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RIC-8 — Advanced Qualification Question Bank for Amateur Radio Operator Certificate

A-001-01-01 (4)
What is the meaning of the term "time constant" in an RL circuit?

  • The time required for the current in the circuit to build up to 36.8% of the maximum value
  • The time required for the voltage in the circuit to build up to 63.2% of the maximum value
  • The time required for the voltage in the circuit to build up to 36.8% of the maximum value
  • The time required for the current in the circuit to build up to 63.2% of the maximum value

A-001-01-02 (2)
What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the supply voltage?

  • An exponential rate of one
  • One time constant
  • A time factor of one
  • One exponential period

A-001-01-03 (1)
What is the term for the time required for the current in an RL circuit to build up to 63.2% of the maximum value?

  • One time constant
  • An exponential period of one
  • A time factor of one
  • One exponential rate

A-001-01-04 (3)
What is the term for the time it takes for a charged capacitor in an RC circuit to discharge to 36.8% of its initial value of stored charge?

  • A discharge factor of one
  • An exponential discharge of one
  • One time constant
  • One discharge period

A-001-01-05 (2)
What is meant by "back EMF"?

  • A current that opposes the applied EMF
  • A voltage that opposes the applied EMF
  • An opposing EMF equal to R times C percent of the applied EMF
  • A current equal to the applied EMF

A-001-01-06 (2)
After two time constants, the capacitor in an RC circuit is charged to what percentage of the supply voltage?

  • 63.2%
  • 86.5%
  • 95%
  • 36.8%

A-001-01-07 (1)
After two time constants, the capacitor in an RC circuit is discharged to what percentage of the starting voltage?

  • 13.5%
  • 36.8%
  • 86.5%
  • 63.2%

A-001-01-08 (4)
What is the time constant of a circuit having a 100 microfarad capacitor in series with a 470 kilohm resistor?

  • 4700 seconds
  • 470 seconds
  • 0.47 seconds
  • 47 seconds

A-001-01-09 (3)
What is the time constant of a circuit having a 470 microfarad capacitor in series with a 470 kilohm resistor?

  • 221 000 seconds
  • 47 000 seconds
  • 221 seconds
  • 470 seconds

A-001-01-10 (3)
What is the time constant of a circuit having a 220 microfarad capacitor in series with a 470 kilohm resistor?

  • 470 000 seconds
  • 470 seconds
  • 103 seconds
  • 220 seconds
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A-001-02-01 (1)
What is the result of skin effect?

  • As frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface
  • As frequency decreases, RF current flows in a thinner layer of the conductor, closer to the surface
  • Thermal effects on the surface of the conductor increase impedance
  • Thermal effects on the surface of the conductor decrease impedance

A-001-02-02 (3)
What effect causes most of an RF current to flow along the surface of a conductor?

  • Piezoelectric effect
  • Resonance effect
  • Skin effect
  • Layer effect

A-001-02-03 (3)
Where does almost all RF current flow in a conductor?

  • In a magnetic field in the centre of the conductor
  • In a magnetic field around the conductor
  • Along the surface of the conductor
  • In the centre of the conductor

A-001-02-04 (2)
Why does most of an RF current flow within a very thin layer under the conductor's surface?

  • Becasue the RF resistance of a conductor is much less than the DC resistance
  • Because of skin effect
  • Because a conductor has AC resistance due to self-inductance
  • Because of heating of the conductor's interior

A-001-02-05 (1)
Why is the resistance of a conductor different for RF currents than for direct currents?

  • Because of skin effect
  • Because of the Hertzberg effect
  • Because conductors are non-linear devices
  • Because the insulation conducts current at high frequencies

A-001-02-06 (4)
What unit measures the capacity to store electrical energy in an electrostatic field?

  • Coulomb
  • Watt
  • Volt
  • Farad

A-001-02-07 (4)
What is an electromagnetic field?

  • Current through the space around a permanent magnet
  • The force that drives current through a conductor
  • The current between the plates of a charged capacitor
  • The space around a conductor, through which a magnetic force acts

A-001-02-08 (1)
In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?

  • In the direction determined by the lefthand rule
  • In all directions
  • In the same direction as the current
  • In the direct opposite to the current

A-001-02-09 (1)
What is the term for energy that is stored in an electromagnetic or electrostatic field?

