Advanced Amateur A-001 Practice Exam

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Practice Exam for Section A-001 of the ISED Advanced Amateur Radio Examination.

This resource is part of the Advanced Amateur Certification website.

What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 2 microhenrys and C is 15 picofarads? *

A-001-004-002

1 point

29.1 MHz

5.31 kHz

29.1 kHz

5.31 MHz

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-001-001-004

1 point

An exponential discharge of one

One discharge period

A discharge factor of one

One time constant

What is the Q of a parallel RLC circuit, if it is resonant at 3.625 MHz, L is 43 microhenrys and R is 1.8 kilohms? *

A-001-005-010

1 point

0.543

54.3

1.84

What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 3 microhenrys and C is 40 picofarads? *

A-001-003-005

1 point

14.5 MHz

14.5 kHz

13.1 kHz

13.1 MHz

What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 200 microhenrys and C is 10 picofarads? *

A-001-004-009

1 point

3.56 MHz

7.96 kHz

7.96 MHz

3.56 kHz

What is the time constant of a circuit having a 220 microfarad capacitor in series with a 470 kilohm resistor? *

A-001-001-010

1 point

103 seconds

470 seconds

470 000 seconds

220 seconds

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? *

A-001-003-011

1 point

44 picofarads

44 microfarads

2.2 picofarads

2.2 microfarads

In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow? *

A-001-002-008

1 point

In the direction determined by the left-hand rule

In the same direction as the current

In the direct opposite to the current

In all directions

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? *

A-001-001-003

1 point

One exponential rate

An exponential period of one

A time factor of one

One time constant

What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 50 microhenrys and C is 10 picofarads? *

A-001-003-003

1 point

7.12 kHz

3.18 MHz

3.18 kHz

7.12 MHz

What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 4 microhenrys and C is 8 picofarads? *

A-001-003-009

1 point

28.1 MHz

49.7 kHz

28.1 kHz

49.7 MHz

What is the time constant of a circuit having a 470 microfarad capacitor in series with a 470 kilohm resistor? *

A-001-001-009

1 point

470 seconds

47 000 seconds

221 000 seconds

221 seconds

What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 40 microhenrys and C is 6 picofarads? *

A-001-004-007

1 point

10.3 MHz

6.63 kHz

10.3 kHz

6.63 MHz

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? *

A-001-001-002

1 point

One exponential period

An exponential rate of one

One time constant

A time factor of one

What is the Q of a parallel RLC circuit, if it is resonant at 7.125 MHz, L is 8.2 microhenrys and R is 1 kilohm? *

A-001-005-005

1 point

0.368

0.273

2.73

36.8

After two time constants, the capacitor in an RC circuit is charged to what percentage of the supply voltage? *

A-001-001-006

1 point

95%

86.5%

63.2%

36.8%

Why is a resistor often included in a parallel resonant circuit ? *

A-001-005-011

1 point

To increase the Q and decrease the skin effect

To increase the Q and decrease bandwidth

To decrease the Q and increase the resonant frequency

To decrease the Q and increase the bandwidth

What unit measures the ability of a capacitor to store electrical charge? *

A-001-002-006

1 point

Coulomb

Farad

Volt

Watt

Between the charged plates of a capacitor there is: *

A-001-002-010

1 point

a cloud of electrons

an electric current

an electrostatic field

a magnetic field

What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 3 microhenrys and C is 40 picofarads? *

A-001-004-006

1 point

1.33 MHz

14.5 kHz

1.33 kHz

14.5 MHz

What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 5 microhenrys and C is 9 picofarads? *

A-001-004-003

1 point

23.7 MHz

23.7 kHz

3.54 kHz

3.54 MHz

What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 3 microhenrys and C is 15 picofarads? *

A-001-003-008

1 point

23.7 kHz

35.4 MHz

35.4 kHz

23.7 MHz

What is the term for energy that is stored in an electromagnetic or electrostatic field? *

A-001-002-009

1 point

Ampere-joules

Kinetic energy

Potential energy

Joule-coulombs

What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 4 microhenrys and C is 20 picofarads? *

A-001-003-006

1 point

17.8 MHz

17.8 kHz

19.9 MHz

19.9 kHz

What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 2 microhenrys and C is 30 picofarads? *

A-001-004-004

1 point

20.5 kHz

20.5 MHz

2.65 MHz

2.65 kHz

What is the Q of a parallel RLC circuit, if it is resonant at 3.625 MHz, L is 42 microhenrys and R is 220 ohms? *

A-001-005-009

1 point

2.3

0.23

4.35

0.00435

What is the Q of a parallel RLC circuit, if it is resonant at 14.128 MHz, L is 4.7 microhenrys and R is 18 kilohms? *

A-001-005-002

1 point

4.31

13.3

0.023

43.1

What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 90 microhenrys and C is 100 picofarads? *

A-001-004-010

1 point

1.68 MHz

1.68 kHz

1.77 kHz

1.77 MHz

What effect causes most of an RF current to flow along the surface of a conductor? *

