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
  • 5.11 Magnetica and Transformers

    Practice


    B-005-11-01
    If no load is attached to the secondary winding of a transformer, what is current in the primary winding called?
    Magnetizing current
    Direct current
    Excitation current
    Stabilizing current

    B-005-11-02
    A transformer operates a 6.3 volt 2 ampere light bulb from its secondary winding. The power consumed by the primary winding is approximately:
    13 watts
    6 watts
    8 watts
    3 watts

    B-005-11-03
    A transformer has a 240 volt primary that draws a current of 250 mA from the mains supply. Assuming no losses, what current would be available from a 12 volt secondary?
    215 amperes
    25 amperes
    50 amperes
    5 amperes

    B-005-11-04
    In a mains power transformer, the primary winding has 250 turns, and the secondary has 500. If the input voltage is 110 volts, the likely secondary voltage is:
    440 V
    220 V
    560 V
    24 V

    B-005-11-05
    The strength of the magnetic field around a conductor in air is:
    inversely proportional to the diameter of the conductor
    directly proportional to the diameter of the conductor
    directly proportional to the current in the conductor
    inversely proportional to the voltage on the conductor

    B-005-11-06
    Maximum induced voltage in a coil occurs when:
    current is going through its greatest rate of change
    the current through the coil is of a DC nature
    current is going through its least rate of change
    the magnetic field around the coil is not changing

    B-005-11-07
    The voltage induced in a conductor moving in a magnetic field is at a maximum when the movement is:
    made in a counterclockwise direction
    parallel to the lines of force
    perpendicular to the lines of force
    made in a clockwise direction

    B-005-11-08
    A 100% efficient transformer has a turns ratio of 1/5. If the secondary current is 50 mA, the primary current is:
    2 500 mA
    0.01 A
    0.25 A
    0.25 mA

    B-005-11-09
    A force of repulsion exists between two _______ magnetic poles.
    unlike
    positive
    negative
    like

    B-005-11-10
    A permanent magnet would most likely be made from:
    copper
    aluminum
    brass
    steel

    B-005-11-11
    The fact that energy transfer from primary to secondary windings in a power transformer is not perfect is indicated by:
    electrostatic shielding
    large secondary currents
    warm iron laminations
    high primary voltages