  • Potential energy
  • Kinetic energy
  • Ampere-joules
  • Joule-coulombs

A-001-02-10 (1)
What is an electrostatic field?

  • The current between the plates of a charged capacitor
  • The space around a conductor, through which a magnetic force acts
  • Current through the space around a permanent magnet
  • The force that drives current through a conductor
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A-001-02-11 (4)
What unit measures the capacity to store electrical energy in an electromagnetic field?

  • Coulomb
  • Farad
  • Watt
  • Henry

A-001-03-01 (2)
What is the resonant frequency of a series R-L-C circuit if R is 47 ohms, L is 50 microhenrys and C is 40 picofarads?

  • 1.78 MHz
  • 3.56 MHz
  • 7.96 MHz
  • 79.6 MHz

A-001-03-02 (4)
What is the resonant frequency of a series R-L-C circuit, if R is 47 ohms, L is 40 microhenrys and C is 200 picofarads?

  • 1.99 kHz
  • 1.99 MHz
  • 1.78 kHz
  • 1.78 MHz

A-001-03-03 (4)
What is the resonant frequency of a series R-L-C circuit, if R is 47 ohms, L is 50 microhenrys and C is 10 picofarads?

  • 7.12 kHz
  • 3.18 MHz
  • 3.18 kHz
  • 7.12 MHz

A-001-03-04 (4)
What is the resonant frequency of a series R-L-C circuit, if R is 47 ohms, L is 25 microhenrys and C is 10 picofarads?

  • 63.7 MHz
  • 10.1 kHz
  • 63.7 kHz
  • 10.1 MHz

A-001-03-05 (2)
What is the resonant frequency of a series R-L-C circuit, if R is 47 ohms, L is 3 microhenrys and C is 40 picofarads?

  • 13.1 MHz
  • 14.5 MHz
  • 13.1 kHz
  • 14.5 kHz

A-001-03-06 (2)
What is the resonant frequency of a series R-L-C circuit, if R is 47 ohms, L is 4 microhenrys and C is 20 picofarads?

  • 19.9 MHz
  • 17.8 MHz
  • 19.9 kHz
  • 17.8 kHz

A-001-03-07 (2)
What is the resonant frequency of a series R-L-C circuit, if R is 47 ohms, L is 8 microhenrys and C is 7 picofarads?

  • 28.4 MHz
  • 21.3 MHz
  • 2.84 MHz
  • 2.13 MHz

A-001-03-08 (2)
What is the resonant frequency of a series R-L-C circuit, if R is 47 ohms, L is 3 microhenrys and C is 15 picofarads?

  • 35.4 MHz
  • 23.7 MHz
  • 35.4 kHz
  • 23.7 kHz

A-001-03-09 (2)
What is the resonant frequency of a series R-L-C circuit, if R is 47 ohms, L is 4 microhenrys and C is 8 picofarads?

  • 49.7 MHz
  • 28.1 MHz
  • 49.7 kHz
  • 28.1 kHz
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A-001-03-10 (1)
What is the resonant frequency of a series R-L-C circuit, if R is 47 ohms, L is 1 microhenry and C is 9 picofarads?

  • 53.1 MHz
  • 5.31 MHz
  • 17.7 MHz
  • 1.77 MHz

A-001-03-11 (3)
What is the value of capacitance (C) in a series R-L-C circuit, if the circuit resonant frequency is 14.25 MHz and L is 2.84 microhenrys?

  • 2.2 microfarads
  • 44 microfarads
  • 44 picofarads
  • 2.2 picofarads

A-001-04-01 (2)
What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 1 microhenry and C is 10 picofarads?

  • 15.9 kHz
  • 50.3 MHz
  • 50.3 kHz
  • 15.9 MHz

A-001-04-02 (1)
What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 2 microhenrys and C is 15 picofarads?

  • 29.1 MHz
  • 29.1 kHz
  • 5.31 MHz
  • 5.31 kHz

A-001-04-03 (4)
What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 5 microhenrys and C is 9 picofarads?

  • 23.7 kHz
  • 3.54 MHz
  • 3.54 kHz
  • 23.7 MHz

A-001-04-04 (2)
What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 2 microhenrys and C is 30 picofarads?

  • 2.65 MHz
  • 20.5 MHz
  • 2.65 kHz
  • 20.5 kHz

A-001-04-05 (3)
What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 15 microhenrys and C is 5 picofarads?

