WorksheetsELECS 14
Total questions: 50
Worksheet time: 25mins
What is the applied voltage for a series RLC circuit when IT = 3 mA, VL = 30 V, VC = 18 V, and R = 1000 ohms?
3.00 V
12.37 V
34.98 V
48.00 V
What is the bandwidth of the circuit?
31.8 Hz
32.3 Hz
142 Hz
7.2 kHz
In a parallel RLC circuit, which value may always be used as a vector reference?
current
reactance
resistance
voltage
What is the Q (Quality factor) of a series circuit that resonates at 6 kHz, has equal reactance of 4 kilo-ohms each, and a resistor value of 50 ohms?
0.001
50
80
4.0
How much current will flow in a 100 Hz series RLC circuit if VS = 20 V, RT = 66 ohms, and XT = 47 ohms?
1.05 A
303 mA
247 mA
107 mA
What is the range between f1 and f2 of an RLC circuit that resonates at 150 kHz and has a Q of 30?
100.0 kHz to 155.0 kHz
147.5 kHz to 152.5 kHz
4500 kHz to 295.5 kHz
149,970 Hz to 150,030 Hz
What is the quality factor?
999
223
2.2
0.99
What effect will a parallel tank have upon final filter current?
very little
The bandpass frequencies will change.
The frequency cutoff will change.
The impedance will block output.
What is the total current?
56.6 mA
141 mA
191 mA
244 mA
When a parallel circuit resonates it is said to:
flywheel
oscillate
both of the above
none of the above
What is the resonant frequency in the given circuit?
11.6 Hz
275.8 Hz
1.5 kHz
3.2 kHz
Series RLC voltage or impedance totals must be calculated by:
subtracting the values
graphing the angles
adding vectors
multiplying the values
What is the total current?
15.6 mA
17.8 mA
21.9 mA
26.0 mA
When XC = XL the circuit:
draws maximum current
applied voltage is zero
is at resonance
draws minimum current
How much current will flow in a series RLC circuit when VT = 100 V,
XL = 160 , XC = 80 , and R = 60 ?
1 A
1 mA
6.28 A
10 A
When a full band of frequencies is allowed to pass through a filter circuit to the output, the resonant circuit is called a:
low-pass filter
high-pass filter
band-stop filter
bandpass filter
At resonance, the term bandwidth includes all frequencies that allow what percentage of maximum current to flow?
50
62.3
70.7
95.3
What is the voltage across the capacitor in the given circuit?
6.8 V
11.9 V
16.1 V
22.9 V
What is the impedance of the circuit in the given circuit?
1.05 kΩ
1.33 kΩ
2.19 kΩ
3.39 kΩ
In a series RLC circuit the current can be found using:
both of the a and b
none of the above
What is the true power consumed in a 30 V series RLC circuit if Z = 20 ohms and R = 10 ohms?
15.0 watts
22.5 watts
30.0 watts
45.0 watts
What is the current phase angle for a parallel RLC circuit when IL = 15.3 A, IC = 0.43 A, and IR = 3.5 A?
76.7 degrees
–4.25 degrees
88.8 degrees
–76.7 degrees
At any resonant frequency, what voltage is measured across the two series reactive components?
applied
reactive
zero
inductive and capacitive
What is the resonance frequency?
31.8 Hz
71 Hz
7.1 kHz
31.8 kHz
What is the bandwidth in the given circuit. If the winding resistance of the coil is 12Ω?
6.4 kHz
47.2 kHz
53.7 kHz
60.2 kHz
At any resonant frequency, what net voltage is measured across the two series reactive components?
Applied voltage
Reactive voltage
Zero voltage
VL + VC voltage
If the bandwidth of a filter increases:
Q decreases
the roll-off rate increases
the half-power frequency decreases
the center frequency decreases
Series RLC impedance or voltage totals must always be calculated by
adding values vectorially
graphing the angles
multiplying the values
subtracting the values
What is the current through the capacitor in the given circuit?
3.5 mA
5.5 mA
9 mA
11.4 mA
What is the total impedance of a 60 Hz series RLC circuit when XL = 7.5 ohms, XC = 265.3 ohms, and R = 33 ohms?
257.8 ohms
259.9 ohms
290.8 ohms
1989.75 ohms
What is the total current for the non ideal circuit in the given circuit. If it is at resonance?
0 A
284 μ A
3.3 mA
38.5 mA
What is the high cutoff frequency for an RLC circuit that resonates at 2000 Hz and has a bandwidth of 250 Hz?
2125 Hz
2250 Hz
1750 Hz
8.0 Hz
Current in a series RLC circuit may always be used as:
a leading vector
a reference
an angle
a lagging vector
What is the impedance of the circuit?
12.2 kΩ
14.5 kΩ
17.8 kΩ
20.3 kΩ
What is the resonant frequency in the given circuit?
6.5 kHz
53.7 kHz
107.4 kHz
18.1 MHz
What is the impedance of the circuit in the given circuit?
125.7 Ω
297.6 Ω
370.1 Ω
423.3 Ω
What is the approximate phase angle in a series RLC circuit when VC = 117 V, VR = 14.5 V, and VL = 3.3 V?
–45.0 degrees
–82.7 degrees
–90.0 degrees
–172.7 degrees
Which statement best describes reactance in a series RLC circuit?
Capacitive reactance is always dominant.
Inductive reactance is always dominant.
Resistance is always dominant.
The larger of the two reactances is dominant.
What is the band pass (F1 – F2) of an RLC filter that resonates at 150 kHz and has a coil Q of 30?
100.0 kHz to 155.0 kHz
147.5 kHz to 152.5 kHz
295.5 kHz to 4500 kHz
149,970 Hz to 150,030 Hz
What is the power factor?
0.279
0.479
0.679
0.879
What is the phase angle?
61.4º
28.5º
-28.5º
-61.4º
What would be the power factor for an RLC circuit that acts inductively?
+90 degrees leading
one
zero
–90 degrees lagging
Voltage lags current in an RLC circuit when it acts:
capacitively
resistively
inductively
resonantly
What is the bandwidth of the circuit in the given circuit?
11.6 Hz
275.9 Hz
1.5 kHz
3.2 kHz
What is the voltage across R1, C1, and L1?
VR = 156 V, VC = 165 V, VL = 441 V
VR = 178 V, VC = 187 V, VL = 503 V
VR = 219 V, VC = 232 V, VL = 619 V
VR = 260 V, VC = 276 V, VL = 735 V
If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth
Disappears
Becomes sharper
Increases
Decreases
To tune a parallel resonant circuit to a higher frequency, the capacitance should be
Increased
Decreased
Left alone
Replaced with inductance
A 15 Ω resistor, an inductor with 8 Ω inductive reactance, and a capacitor with 12 Ω capacitive reactance are in parallel across an ac voltage source. The circuit impedance is
12.7 Ω
127 Ω
4436 Ω
6174 Ω
A 12 Ω resistor, a 40 μF capacitor, and an 8 mH coil are in series across an ac source. The resonant frequency is
28.1 Hz
281 Hz
2810 Hz
10 kHz
In a series RLC circuit that is operating above the resonant frequency, the current
Lags the applied voltage
Leads the applied voltage
Is in phase with the applied voltage
Is zero
