MCQOPTIONS
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MCQOPTIONS
This section includes 28 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 |
| Answer» C. | |
| 2. |
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 |
| Answer» D. 42.4 A | |
| 3. |
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%! |
| A. | 12.60 ‚à †-76¬∞ mS |
| B. | 12.18 ‚à †76¬∞ mS |
| C. | 218 ‚à †-76¬∞ mS |
| D. | 12.18 ‚à †-76¬∞ mS |
| Answer» E. | |
| 4. |
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 |
| Answer» E. | |
| 5. |
In an RL circuit, the impedance is determined by both the resistance and the inductive reactance combined.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
The impedance of an RL circuit varies inversely with frequency.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
When the frequency is decreased, the impedance of a parallel RL circuit%! |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Is not a factor |
| Answer» C. Remains constant | |
| 8. |
When the frequency of the voltage applied to a series RL circuit is increased, the phase angle%! |
| A. | Decreases |
| B. | Increases |
| C. | Does not change |
| D. | Cannot be determined without values |
| Answer» C. Does not change | |
| 9. |
The resistor voltage in an RL circuit is always out of phase with the current.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 10. |
A filter passes certain frequencies and rejects others.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
When the frequency is decreased, the impedance of a parallel RL circuit Increases%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
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 |
| Answer» E. | |
| 13. |
To increase the current in a series RL circuit, the frequency%! |
| A. | Should be increased |
| B. | Should be decreased |
| C. | Should be constant |
| D. | Cannot be determined without values |
| Answer» C. Should be constant | |
| 14. |
The power factor indicates how much of the apparent power is reactive power.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 15. |
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%! |
| A. | 5.51 Ω |
| B. | 55.15 Ω |
| C. | 90 Ω |
| D. | 200 Ω |
| Answer» C. 90 ≈í¬© | |
| 16. |
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 |
| Answer» E. | |
| 17. |
The phase angle (?) of a series RL circuit varies directly with frequency.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 18. |
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%! |
| A. | 8.74 mA |
| B. | 874 mA |
| C. | 874 µA |
| D. | 8.74 µA |
| Answer» B. 874 mA | |
| 19. |
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 |
| Answer» B. Decreases | |
| 20. |
In an RL circuit, part of the power is resistive and part is reactive.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
Total current in an RL circuit always lags the source voltage.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 22. |
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%! |
| A. | 18.4 V |
| B. | 26.0 V |
| C. | 2 V |
| D. | 20 V |
| Answer» C. 2 V | |
| 23. |
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%! |
| A. | 564 |
| B. | 0.564 |
| C. | 6.76 |
| D. | 55.7 |
| Answer» C. 6.76 | |
| 24. |
*/*_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 |
| Answer» C. 6 VA | |
| 25. |
_ 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$? |
| A. | 47 ‚à †68.6¬∞ Œ© |
| B. | 120 ‚à †68.6¬∞ Œ© |
| C. | 129 ‚à †31.4¬∞ Œ© |
| D. | 129 ‚à †68.6¬∞ Œ© |
| Answer» E. | |
| 26. |
A 12 kŒ© resistor is in series with a 90 mH coil across an 8 kHz ac source. Current flow in the circuit, expressed in polar form, is I = 0.3 ‚à †0¬∞ mA. The source voltage, expressed in polar form, is$? |
| A. | 3.84 ‚à †20.6¬∞ V |
| B. | 12.8 ‚à †20.6¬∞ V |
| C. | 0.3 ‚à †20.6¬∞ V |
| D. | 13.84 ‚à †69.4¬∞ V |
| Answer» B. 12.8 ‚Äö√ ‚Ä 20.6¬¨‚àû V | |
| 27. |
When the frequency of the voltage applied to a series RL circuit is decreased, the impedance |
| A. | Decreases |
| B. | Increases |
| C. | Does not change |
| D. | Cannot be determined without values |
| Answer» B. Increases | |
| 28. |
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# |
| A. | 152.6 Ω |
| B. | 1,526 Ω |
| C. | 1,200 Ω |
| D. | 942 Ω |
| Answer» C. 1,200 ≈í¬© | |