  • 2.12 kHz
  • 2.12 MHz
  • 18.4 MHz
  • 18.4 kHz

A-001-04-06 (3)
What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 3 microhenrys and C is 40 picofarads?

  • 1.33 kHz
  • 1.33 MHz
  • 14.5 MHz
  • 14.5 kHz

A-001-04-07 (2)
What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 40 microhenrys and C is 6 picofarads?

  • 6.63 MHz
  • 10.3 MHz
  • 6.63 kHz
  • 10.3 kHz

A-001-04-08 (1)
What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 10 microhenrys and C is 50 picofarads?

  • 7.12 MHz
  • 7.12 kHz
  • 3.18 MHz
  • 3.18 kHz
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A-001-04-09 (4)
What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 200 microhenrys and C is 10 picofarads?

  • 3.56 kHz
  • 7.96 MHz
  • 7.96 kHz
  • 3.56 MHz

A-001-04-10 (3)
What is the resonant frequency of a parallel R-L-C circuit if R is 4.7 kilohms, L is 90 microhenrys and C is 100 picofarads?

  • 1.77 kHz
  • 1.77 MHz
  • 1.68 MHz
  • 1.68 kHz

A-001-04-11 (4)
What is the value of inductance (L) in a parallel R-L-C circuit, if the resonant frequency is 14.25 MHz and C is 44 picofarads?

  • 253.8 millihenrys
  • 3.9 millihenrys
  • 0.353 microhenry
  • 2.8 microhenrys

A-001-05-01 (4)
What is the Q of a parallel R-L-C circuit, if it is resonant at 14.128 MHz, L is 2.7 microhenrys and R is 18 kilohms?

  • 7.51
  • 0.013
  • 71.5
  • 75.1

A-001-05-02 (2)
What is the Q of a parallel R-L-C circuit, if it is resonant at 14.128 MHz, L is 4.7 microhenrys and R is 18 kilohms?

  • 13.3
  • 43.1
  • 0.023
  • 4.31

A-001-05-03 (1)
What is the Q of a parallel R-L-C circuit, if it is resonant at 4.468 MHz, L is 47 microhenrys and R is 180 ohms?

  • 0.136
  • 7.35
  • 0.00735
  • 13.3

A-001-05-04 (2)
What is the Q of a parallel R-L-C circuit, if it is resonant at 14.225 MHz, L is 3.5 microhenrys and R is 10 kilohms?

  • 7.35
  • 31.9
  • 0.0319
  • 71.5

A-001-05-05 (1)
What is the Q of a parallel R-L-C circuit, if it is resonant at 7.125 MHz, L is 8.2 microhenrys and R is 1 kilohm?

  • 2.73
  • 36.8
  • 0.368
  • 0.273

A-001-05-06 (3)
What is the Q of a parallel R-L-C circuit, if it is resonant at 7.125 MHz, L is 10.1 microhenrys and R is 100 ohms?

  • 22.1
  • 0.00452
  • 0.221
  • 4.52

A-001-05-07 (1)
What is the Q of a parallel R-L-C circuit, if it is resonant at 7.125 MHz, L is 12.6 microhenrys and R is 22 kilohms?

  • 39
  • 22.1
  • 0.0256
  • 25.6
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A-001-05-08 (3)
What is the Q of a parallel R-L-C circuit, if it is resonant at 3.625 MHz, L is 3 microhenrys and R is 2.2 kilohms?

  • 25.6
  • 31.1
  • 32.2
  • 0.031

A-001-05-09 (3)
What is the Q of a parallel R-L-C circuit, if it is resonant at 3.625 MHz, L is 42 microhenrys and R is 220 ohms?

  • 2.3
  • 4.35
  • 0.23
  • 0.00435

A-001-05-10 (4)
What is the Q of a parallel R-L-C circuit, if it is resonant at 3.625 MHz, L is 43 microhenrys and R is 1.8 kilohms?

  • 0.543
  • 54.3
  • 23
  • 1.84

A-001-05-11 (4)
Why is a resistor often included in a parallel resonant circuit?

  • To increase the Q and decrease the skin effect
  • To decrease the Q and increase the resonant frequency
  • To increase the Q and decrease bandwidth
  • To decrease the Q and increase the bandwidth
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