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Quiz

Lesson 2: Combined RLC Circuits, Impedance and Electrical Resonance — Picture questions (exam style)

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  • Questions count: 65
  • Passing grade: 60%
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1.
Series RLC (R = 40 Ω, X_L = 120 Ω, X_C = 120 Ω) on 100 V rms. Which option is correct?
Series RLC (R = 40 Ω, X_L = 120 Ω, X_C = 120 Ω) on 100 V rms. Which option is correct?
Z = 40 Ω, resistive (resonance), true power = 250 W
Z = 40 Ω, capacitive (I leads V), true power = 250 W
Z = 174 Ω, resistive (resonance), true power = 250 W
Z = 280 Ω, resistive (resonance), true power = 250 W
2.
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 4. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 4. Which option is correct?
resonant frequency × 2, maximum current at resonance unchanged
resonant frequency × 2, maximum current at resonance increases
resonant frequency × 1, maximum current at resonance unchanged
resonant frequency × 2, maximum current at resonance decreases
3.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
144 V
200 V
240 V
162 V
4.
What capacitance with a 0.2 H inductor gives resonance at 1000 Hz? (see resonance curve)
What capacitance with a 0.2 H inductor gives resonance at 1000 Hz? (see resonance curve)
796 μF
0.127 μF
5.00 μF
0.253 μF
5.
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 9. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 9. Which option is correct?
resonant frequency × 3/2, maximum current at resonance unchanged
resonant frequency × 4/3, maximum current at resonance unchanged
resonant frequency × 2/3, maximum current at resonance increases
resonant frequency × 2/3, maximum current at resonance unchanged
6.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
180 V
260 V
220 V
161 V
7.
A tuned (LC) circuit: L = 0.2 H, C = 20.0 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.2 H, C = 20.0 μF. Find the resonant frequency.
39800 Hz
500 Hz
138 Hz
79.6 Hz
8.
In an RLC resonant circuit (fixed R and V) L is multiplied by 9 and C by 2. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 9 and C by 2. Which option is correct?
resonant frequency × 2/9, maximum current at resonance unchanged
resonant frequency × 5/11, maximum current at resonance unchanged
resonant frequency × 2/9, maximum current at resonance increases
resonant frequency × 17/4, maximum current at resonance increases
9.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
120 V
92.7 V
84.9 V
140 V
10.
What capacitance with a 0.2 H inductor gives resonance at 50 Hz? (see resonance curve)
What capacitance with a 0.2 H inductor gives resonance at 50 Hz? (see resonance curve)
50.7 μF
15900 μF
2000 μF
101 μF
11.
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 0.25. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 0.25. Which option is correct?
resonant frequency × 1/4, maximum current at resonance decreases
resonant frequency × 4, maximum current at resonance decreases
resonant frequency × 4, maximum current at resonance unchanged
resonant frequency × 1/4, maximum current at resonance unchanged
12.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
123 V
56.6 V
200 V
80.0 V
13.
A tuned (LC) circuit: L = 0.2 H, C = 10.0 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.2 H, C = 10.0 μF. Find the resonant frequency.
196 Hz
707 Hz
113 Hz
79600 Hz
14.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
170 V
41.2 V
50.0 V
100 V
15.
A tuned (LC) circuit: L = 1 H, C = 10.0 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 1 H, C = 10.0 μF. Find the resonant frequency.
50.3 Hz
87.6 Hz
15900 Hz
316 Hz
16.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
112 V
190 V
80.6 V
90.0 V
17.
A tuned (LC) circuit: L = 0.05 H, C = 1.00 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.05 H, C = 1.00 μF. Find the resonant frequency.
4470 Hz
3.18×106 Hz
712 Hz
1240 Hz
18.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
80.0 V
58.3 V
116 V
180 V
19.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
120 V
200 V
84.9 V
123 V
20.
In an RLC resonant circuit (fixed R and V) L is multiplied by 2 and C by 2. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 2 and C by 2. Which option is correct?
resonant frequency × 1/4, maximum current at resonance unchanged
resonant frequency × 2, maximum current at resonance decreases
resonant frequency × 1/2, maximum current at resonance unchanged
resonant frequency × 1, maximum current at resonance unchanged
21.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
180 V
260 V
175 V
134 V
22.
A tuned (LC) circuit: L = 0.2 H, C = 100 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.2 H, C = 100 μF. Find the resonant frequency.
224 Hz
7960 Hz
61.9 Hz
35.6 Hz
23.
What capacitance with a 0.05 H inductor gives resonance at 100 Hz? (see resonance curve)
What capacitance with a 0.05 H inductor gives resonance at 100 Hz? (see resonance curve)
31800 μF
50.7 μF
2000 μF
101 μF
24.
What capacitance with a 0.05 H inductor gives resonance at 50 Hz? (see resonance curve)
What capacitance with a 0.05 H inductor gives resonance at 50 Hz? (see resonance curve)
405 μF
63700 μF
203 μF
8000 μF
25.
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 2. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 0.25 and C by 2. Which option is correct?
resonant frequency × 17/12, maximum current at resonance decreases
resonant frequency × 17/12, maximum current at resonance unchanged
resonant frequency × 17/12, maximum current at resonance increases
resonant frequency × 17/6, maximum current at resonance decreases
26.
