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WorksheetsB2OCT23B74
Total questions: 112
Worksheet time: 56mins
Why is it essential to calibrate equipment used in airborne avionics maintenance?
To ensure it matches the manufacturer's recommendation.
To verify the equipment is in good condition.
To guarantee equipment safety.
All of the above.
Before using test equipment, technicians should ensure:
It is within its service life.
It has been used less than ten times.
It matches the manufacturer's recommendation or its equivalent.
It has been approved by a supervisor.
The industry standard for calibration intervals is typically:
6 months.
1 year.
2 years.
It varies depending on the equipment.
What do logic circuits primarily have?
Multiple states including on, off, and neutral.
Only one state which is on.
Two states: high or low.
Four states: high, low, medium, and off.
What is a primary use of a logic probe in troubleshooting digital integrated logic circuits?
To detect changes in temperature.
To compare with a known functional IC
To simplify troubleshooting of logic levels in digital circuits.
To measure resistance.
Ideal characteristics of a logic probe include:
Heavyweight.
Detects steady logic levels.
Requires external power source.
Can only detect low-speed transient pulses.
What does a red LED indicate on a basic logic probe?
Low
Open
High
Pulse
Pins 7, 8, 9, 12, and 13 of the CD4011 IC are connected to:
The positive supply rail.
The ground.
The negative supply rail.
An external battery.
An oscilloscope is primarily used to:
Measure resistance of electrical signals.
Analyze audio frequencies.
Display the shape of video pulses at test points.
Convert electrical signals to mechanical movements.
Understanding one oscilloscope helps in understanding others because:
All oscilloscopes have the same size and weight.
All oscilloscopes operate fundamentally the same way.
All oscilloscopes are made by the same manufacturer.
All oscilloscopes have the same price.
Which display is used in a cathode ray oscilloscope (CRO)?
LCD screen
Fluorescent screen
OLED display
Digital screen
To measure the voltage signal of an oscilloscope, one connects:
A DC voltmeter in series with the signal generator's terminals.
An AC voltmeter in series with the signal generator's terminals.
An AC voltmeter in parallel across the signal generator’s terminals.
A resistance meter across the signal generator's terminals.
Decade boxes are assemblies of precision:
Transistors
Diodes
Resistors, coils, or capacitors
Integrated circuits
How are the desired values set in a Decade Box?
By adjusting a single knob.
By using a 10-position selector switch for each section.
By soldering components together.
By adjusting internal settings.
If you have a Decade Resistance Box with four sections (dials), which of the following values can you NOT set directly?
1,111 Ω
9,999 Ω
11,111 Ω
999 Ω
In a Decade Resistance Box, resistors in each section:
Have varying values depending on the switch position.
Are all of the same value such as 1, 10, 100, 1000, etc.
Increase in value by a factor of 2.
Decrease in value by a factor of 0.5.
What is the primary purpose of signal generators?
Provide a DC source for electronics.
Test and align transmitters and receivers.
Store energy for later use.
Convert mechanical energy to electrical energy.
The function of a signal generator is to:
Produce AC of desired frequencies and amplitudes.
Amplify radio frequencies.
Convert audio signals to digital signals.
Store frequency data.
The FG-30 Signal Generator is most suitable for:
Home appliances.
Avionics workshops.
Car audio systems.
Industrial machinery.
What feature does the FG-30 Signal Generator offer?
Frequency range of 10 Hz-10 MHz.
Five output waveforms.
Pulse generator.
Built-in oscilloscope.
To trace a test signal's progress from a signal generator, one can use:
A multimeter only.
A resistor.
An oscilloscope or electronic voltmeters.
A capacitor.
Why do many signal generators have attenuators?
To amplify the signal.
To store energy.
To regulate output signal voltage.
To convert AC to DC.
Which of the following is NOT a type of signal generator based on the given information?
AC generator.
RF generator.
Video signal generator.
Frequency-modulated RF generator.
Which of the following is a feature of the FG-30 Signal Generator?
It has a frequency range up to 10 MHz.
