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Electrical Engineering
RL Circuits
Quiz 1
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Q.1
Which of the following power factors results in less energy loss in an RL circuit?
1
0.8
0.4
0.2
Q.2
A 470 Ω resistor and a 200 mH coil are in parallel. Both components are across a 1.5 kHz ac source. The total admittance of the circuit, in polar form, is
12.60 ∠-76° mS
12.18 ∠76° mS
218 ∠-76° mS
12.18 ∠-76° mS
Q.3
To increase the current in a series RL circuit, the frequency
Should be increased
Should be decreased
Should be constant
Cannot be determined without values
Q.4
When the frequency is decreased, the impedance of a parallel RL circuit Increases
True
False
Q.5
In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is
6 A
424 mA
4.24 A
42.4 A
Q.6
A power factor of 1 indicates a purely reactive circuit, and a power factor of 0 indicates a purely resistive circuit.
True
False
Q.7
In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is
18.4 V
26.0 V
2 V
20 V
Q.8
A 1.2 kΩ resistor is in series with a 15 mH coil across a 10 kHz ac source. The magnitude of the total impedance is
152.6 Ω
1,526 Ω
1,200 Ω
942 Ω
Q.9
The resistor voltage in an RL circuit is always out of phase with the current.
True
False
Q.10
When the frequency of the voltage applied to a series RL circuit is increased, the phase angle
Decreases
Increases
Does not change
Cannot be determined without values
Q.11
A 1.5 kΩ resistor and a coil with a 2.2 kΩ inductive reactance are in series across an 18 V ac source. The power factor is
564
0.564
6.76
55.7
Q.12
In an RL circuit, part of the power is resistive and part is reactive.
True
False
Q.13
A 3.3 kΩ resistor and a 120 mH coil are in parallel. Both components are across a 2 kHz, 12 V ac source. The total current in the circuit is
8.74 mA
874 mA
874 µA
8.74 µA
Q.14
A 470 Ω resistor and a coil with 125 Ω inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is
152 mA
32 mA
12 mA
120 mA
Q.15
When the frequency of the voltage applied to a series RL circuit is decreased, the impedance
Decreases
Increases
Does not change
Cannot be determined without values
Q.16
A 12 kΩ resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3 ∠0° mA. The source voltage, expressed in polar form, is
3.84 ∠20.6° V
12.8 ∠20.6° V
0.3 ∠20.6° V
13.84 ∠69.4° V
Q.17
A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed in polar form, is
47 ∠68.6° Ω
120 ∠68.6° Ω
129 ∠31.4° Ω
129 ∠68.6° Ω
Q.18
The impedance of an RL circuit varies inversely with frequency.
True
False
Q.19
Total current in an RL circuit always lags the source voltage.
True
False
Q.20
When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle
Increases
Decreases
Is not affected
Cannot be determined
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