In an RLC resonant circuit (fixed R and V) L is multiplied by 2 and C by 4. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 2 and C by 4. Which option is correct?
resonant frequency × 17/6, maximum current at resonance increases
resonant frequency × 4/11, maximum current at resonance increases
resonant frequency × 4/11, maximum current at resonance unchanged
resonant frequency × 17/6, maximum current at resonance decreases
27.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
105 V
94.9 V
140 V
120 V
28.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
170 V
100 V
90.0 V
67.1 V
29.
A tuned (LC) circuit: L = 0.2 H, C = 1.00 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.2 H, C = 1.00 μF. Find the resonant frequency.
2240 Hz
356 Hz
7.96×105 Hz
619 Hz
30.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
120 V
209 V
320 V
185 V
31.
What capacitance with a 0.02 H inductor gives resonance at 50 Hz? (see resonance curve)
What capacitance with a 0.02 H inductor gives resonance at 50 Hz? (see resonance curve)
1010 μF
507 μF
1.59×105 μF
20000 μF
32.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
120 V
136 V
210 V
130 V
33.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
200 V
139 V
134 V
180 V
34.
A tuned (LC) circuit: L = 0.02 H, C = 50.0 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.02 H, C = 50.0 μF. Find the resonant frequency.
1.59×105 Hz
159 Hz
277 Hz
1000 Hz
35.
A tuned (LC) circuit: L = 0.01 H, C = 4.00 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.01 H, C = 4.00 μF. Find the resonant frequency.
796 Hz
1380 Hz
5000 Hz
3.98×106 Hz
36.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
143 V
120 V
130 V
230 V
37.
In an RLC resonant circuit (fixed R and V) L is multiplied by 1 and C by 0.25. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 1 and C by 0.25. Which option is correct?
resonant frequency × 2, maximum current at resonance unchanged
resonant frequency × 4, maximum current at resonance decreases
resonant frequency × 1/2, maximum current at resonance decreases
resonant frequency × 2, maximum current at resonance decreases
38.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
133 V
180 V
160 V
144 V
39.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
85.4 V
110 V
150 V
96.4 V
40.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
260 V
140 V
175 V
108 V
41.
In an RLC resonant circuit (fixed R and V) L is multiplied by 9 and C by 9. Which option is correct?
In an RLC resonant circuit (fixed R and V) L is multiplied by 9 and C by 9. Which option is correct?
resonant frequency × 2/9, maximum current at resonance decreases
resonant frequency × 1/9, maximum current at resonance unchanged
resonant frequency × 1/9, maximum current at resonance decreases
resonant frequency × 0, maximum current at resonance decreases
42.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
80.0 V
64.8 V
100 V
56.6 V
43.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
114 V
110 V
85.4 V
190 V
44.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
67.1 V
110 V
50.0 V
70.0 V
45.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
189 V
156 V
220 V
300 V
46.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
210 V
150 V
230 V
157 V
47.
A tuned (LC) circuit: L = 0.01 H, C = 20.0 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.01 H, C = 20.0 μF. Find the resonant frequency.
7.96×105 Hz
619 Hz
356 Hz
2240 Hz
48.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
110 V
146 V
250 V
85.4 V
49.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
134 V
380 V
180 V
224 V
50.
A tuned (LC) circuit: L = 0.02 H, C = 100 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.02 H, C = 100 μF. Find the resonant frequency.
113 Hz
79600 Hz
707 Hz
196 Hz
51.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
90.0 V
170 V
80.6 V
102 V
52.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
90.0 V
67.1 V
130 V
80.6 V
53.
A tuned (LC) circuit: L = 0.05 H, C = 4.00 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.05 H, C = 4.00 μF. Find the resonant frequency.
619 Hz
2240 Hz
7.96×105 Hz
356 Hz
54.
A tuned (LC) circuit: L = 0.01 H, C = 2.00 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.01 H, C = 2.00 μF. Find the resonant frequency.
1960 Hz
7.96×106 Hz
7070 Hz
1130 Hz
55.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
290 V
150 V
171 V
124 V
56.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
200 V
172 V
240 V
152 V
57.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
120 V
170 V
128 V
190 V
58.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
200 V
290 V
270 V
192 V
59.
A tuned (LC) circuit: L = 1 H, C = 4.00 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 1 H, C = 4.00 μF. Find the resonant frequency.
138 Hz
39800 Hz
79.6 Hz
500 Hz
60.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
94.3 V
170 V
108 V
130 V
61.
What capacitance with a 0.02 H inductor gives resonance at 100 Hz? (see resonance curve)
What capacitance with a 0.02 H inductor gives resonance at 100 Hz? (see resonance curve)
253 μF
5000 μF
127 μF
79600 μF
62.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
90.0 V
67.1 V
230 V
136 V
63.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
189 V
300 V
180 V
128 V
64.
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
The phasor diagram shows the rms p.d.s across R, L and C in a series circuit. What is the rms supply voltage?
180 V
163 V
200 V
153 V
65.
A tuned (LC) circuit: L = 0.01 H, C = 100 μF. Find the resonant frequency.
A tuned (LC) circuit: L = 0.01 H, C = 100 μF. Find the resonant frequency.
1.59×105 Hz
277 Hz
159 Hz
1000 Hz
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