Canadian Advanced Qualification Question Pool
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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
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?
One time constant
A time factor of one
One exponential period
A-001-01-03
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?
An exponential period of one
A time factor of one
One exponential rate
A-001-01-04
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?
An exponential discharge of one
One time constant
One discharge period
A-001-01-05
What is meant by "back 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
After two time constants, the capacitor in an RC circuit is charged to what percentage of the supply voltage?
86.5%
95%
36.8%
A-001-01-07
After two time constants, the capacitor in an RC circuit is discharged to what percentage of the starting voltage?
36.8%
86.5%
63.2%
A-001-01-08
What is the time constant of a circuit having a 100 microfarad capacitor in series with a 470 kilohm resistor?
470 seconds
0.47 seconds
47 seconds
A-001-01-09
What is the time constant of a circuit having a 470 microfarad capacitor in series with a 470 kilohm resistor?
47 000 seconds
221 seconds
470 seconds
A-001-01-10
What is the time constant of a circuit having a 220 microfarad capacitor in series with a 470 kilohm resistor?
470 seconds
103 seconds
220 seconds
A-001-02-01
What is the result of skin effect?
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
What effect causes most of an RF current to flow along the surface of a conductor?
Resonance effect
Skin effect
Layer effect
A-001-02-03
Where does almost all RF current flow in a conductor?
In a magnetic field around the conductor
Along the surface of the conductor
In the centre of the conductor
A-001-02-04
Why does most of an RF current flow within a very thin layer under the conductor's surface?
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
Why is the resistance of a conductor different for RF currents than for direct currents?
Because of the Hertzberg effect
Because conductors are non- linear devices
Because the insulation conducts current at high frequencies
A-001-02-06
What unit measures the capacity to store electrical energy in an electrostatic field?
Watt
Volt
Farad
A-001-02-07
What is an electromagnetic field?
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
In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?
In all directions
In the same direction as the current
In the direct opposite to the current
A-001-02-09
What is the term for energy that is stored in an electromagnetic or electrostatic field?
Kinetic energy
Ampere-joules
Joule-coulombs
A-001-02-10
What is an electrostatic field?
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
A-001-02-11
What unit measures the capacity to store electrical energy in an electromagnetic field?
Farad
Watt
Henry
A-001-03-01
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?
3.56 MHz
7.96 MHz
79.6 MHz
A-001-03-02
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 MHz
1.78 kHz
1.78 MHz
A-001-03-03
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?
3.18 MHz
3.18 kHz
7.12 MHz
A-001-03-04
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?
10.1 kHz
63.7 kHz
10.1 MHz
A-001-03-05
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?
14.5 MHz
13.1 kHz
14.5 kHz
A-001-03-06
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?
17.8 MHz
19.9 kHz
17.8 kHz
A-001-03-07
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?
21.3 MHz
2.84 MHz
2.13 MHz
A-001-03-08
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?
23.7 MHz
35.4 kHz
23.7 kHz
A-001-03-09
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?
28.1 MHz
49.7 kHz
28.1 kHz
A-001-03-10
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?
5.31 MHz
17.7 MHz
1.77 MHz
A-001-03-11
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?
44 microfarads
44 picofarads
2.2 picofarads
A-001-04-01
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?
50.3 MHz
50.3 kHz
15.9 MHz
A-001-04-02
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 kHz
5.31 MHz
5.31 kHz
A-001-04-03
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?
3.54 MHz
3.54 kHz
23.7 MHz
A-001-04-04
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?
20.5 MHz
2.65 kHz
20.5 kHz
A-001-04-05
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 MHz
18.4 MHz
18.4 kHz
A-001-04-06
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 MHz
14.5 MHz
14.5 kHz
A-001-04-07
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?
. 10.3 MHz
6.63 kHz
10.3 kHz
A-001-04-08
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 kHz
3.18 MHz
3.18 kHz
A-001-04-09
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?
7.96 MHz
7.96 kHz
3.56 MHz
A-001-04-10
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 MHz
1.68 MHz
1.68 kHz
A-001-04-11
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?
3.9 millihenrys
0.353 microhenry
2.8 microhenrys
A-001-05-01
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?
0.013
71.5
75.1
A-001-05-02
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?
43.1
0.023
4.31
A-001-05-03
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?
7.35
0.00735
13.3
A-001-05-04
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?
31.9
0.0319
71.5
A-001-05-05
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?
36.8
0.368
0.273
A-001-05-06
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?
0.00452
0.221
4.52
A-001-05-07
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?
22.1
0.0256
25.6
A-001-05-08
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?
31.1
32.2
0.031
A-001-05-09
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?
4.35
0.23
0.00435
A-001-05-10
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?
54.3
23
1.84
A-001-05-11
Why is a resistor often included in a parallel resonant circuit?
To decrease the Q and increase the resonant frequency
To increase the Q and decrease bandwidth
To decrease the Q and increase the bandwidth