RL Circuits online Practice Test - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle
(A) Increases
(B) Decreases
(C) Is not affected
(D) Cannot be determined

2. If a load is purely inductive and the reactive power is 12 VAR, the apparent power is
(A) 0 VA
(B) 12 VA
(C) 6 VA
(D) 24 VA

3. 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
(A) 152 mA
(B) 32 mA
(C) 12 mA
(D) 120 mA

4. A power factor of 1 indicates a purely reactive circuit, and a power factor of 0 indicates a purely resistive circuit.
(A) True
(B) False

5. When the frequency is decreased, the impedance of a parallel RL circuit
(A) Increases
(B) Decreases
(C) Remains constant
(D) Is not a factor

6. 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
(A) 6 A
(B) 424 mA
(C) 4.24 A
(D) 42.4 A

7. In an RL circuit, part of the power is resistive and part is reactive.
(A) True
(B) False

8. Which of the following power factors results in less energy loss in an RL circuit?
(A) 1
(B) 0.8
(C) 0.4
(D) 0.2

9. If the frequency is halved and the resistance is doubled, the impedance of a series RL circuit
(A) Doubles
(B) Halves
(C) Remains constant
(D) Cannot be determined without values

10. When the frequency of the voltage applied to a series RL circuit is decreased, the impedance decreases
(A) True
(B) False

Show and hide multiple DIV using JavaScript View All Answers

Blogger Comment