Element IV - Amateur Radio Practice

25 Questions | Total Attempts: 547

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Element Quizzes & Trivia

Questions and Answers
  • 1. 
    When the collector is common to both the input and the output of a transistor circuit the transistor is configured in
    • A. 

      Common base

    • B. 

      Common collector

    • C. 

      Common emitter

    • D. 

      None of the above

  • 2. 
    The logarithm of the ratio of the output power over the input power is
    • A. 

      Watts

    • B. 

      Decibels

    • C. 

      Bell

    • D. 

      Gain

  • 3. 
    The frequencies comprising the extra high frequency (EHF)
    • A. 

      30 kHZ to 300 MHZ

    • B. 

      30 GHZ to 300 GHZ

    • C. 

      30 MHZ to 300 GHZ

    • D. 

      30 HZ to 300 HZ

  • 4. 
    A voltage standing wave ratio of an antenna is measured with
    • A. 

      Grid-dip meter

    • B. 

      An SWR meter

    • C. 

      Voltmeter

    • D. 

      Impedance meter

  • 5. 
    What is the capacitance of a 6 uF capacitor in parallel with a capacitor 4 uF?
    • A. 

      5 uF

    • B. 

      2 uF

    • C. 

      10 uF

    • D. 

      6 uF

  • 6. 
    A series circuit consists of inductance of 500 uH and a capacitor of 400 pF. What is the resonant frequency of the circuit?
    • A. 

      456 kHz

    • B. 

      356 kHz

    • C. 

      500 kHz

    • D. 

      400 kHz

  • 7. 
    What is the capacitive reactance of 350 pF capacitor a t a frequency of 1200 kHz?
    • A. 

      560 ohms

    • B. 

      379 ohms

    • C. 

      379 uf

    • D. 

      379 henry

  • 8. 
    Three cells, each with an EMF of 1.4 Volts and internal resistance of 0.15 ohms, are connected in parallel, and a resistance of 1.35 ohms is connected across the group. How much current flows in the circuit?
    • A. 

      1.0 Ampere

    • B. 

      2.0 Ampere

    • C. 

      3.0 Ampere

    • D. 

      4.0 Ampere

  • 9. 
    A cell whose internal resistance is 0.15 ohms delivers 0.50 Ampere to a resistance of 2.85 ohms.  What is the EMF of the cell?
    • A. 

      1.0 Volts

    • B. 

      1.5 Volts

    • C. 

      3.0 Volts

    • D. 

      3.5 Volts

  • 10. 
    No. 14 copper wire has a resistance of 2.58 ohms/1000 ft.  What is the resistance of 1 mile of this wire?
    • A. 

      23.6 ohms

    • B. 

      10.6 ohms

    • C. 

      13.6 ohms

    • D. 

      15.6 ohms

  • 11. 
    Three resistors R1 = 30 ohms, R2 = 160 ohms and R3 = 40 ohms are connected in series across a generator.  A voltmeter connected  across R2 reads 80 Volts.  What is the voltage of the generator?   
    • A. 

      220 Volts

    • B. 

      115 Volts

    • C. 

      110 Volts

    • D. 

      240 Volts

  • 12. 
    A voltage of  110 Volts across a resistor causes a current of 5 Ampere to flow through the resistor.  How much power is expended in the resistor?
    • A. 

      5 Watts

    • B. 

      50 Watts

    • C. 

      500 Watts

    • D. 

      550 Watts

  • 13. 
    How much current will flow through a resistance of 50 ohms if a potential of  220 Volts is applied across it?
    • A. 

      4.40 ohms

    • B. 

      440 ohms

    • C. 

      40 ohms

    • D. 

      0.40 ohms

  • 14. 
    A voltmeter connected across a resistance reads 22 V, and an ammeter connected in series with resistance reads 2.6 A.  What is the value of the resistance?
    • A. 

      8.46 ohms

    • B. 

      84.6 ohms

    • C. 

      846 ohms

    • D. 

      84.6 Kiloohms

  • 15. 
    What is the characteristic of the current flow in a series RLC circuit at resonance
    • A. 

      It is minimum

    • B. 

      It is maximum

    • C. 

      It is medium

    • D. 

      None of the above

  • 16. 
    What is the approximate magnitude of  the impedance of a parallel RLC circuit at resonance
    • A. 

      Low

    • B. 

      Mid

    • C. 

      High

    • D. 

      Low Mid

  • 17. 
    What is the approximate magnitude of the impedance of a parallel RLC circuit at resonance
    • A. 

      Low

    • B. 

      Mid

    • C. 

      High

    • D. 

      Low mid

  • 18. 
    What is the term for the phenomenon where most of a radio frequency current flows along the surface of the conductor
    • A. 

      Field effect

    • B. 

      Skin effect

    • C. 

      Thermal effect

    • D. 

      Burn effect

  • 19. 
    The primary winding of a transformer has 2,000 turns and the secondary winding has has 500 turns.  If the primary is connected to 220 volts AC, what is the secondary voltage    
    • A. 

      5.5 volts

    • B. 

      55 volts

    • C. 

      550 volts

    • D. 

      0.55 volts

  • 20. 
    Give the decimal  equivalence of a picofarad
    • A. 

      0.000,000,000,000,001 F

    • B. 

      0.000,001 F

    • C. 

      0.000,000,001 F

    • D. 

      0.000,000,000,001 F

  • 21. 
    Microfarad and picofaradare unit of
    • A. 

      Resistance

    • B. 

      Capacitance

    • C. 

      Impedance

    • D. 

      Inductance

  • 22. 
    Describe the component part of a  capacitor
    • A. 

      Parallel resistive plates by plastic

    • B. 

      Parallel conductive plates by dielectric

    • C. 

      Parallel rubber plates by dielectric

    • D. 

      Parallel inductive plates by copper

  • 23. 
    In an electrical circuit, what is the opposition to the flow of  direct current caused by inductance of capacitance.
    • A. 

      Conductance

    • B. 

      Impedance

    • C. 

      Reactance

    • D. 

      Inductance

  • 24. 
    How is the effect of reactance represented in formulas
    • A. 

      X

    • B. 

      Y

    • C. 

      Z

    • D. 

      F

  • 25. 
    What is the opposition to the flow of an alternating current in circuit containing both resistance and reactance called?
    • A. 

      Impedance

    • B. 

      Inductance

    • C. 

      Capacitance

    • D. 

      Resistance