It offers only four output waveforms.
It is particularly high-cost.
Suitable for electronics, education, production, and R&D labs.
Signal generators provide standard sources of AC energy primarily in:
Only audio frequency (AF).
Only radio frequency (RF).
Both audio frequency (AF) and radio frequency (RF).
Neither audio frequency (AF) nor radio frequency (RF).
Which of the following is NOT a main section of an RF Signal Generator?
Oscillator circuit
Modulator
Amplifier
Output control circuit
The primary purpose of the metal shielding in an RF Signal Generator is to:
Improve the aesthetics of the generator.
Cool the generator.
Prevent unintended signal interference.
Enhance the modulation capability.
In the oscillator stage of an RF Signal Generator, for low frequencies, which components form the resonating circuit?
Transistors and diodes
Coils and variable capacitor
Resistors and capacitors
Transistors and coils
The modulating circuit in an RF Signal Generator:
Only allows for unmodulated signals.
Produces video voltage only.
Produces audio (or video) voltage to superimpose on the RF signal.
Can only derive modulation from an internal source.
What types of modulation can an RF Signal Generator produce?
Only sine wave modulation.
Sine wave, square wave, and pulse of varying durations.
Only pulse modulation with fixed rates and widths
Continuous wave modulation.
The output of an RF Signal Generator usually includes:
A frequency adjuster.
A calibrated attenuator and an output-level meter.
A frequency multiplier.
A modulation adjuster.
The primary role of the attenuator in an RF Signal Generator is to:
Amplify the output signal.
Convert RF to AF.
Select the amount of output.
Modulate the RF signal.
The control knob of the attenuator in an RF Signal Generator is calibrated in:
Hertz
Watts
Decibels
Microvolts
In an RF Signal Generator, adjusting the attenuator and reading the meter allows for:**
a) Determining the frequency of the output.
b) Precise output measurements in microvolts.
c) Modulating the output.
d) Adjusting the modulation rate.
Determining the frequency of the output.
Precise output measurements in microvolts.
Modulating the output.
Adjusting the modulation rate.
The primary purpose of an RF Directional Wattmeter is to measure:
Frequency of the RF signal.
Impedance of the coaxial line.
Forward or reflected power in coaxial lines.
Voltage across the coaxial lines.
Which power indicates the energy traveling back to the transmitter due to impedance mismatch?
Forward power
Reflected power
Actual power
Standing power
VSWR is an indicator of:
Frequency of RF signal.
Forward power.
Impedance match.
Amplitude of RF signal.
A 1:1 VSWR implies:
Maximum standing wave is thrice the minimum.
There is a major impedance mismatch.
Perfect impedance match.
There is half impedance mismatch.
Which of the following is NOT a feature of the Bird Model 43 Wattmeter?
Suitable for pulse modulation.
Uses Bird Plug-In Element for measurements.
Storage for two extra elements on the wattmeter's sides.
Direct readings in watts with expanded scale.
To measure reflected power using the Bird Model 43 Wattmeter, the plug-in element should be rotated towards:
The RF source.
The antenna.
The load.
The modulator.
The Standing Wave Ratio (SWR) is calculated from:
Actual and reflected power measurements.
Forward and reflected power measurements.
Forward power and impedance.
Reflected power and impedance.
In the Bird Model 43 Wattmeter, what produces the current in the coupling circuit?
Modulating waves.
Reflected waves.
Standing waves.
Travelling waves.
For troubleshooting using the Bird Model 43 Wattmeter, which tool is useful when ensuring it has the correct rating?
Resonator
Oscillator
Dummy loads
Amplifier
What is the primary function of an attenuator?
Amplify the amplitude of a signal.
Reduce the amplitude or power of a signal.
Change the frequency of a signal.
Store and release signals.
How does an attenuator differ from an amplifier?
Attenuator distorts the signal; amplifier does not.
Amplifier reduces signal power; attenuator increases it.
Amplifier provides gain; attenuator provides loss.
There's no significant difference between the two.
RF attenuators specifically reduce:
Amplitude in watts.
