rl-circuits electronics question and answers -Page 3

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RL Circuits problems

1. In a series RL circuit, a power factor of 0.5 results in less energy conversion to heat than does a power factor of 0.6.
Options
A. True
B. False

Correct Answer: True

2. Phase angle is the difference in phase between the applied voltage (VS) and the circuit current (I_T).
Options
A. True
B. False

Correct Answer: True

3. As the frequency increases in a series RL circuit the impedance also increases.
Options
A. True
B. False

Correct Answer: True

4. The phase angle will increase in a parallel RL circuit if the resistance is increased.
Options
A. True
B. False

Correct Answer: True

5. The frequency at which X_L = R in an RL circuit is called the _______________.
Options
A. cutoff frequency
B. optimum frequency
C. bandwidth characteristic
D. resonant frequency

Correct Answer: cutoff frequency

6. The impedance of a series circuit when R = 15 kΩ and X_L = 10 kΩ is approximately equal to ________.
Options
A. 5 kΩ
B. 6 kΩ
C. 18 kΩ
D. 25 kΩ

Correct Answer: 18 kΩ

7.
If V_S increases in the given circuit, then the _____.
Options
A. impedance increases
B. real power decreases
C. phase angle increases
D. current increases

Correct Answer: current increases

8.
If the frequency decreases in the given circuit, then _____.
Options
A. I_T decreases
B. I_R increases
C. I_L increases
D. none of the currents will change

Correct Answer: I_L increases

9.
In the circuit given is, _____.
Options
A. V_R leads V_L
B. V_R lags V_L
C. V_R is in phase with V_L
D. V_R, V_L, and V_S are all in phase

Correct Answer: V_R leads V_L

10.
The impedance of the circuit in the given circuit is approximately equal to _____.
Options
A. 2 kΩ
B. 750 Ω
C. 1.25 kΩ
D. 1 kΩ

Correct Answer: 1.25 kΩ

First 2 3 4

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