A-001-002-002

1 point

Skin effect

Layer effect

Resonance effect

Piezoelectric effect

What is the Q of a parallel RLC circuit, if it is resonant at 7.125 MHz, L is 12.6 microhenrys and R is 22 kilohms? *

A-001-005-007

1 point

25.6

0.0256

22.1

What is the Q of a parallel RLC circuit, if it is resonant at 14.128 MHz, L is 2.7 microhenrys and R is 18 kilohms? *

A-001-005-001

1 point

7.51

71.5

0.013

75.1

What is the value of inductance (L) in a parallel RLC circuit, if the resonant frequency is 14.25 MHz and C is 44 picofarads? *

A-001-004-011

1 point

3.9 millihenrys

0.353 microhenry

2.8 microhenrys

253.8 millihenrys

Why is the resistance of a conductor different for RF currents than for direct currents? *

A-001-002-005

1 point

Because of skin effect

Because of the Hertzberg effect

Because conductors are non-linear devices

Because the insulation conducts current at high frequencies

What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 1 microhenry and C is 10 picofarads? *

A-001-004-001

1 point

50.3 MHz

15.9 kHz

15.9 MHz

50.3 kHz

What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 25 microhenrys and C is 10 picofarads? *

A-001-003-004

1 point

63.7 kHz

63.7 MHz

10.1 kHz

10.1 MHz

What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 40 microhenrys and C is 200 picofarads? *

A-001-003-002

1 point

1.78 MHz

1.78 kHz

1.99 kHz

1.99 MHz

What is the Q of a parallel RLC circuit, if it is resonant at 3.625 MHz, L is 3 microhenrys and R is 2.2 kilohms? *

A-001-005-008

1 point

31.1

32.2

25.6

0.031

A wire has a current passing through it. Surrounding this wire there is: *

A-001-002-007

1 point

an electromagnetic field

a skin effect that diminishes with distance

a cloud of electrons

an electrostatic field

What is the time constant of a circuit having a 100 microfarad capacitor in series with a 470 kilohm resistor? *

A-001-001-008

1 point

47 seconds

470 seconds

4700 seconds

0.47 seconds

After two time constants, the capacitor in an RC circuit is discharged to what percentage of the starting voltage? *

A-001-001-007

1 point

36.8%

86.5%

63.2%

13.5%

What is the meaning of the term "time constant" in an RL circuit ? *

A-001-001-001

1 point

The time required for the current 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 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

What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 8 microhenrys and C is 7 picofarads? *

A-001-003-007

1 point

28.4 MHz

21.3 MHz

2.84 MHz

2.13 MHz

What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 10 microhenrys and C is 50 picofarads? *

A-001-004-008

1 point

3.18 kHz

7.12 MHz

7.12 kHz

3.18 MHz

Where does almost all RF current flow in a conductor? *

A-001-002-003

1 point

In a magnetic field in the centre of the conductor

In the centre of the conductor

In a magnetic field around the conductor

Along the surface of the conductor

What is the Q of a parallel RLC circuit, if it is resonant at 14.225 MHz, L is 3.5 microhenrys and R is 10 kilohms? *

A-001-005-004

1 point

31.9

7.35

0.0319

71.5

What is the resonant frequency of a parallel RLC circuit if R is 4.7 kilohms, L is 15 microhenrys and C is 5 picofarads? *

A-001-004-005

1 point

2.12 kHz

2.12 MHz

18.4 kHz

18.4 MHz

What is the result of skin effect? *

A-001-002-001

1 point

Thermal effects on the surface of the conductor increase impedance

Thermal effects on the surface of the conductor decrease impedance

As frequency decreases, RF current flows in a thinner layer of the conductor, closer to the surface

As frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface

What is the resonant frequency of a series RLC circuit if R is 47 ohms, L is 50 microhenrys and C is 40 picofarads? *

A-001-003-001

1 point

7.96 MHz

79.6 MHz

3.56 MHz

1.78 MHz

Why does most of an RF current flow within a very thin layer under the conductor's surface? *

A-001-002-004

1 point

Because the RF resistance of a conductor is much less than the DC resistance

Because a conductor has AC resistance due to self-inductance

Because of skin effect

Because of heating of the conductor's interior

What is the Q of a parallel RLC circuit, if it is resonant at 4.468 MHz, L is 47 microhenrys and R is 180 ohms? *

A-001-005-003

1 point

0.00735

13.3

0.136

7.35

Energy is stored within an inductor that is carrying a current. The amount of energy depends on this current, but it also depends on a property of the inductor. This property has the following unit: *

A-001-002-011

1 point

watt

henry

coulomb

farad

What is meant by "back EMF"? *

A-001-001-005

1 point

A current equal to 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 that opposes the applied EMF

What is the Q of a parallel RLC circuit, if it is resonant at 7.125 MHz, L is 10.1 microhenrys and R is 100 ohms? *

A-001-005-006

1 point

22.1

0.00452

4.52

0.221

What is the resonant frequency of a series RLC circuit, if R is 47 ohms, L is 1 microhenry and C is 9 picofarads? *

A-001-003-010

1 point

53.1 MHz

5.31 MHz

1.77 MHz

17.7 MHz

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