RF signals by a predetermined amount in decibels.
Voltage in volts.
Frequency in hertz.
A fixed attenuator:
Allows adjustable attenuation levels.
Is used for consistent reduction in power.
Amplifies the signal.
Is not a passive device.
One use of attenuators is to:
Amplify unequal signals in transmission lines.
Balance out transmission lines with unequal signal levels.
Increase the dynamic range of devices.
Directly measure high frequencies.
The attenuator probe schematic represents a:
5:1 voltage divider.
10:1 voltage divider.
10 MΩ probe resistor.
9-MΩ oscilloscope resistor.
When using the attenuator probe, what becomes the oscilloscope input resistance?
9 MΩ
1 MΩ
10 MΩ
10 Ω
Why would you use an attenuator probe over a 1:1 probe?
For amplifying signals.
It causes more circuit loading.
For reduced circuit loading.
For lower input impedance.
Adjusting the probe compensating capacitor (C1) is particularly important for:
Low-frequency waveforms.
Static signals.
High-frequency or fast-rising waveforms.
Consistent signal levels.
If an attenuator probe has an impedance equalizer, its primary function is to:
Increase the signal power.
Match the probe with the oscilloscope.
Reduce the signal's frequency.
Act as a voltage divider.
What is the primary purpose of a Time-Domain Reflectometer (TDR)?
Amplifying signals.
Transmitting radio signals.
Measuring cable length and locating faults.
Testing avionics systems.
Which of the following cables is NOT compatible with a TDR?
Twisted pair
Parallel conductors
Fiber optic
Coaxial
Reflections in TDR occur due to:
Known pulses transmitted.
Impedance changes in the cable.
Changes in the speed of light.
Twisted pair cables.
Which of the following can be identified by a TDR?
Signal amplitude
Cable conductivity
Avionics testing capability
Common transmission line problems
What is the IFR NAV-402AP Nav/Comm Test Set primarily used for?
Calibrating radio signals.
Measuring cable lengths.
Testing and calibrating avionics.
Adjusting TDR readings.
The IFR NAV-402AP Nav/Comm Test Set can function as a:
Bench tester only.
Ramp tester only.
Both a bench and ramp tester.
Neither bench nor ramp tester.
The IFR NAV-402AP Nav/Comm Test Set’s RF power meter can measure:
0–10 W and 0–10W
0–10 W and 0–100W
0–100 W and 0–1000W
0–1 W and 0–10W
Which feature does the IFR NAV-402AP Nav/Comm Test Set NOT have?
Signal generator for MKR, VOR, and COM systems.
VOR bearing selectable in 0.1° increments.
0 dBm external frequencies from 0.5 MHz to 200 MHz.
Integrated battery and charger.
For what systems does the IFR NAV-402AP Nav/Comm Test Set provide functional testing?
VOR, COM, and ILS only.
ILS, MKR, and VOR only.
VOR, ILS, COM, and MKR.
LOC-G/S and VOR only.
What does the MICHEL 2210 Nav/Comm Ramp Tester primarily provide?
Amplification of signals.
Test signals for navigational and communication systems.
Connection capabilities for avionic systems.
Signal modulation for converters.
The MICHEL 2210 Nav/Comm Ramp Tester signals can be:
Only radiated.
Only directly connected.
Either radiated or directly connected.
Neither radiated nor directly connected.
Which of the following features does the MICHEL 2210 NOT have?
VOR bearings calibrated in 5° increments.
Extended battery life.
Built-in antenna with adjustable length.
Crystal-controlled modulation frequencies.
The MICHEL 2210 Nav/Comm Ramp Tester replaces which model?
MICHEL 2100
IFR 4000
NC 2200
IFR 2200
Which of the following describes the IFR 4000 Nav/Comm Test Set?
Bulky, lightweight, and weatherproof.
Compact, heavy, and weatherproof.
Compact, lightweight, and weatherproof.
Compact, lightweight, and non-weatherproof.
The IFR 4000 can simulate which of the following signals?
Only localiser.
Only VOR beacon.
Both localiser and glideslope.
Only glideslope.
What is the size of the LCD display on the IFR 4000 Nav/Comm Test Set?
5-inch
5.5-inch
5.7-inch
6-inch
How long can the IFR 4000 operate on its internal battery before needing a recharge?
4 hours
6 hours
8 hours
10 hours
The IFR 4000 Nav/Comm Test Set allows for:
MKR simulation with only Middle Marker Tones.
Localiser DDM without any adjustment.
VOR beacon simulation without variable bearing.
Accurate assessment of VHF/UHF antenna or feeder SWR.
Which feature helps in reducing the total testing time in the IFR 4000 Nav/Comm Test Set?
Swept localiser DDM.
Guided Test capability.
Adjustable LCD display.
ARINC 596 Selective Calling Tones.
What is the primary purpose of the MICHEL 3300 Transponder Test Set?
To measure signal strength.
To test ATC transponders.
To intercept radio frequencies.
To generate velocity signals.
The interrogation range of MICHEL 3300 Transponder Test Set is:
More than 100 ft.
Exactly 100 ft.
Less than 100 ft.
Variable, depending on conditions.
For ramp testing, the interrogation signal of MICHEL 3300 has pulse groups (PGs) at a PRF of:
100 PG/s
200 PG/s
235 PG/s
300 PG/s
Each pulse group in the MICHEL 3300 Transponder Test Set consists of how many pulses?
One or two.
Two or three.
Three or four.
Four or five.
The Distance Measuring Equipment (DME) is designed to:
Interrogate signals.
Test ATC transponder systems.
Decode radio signals.
Amplify signals.
The DME range output maximum value is:
299 NM
399 NM
499 NM
599 NM
The accuracy of DME range output is:
0.05-NM
0.07-NM
0.09-NM
0.10-NM
The DME provides which type of distance information from a ground station?
Horizontal range distance.
Vertical range distance.
Slant range distance (line of sight)
Direct line distance.
How does the DME operate to determine distance?
Measures the strength of the signal from the aircraft.
Sends a continuous wave from the aircraft to a ground station.
Sends paired pulses from the aircraft to a ground station and back, measuring round-trip signal time.
Uses triangulation method with multiple ground stations.
The variable velocity outputs of DME have an accuracy of:
0.01%
0.02%
0.03%
0.04%
What is the primary purpose of Pitot-Static Test Sets?
To charge aircraft batteries.
To measure fuel levels in aircraft.
To test aircraft pitot and static systems.
To calibrate aircraft communication systems.
Which of the following is NOT a test conducted using Pitot-Static Test Sets?
Altitude indications.
Fuel consumption rate.
Airspeed indications.
Air Data Computer operation.
The Pitot/Static Tester ADTS 500 is described as:
A heavy-duty machine for permanent installations.
A desktop device for indoor use only.
A self-contained, portable tester for flight lines.
An aerial device used in-flight.
The ADTS 500's case lid serves what function?
Houses the main operating panel.
Contains a secondary battery.
Acts as an antenna for wireless connectivity.
Has storage for power supply cable, pitot, and static hoses.
Before conducting a Pitot/Static testing procedure, what must be ensured?
The aircraft's fuel tanks are full.
A mandatory entry for pitot/static leak check is documented.
The communication systems are turned off.
The aircraft windows are closed.
To familiarize oneself with the testing procedure, one should consult:
The pilot's operating manual.
The aircraft's communication manual.
The Aircraft Maintenance Manual (AMM).
The airport's safety guidelines.
What is a CAUTION mentioned in the provided information regarding pitot/static testing?
Ensure pitot heat is always on.
Always use tapes to block static ports.
Avoid using the mouth and lungs for pressure/suction.
Use sideways load on pitot heads.
Which statement is a WARNING related to the procedure?
Always keep the pitot heat on.
Sideways load on pitot heads is recommended.
Non-adherence can damage the pitot/static instruments.
Use only tape to block static ports.
When conducting tests, it's crucial to:
Use sideways load on pitot heads.
Ensure pitot heat is on and active.
Inspect entry, drain, and static holes or ports for blockages.
Only use tapes for blocking ports.
What should be documented if used during tests?
The number of pressure outlets.
The pressure rate change in feet per minute.
Any tape usage.
The number of solenoid valves.
What is the TT1000A designed to test?
Capacitance-type liquid gauging systems.
Fuel quality and grade.
Chromel-Alumel (CH-AL) turbine temperature measuring systems.
Aircraft communication systems.
What is one of the main features of the TT1000A turbine temperature tester?
Simulates the function of the compensator.
Measures capacitance values of tank units.
An automatic digital display to reduce testing time.
Tests using AC or DC power sources.
The TT1000A can measure system lead resistances from:
0 to 10 Ω.
0 to 25 Ω.
10 to 50 Ω.
50 to 100 Ω.
The Model PSD 60-1AF AC Field Calibration Unit is specifically designed to test:
Turbine temperature measuring systems.
Capacitance-type liquid gauging systems and components.
The quality of aviation fuel.
Aircraft navigation systems.
Which of the following is NOT a function of the Fuel Quantity Indication (FQI) Test Set?
Measures altitude indications.
Measures capacitance values of individual or sets of tank units.
Inserts capacitance values for functional calibration checks.
Measures insulation resistance of tank units and cabling.
What type of power sources are typically used for FQI test sets?
220 V AC at 50 Hz or 12 V DC.
115 V AC at 400 Hz or 28 V DC.
145 V AC at 60 Hz or 32 V DC.
100 V AC at 350 Hz or 24 V DC.
Before testing with the FQI test set, it's crucial to:
Set the fuel gauge to zero.
Use the largest possible test leads.
Ensure proper earthing of the test box.
Charge the aircraft batteries.
To ensure the correct operation and safety of the FQI test set, operators should:
Rely solely on their intuition.
Avoid using the device when it's raining.
Follow the operating instructions and refer to the Aircraft Maintenance Manual (AMM).
Only operate the test set on an empty fuel tank.
What does the TT1000A display thermocouple outputs in?
Fahrenheit.
Kelvin.
Celsius.
Rankine.
One of the primary goals of the TT1000A design is to:
Increase maintenance costs.
Simulate fuel gauging circuits.
Reduce maintenance time and cost.
Test the aircraft's communication systems.
What is the primary function of Loop Resistance Testers?
Measure temperature across a loop.
Measure resistance at two points within a loop.
Calculate the area of the loop.
Analyze the length of the loop.
If the resistance exceeds allowable values in a loop, what does it typically indicate?
Cable short circuit.
Corrosion in the path.
Overcurrent.
Weak battery.
Which of the following can cause corrosion?
Interaction of metal with Skydrol.
Exposure to sunlight.
Heat exposure.
Mechanical stress.
What is the effect of oxide formation between contact surfaces?
It reduces resistance.
It acts as a conductor.
It increases current flow.
It acts as an insulator.
When resistance in the loop reaches a particular level, what maintenance action may be required?
Painting the loop.
Replacing batteries.
Cleaning affected junctions or replacing cables.
Increasing the loop's diameter.
Why is loop resistance testing beneficial?
It's complex and requires multiple devices.
It calculates the power consumption of a loop.
It allows for simplicity in isolating cable loops.
It analyzes the chemical composition of the loop.
What happens to the electrical current flow over time as oxide restricts it?
The current flow remains constant.
The current flow increases.
The resistance decreases.
The resistance increases.
Corrosion in cable circuits mainly degrades what?
Electrical ground paths.
Electrical power paths.
Data transmission paths.
Audio signal paths
Which of the following is an advantage of Loop Resistance Testing?
Ability to change the loop's color.
Ability to measure currents and voltages across junctions.
Ability to detect sound frequencies.
Ability to change the loop's shape.
If left unattended, what can happen to an electrical junction affected by corrosion?
The junction can produce light.
The electrical current can become constant.
The junction can become magnetized.
The electrical junction can be completely interrupted.
