Rl Circuits(Engineering > Electrical Engineering ) Questions and Answers
Question 1. If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit
Doubles
Halves
Remains constant
Cannot be determined without values
Explanation:-
Answer: Option D. -> Cannot be determined without values
Question 2. When the frequency of the voltage applied to a series RL circuit is decreased, the impedance decreases
True
False
Explanation:-
Answer: Option A. -> True
Question 3. A filter passes certain frequencies and rejects others.
True
False
Explanation:-
Answer: Option A. -> True
Question 4. In an RL circuit, the impedance is determined by both the resistance and the inductive reactance combined.
True
False
Explanation:-
Answer: Option A. -> True
Question 5. When the frequency is decreased, the impedance of a parallel RL circuit
Increases
Decreases
Remains constant
Is not a factor
Explanation:-
Answer: Option B. -> Decreases
Question 6. 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
Explanation:-
Answer: Option B. -> 0.564
Question 7. Total current in an RL circuit always lags the source voltage.
True
False
Explanation:-
Answer: Option A. -> True
Question 8. 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
Explanation:-
Answer: Option A. -> Increases
Question 9. The phase angle (?) of a series RL circuit varies directly with frequency.
True
False
Explanation:-
Answer: Option A. -> True
Question 10. A 140 Ω resistor is in parallel with an inductor having 60 Ω inductive reactance. Both components are across a 12 V ac source. The magnitude of the total impedance is