Electronic Circuit Analysis

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Questions and Answers

What is the primary function of a time-domain reflectometer (TDR) in aircraft system testing?

To amplify weak signals in transmission lines

To measure the velocity of propagation of signals in cables

To locate faults and measure cable lengths in various types of cables (correct)

To test the insulation of cables for defects

What happens to the pulses transmitted by a TDR when they reach impedance changes in a cable?

They are absorbed by the cable

They are transmitted to the other end of the cable

They are amplified by the cable

They are reflected back to the TDR (correct)

What determines the speed at which pulses travel along a cable?

The velocity of propagation of the cable (correct)

The type of cable used

The frequency of the signal

The amplitude of the transmitted pulses

What is the relationship between velocity of propagation (Vp) and wavelength (λ)?

Vp = λf Signup and view all the answers

What is the purpose of a signal generator in electronic equipment maintenance?

To test and align transmitters and receivers Signup and view all the answers

What is the approximate speed of light in free space?

300,000,000 m/sec Signup and view all the answers

What is the frequency range of the FG-30 signal generator?

0.5 Hz–3 MHz Signup and view all the answers

What is the range of velocity of propagation in twisted pair cable as a percentage of the speed of light?

40-75% Signup and view all the answers

What is another term for the time-to-distance figure of velocity of propagation?

Propagation delay Signup and view all the answers

What is a common application of signal generators in the avionics workshop?

To test and troubleshoot electronic devices Signup and view all the answers

What type of resistors are used in a section of a resistor bank?

Resistors of the same value Signup and view all the answers

What is the unit of measurement for propagation delay?

ns/100 m Signup and view all the answers

What is the purpose of output meters in some signal generators?

To adjust and maintain the output at standard levels Signup and view all the answers

How many output waveforms does the FG-30 signal generator have?

Six Signup and view all the answers

What is the sweep function of the FG-30 signal generator?

A feature to produce a range of frequencies Signup and view all the answers

What is the range of power that the RF power meter can measure for COM XMTR power?

0–10 W Signup and view all the answers

What type of devices are signal generators used to test and align?

Transmitters and receivers Signup and view all the answers

What is the frequency range of the built-in counter?

1 MHz to 300 MHz Signup and view all the answers

What is a feature of the MICHEL 2210 Nav/Comm Ramp Tester that improves upon the NC 2200?

Smaller size Signup and view all the answers

What type of signals can the MICHEL 2210 Nav/Comm Ramp Tester provide?

Both radiated and directly connected signals Signup and view all the answers

What is a feature of the IFR 4000 Nav/Comm Test Set?

Compact and lightweight Signup and view all the answers

What type of receivers can the IFR 4000 Nav/Comm Test Set test?

ILS, VOR, and MKR receivers Signup and view all the answers

What should you do before commencing a pitot/static leak test?

Check the aircraft's maintenance documentation Signup and view all the answers

What is the primary purpose of the pitot/static leak test?

To detect pressure differences in the aircraft's pitot-static system Signup and view all the answers

What should you avoid when applying pressure and suction to the pitot/static system?

Using the mouth and lungs to apply pressure and suction Signup and view all the answers

What is specified in the Aircraft Maintenance Manual (AMM) for pitot/static leak testing?

The rate of increasing or decreasing pressure Signup and view all the answers

Why is it important to know how to operate the pitot/static leak testing machine?

To properly connect the machine to the aircraft pitot/static system Signup and view all the answers

What is the purpose of reading the section containing the pitot/static leak test procedure in the AMM?

To find specific information for the aircraft type Signup and view all the answers

What is the general procedure used in pitot/static leak testing?

Applying pressure and suction to the pressure heads and static vents Signup and view all the answers

What is the caution related to pitot/static leak testing?

Using the mouth and lungs to apply pressure and suction Signup and view all the answers

What precaution should be taken when handling pitot heads?

Avoid placing sideways load Signup and view all the answers

What is the consequence of failing to observe precautions when handling pitot/static instruments?

Damage to the sensing elements Signup and view all the answers

What is the purpose of inspecting the pitot pressure entry hole, drain holes, and static holes or ports?

To ensure they are not blocked Signup and view all the answers

What is the maximum temperature range of the TT1000A turbine temperature tester?

1000 °C Signup and view all the answers

What type of thermocouple system is the TT1000A turbine temperature tester designed to test?

Chromel-Alumel (CH-AL) Signup and view all the answers

When using tape to block static ports, what is required?

Documentation of the tape usage Signup and view all the answers

What is the power source of the TT1000A turbine temperature tester?

Battery power Signup and view all the answers

What feature of the TT1000A turbine temperature tester allows it to measure system lead resistance and insulation?

Self-contained design Signup and view all the answers

Study Notes

Resistors and Signal Generators

Resistors in a section have the same value, which can be 1, 10, 100, 1000, and so on, depending on the switch position.
To select a desired resistance, each switch is turned to the appropriate position, placing resistors in series.
Signal generators are standard sources of AC energy, used in electronic equipment maintenance to test and align transmitters and receivers.
They produce AC of the desired frequencies and amplitudes with necessary modulation for testing or measuring circuits.

Signal Generator Features

The FG-30 signal generator is a multi-purpose, highly reliable, and low-cost 3-MHz sweep function generator.
It provides six output waveforms, a pulse generator, and a sweep generator.
Frequency range: 0.5 Hz–3 MHz (2.5 MHz for ramp and pulse) in six steps.
Output waveforms: sine, square, triangle, positive pulse, and negative pulse.

Time-Domain Reflectometer (TDR)

A TDR is used for cable length measurement and fault locating on various types of cables.
It requires access to two conductors from one end.
The TDR transmits pulses of a known shape and amplitude into one end of a cable, which travel along the cable at a speed determined by its velocity of propagation.
Reflections are caused by impedance changes in the insulation of the cable, indicative of a fault or cable end.

Velocity of Propagation (Vp)

Vp is a ratio of the speed of light, measuring how fast a signal travels along a line.
In twisted pair cable, the velocity of propagation may be between 40% and 75% of the velocity in free space.
Vp is often stated as a percentage of the speed of light or as time-to-distance.

Avionics Aircraft System Testing

The MICHEL 2210 Nav/Comm Ramp Tester provides test signals for localiser, glideslope, VOR, MKR, and COMM.
The IFR 4000 Nav/Comm Test Set is a compact, lightweight, and weatherproof unit, designed for testing ILS, VOR, and MKR receivers, and VHF AM/FM and UHF AM transceivers.

Pitot/Static Leak Testing

The testing method consists of applying pressure and suction to the pressure heads and static vents using a leak tester and coupling adaptors.
Pitot/static leak testing machines provide positive and negative pressures for leak checks.
The rate of pressure increase or decrease should not exceed that specified in the Aircraft Maintenance Manual (AMM).

Precautions and Safety

Do not use the mouth and lungs to apply pressure and suction to a pitot/static system.
Do not increase or decrease pressure at a rate exceeding that specified in the AMM.
Do not place sideways load on pitot heads, as it may compromise their critical alignment.
Ensure heat is turned off and isolated electrically before testing.

Test Kits and Equipment

The General Electric Modern GE ADTS 500 Series Pitot Static Test Kit is a modern and advanced test kit.
The TT1000A is a self-contained, battery-powered aircraft turbine temperature system tester capable of measuring system lead resistance and insulation, and performing indicator run-outs with a range of up to 1000 °C.

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Description

This quiz covers electronic circuit analysis, including resistors, signal generators, and AC energy sources. It also touches on maintenance practices in aviation.