductance