Exam Primer

Overview
1. Regulations and Policies
  • Authority and Regulations
  • Licence
  • License Penalties
  • Certificate
  • Operation, Repair
  • Content Restrictions
  • Operating Restrictions
  • Interference
  • Emergencies
  • Non-remuneration, Privacy
  • Call Signs
  • Other Countries
  • Frequency Bands
  • Power Allowed
  • unmodulated carriers, retransmission
  • amplitude modulation, frequency stability, me
  • International Telecommunication Union (ITU)
  • Exams
  • Antenna Structures
  • RF Field Strength
  • Resolving Complaints
  • 2. Operating and Procedures
  • VHF/UHF Repeaters - Voice
  • Phonetic Alphabet
  • Voice Operating Procedures
  • tuning, testing and dummy loads
  • Morse Code (CW) procedures
  • RST signal reporting, S meter
  • Q Signals
  • Emergency Operating Procedures
  • Record Keeping, Antenna Orientation and Maps
  • 3. Station Assembly, Practice and Safety
  • Layout of HF Stations
  • Layout of FM Transmitters
  • Layout of FM Receivers
  • Layout of CW Transmitters
  • Layout of SSB/CW receivers
  • Layout of SSB Transmitters
  • Layout of Digital Systems
  • Layout of Regulated Power Supplies
  • Layout of Yagi-Uda Antennas
  • Receiver Fundamentals
  • Transmitter, carrier, keying, AM
  • Carrier Suppression, SSB
  • Frequency and Phase Modulation
  • Station Accessories
  • Digital Modes
  • Batteries
  • Power Supplies
  • Electrical Safety
  • Antenna and Tower Safety
  • RF Exposure Safety
  • 4. Circuit Components
  • Amplifier Fundamentals
  • Diodes
  • Bipolar Transistors
  • Field-effect Transistors
  • Tiode Vacuum Tubes
  • Resister Color Codes
  • 5. Basic Electronics and Theory
  • Metric Prefixes
  • Basic Concepts
  • Circuits
  • Ohm's law
  • Series and Parallel Resistors
  • Power law, Resister Power Disipation
  • AC and frequency
  • Ratios, Logarithms and Decibels
  • Inductance and Capacitance
  • Reactance and Impedance
  • Magnetica and Transformers
  • Resonance and Tuned Circuits
  • Meters and Measurements
  • 6. Feedlines and Antenna Systems
  • Impedance and Feedlines
  • Balanced and Unbalanced feedlines
  • Feedlines and Connectors
  • Line Losses
  • Standing Wave Ratio
  • Impedance Matching
  • Isotropic Sources, Polarization
  • Wavelength vs Physical Length
  • Antenna Radiation Patterns
  • Vertical Antennas
  • Yagi Antennas
  • Wire Antennas
  • Quad/loop Antennas
  • 7. Radio Wave Propagation
  • Propogation Types
  • Ionospheric Regions
  • Hops and Skips
  • Ionosphere Issues
  • Solar Activity
  • MF and HF and Skywaves
  • VHF and UHF, Sporadic-E, Aurira, Ducting
  • Scatter - HF, VHF, UHF
  • 8. Interference and Suppression
  • Front-end overload
  • Audio Rectification, Bypass Capacitors, Ferri
  • Intermodulation, Spurious, Key-clicks
  • Harmonics, Splatter, Transmitter Adjustments
  • Filters
  • 5.10 Reactance and Impedance

    Practice


    B-005-10-01
    How does a coil react to AC?
    As the amplitude of the applied AC increases, the reactance decreases
    As the amplitude of the applied AC increases, the reactance increases
    As the frequency of the applied AC increases, the reactance increases
    As the frequency of the applied AC increases, the reactance decreases

    B-005-10-02
    How does a capacitor react to AC?
    As the frequency of the applied AC increases, the reactance decreases
    As the frequency of the applied AC increases, the reactance increases
    As the amplitude of the applied AC increases, the reactance increases
    As the amplitude of the applied AC increases, the reactance decreases

    B-005-10-03
    The reactance of capacitors increases as:
    applied voltage increases
    AC frequency decreases
    applied voltage decreases
    AC frequency increases

    B-005-10-04
    In inductances, AC may be opposed by both resistance of winding wire and reactance due to inductive effect. The term which includes resistance and reactance is:
    resonance
    inductance
    impedance
    capacitance

    B-005-10-05
    Capacitive reactance:
    decreases as frequency increases
    applies only to series RLC circuits
    increases as frequency increases
    increases with the time constant

    B-005-10-06
    Inductive reactance may be increased by:
    a decrease in the applied frequency
    a decrease in the supplied current
    an increase in the applied voltage
    an increase in the applied frequency

    B-005-10-07
    A choke coil of 4.25 microhenrys is used in a circuit at a frequency of 200 MHz. Its reactance is approximately:
    5 740 ohms
    5 340 ohms
    7 540 ohms
    4 750 ohms

    B-005-10-08
    The capacitive reactance of a 25 microfarad capacitor connected to a 60 hertz line is:
    106.1 ohms
    9 420 ohms
    2.4 ohms
    1 500 ohms

    B-005-10-09
    A power-supply filter has a capacitor of 10 microfarad. What is the capacitive reactance of this capacitor to a frequency of 60 hertz?
    200 ohms
    100 ohms
    500 ohms
    265 ohms

    B-005-10-10
    What is the approximate inductive reactance of a 1 henry choke coil used in a 60 hertz circuit?
    376 ohms
    3760 ohms
    188 ohms
    1888 ohms

    B-005-10-11
    In general, the reactance of inductors increases with:
    increasing AC frequency
    decreasing AC frequency
    decreasing applied voltage
    increasing applied voltage