MCQOPTIONS
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MCQOPTIONS
This section includes 31 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 0.00022 F capacitor equals how many micro-farads?~! |
| A. | 22 µF |
| B. | 220 µF |
| C. | 2,200 µF |
| D. | 22,200 µF |
| Answer» C. 2,200 ¬¨¬µF | |
| 2. |
Two series capacitors (one 2 µF, the other of unknown value) are charged from a 24 V source. The 2 µF capacitor is charged to 16 V and the other to 8 V. The value of the unknown capacitor is~! |
| A. | 1 µF |
| B. | 2 µF |
| C. | 4 µF |
| D. | 8 µF |
| Answer» D. 8 ¬¨¬µF | |
| 3. |
Total parallel capacitance is less than that of the smallest capacitor in parallel.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 4. |
An uncharged capacitor and a 1 kΩ resistor are connected in series with a switch and a 6 V battery. At the instant the switch is closed, the voltage across the capacitor is%! |
| A. | 6 V |
| B. | 3 V |
| C. | 2 V |
| D. | 0 V |
| Answer» E. | |
| 5. |
Capacitance is directly proportional to plate area and plate separation.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
XC is inversely proportional to frequency and capacitance.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
Energy is stored by a capacitor in a magnetic field.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
A capacitor of 2,000 pF is greater than%! |
| A. | 0.02 µF |
| B. | 0.002 µF |
| C. | 0.0002 µF |
| D. | 0.0000002 F |
| Answer» D. 0.0000002 F | |
| 9. |
A 0.47 µF capacitor is across a 2 kHz sine wave signal source. The capacitive reactance is%! |
| A. | 170 Ω |
| B. | 17 Ω |
| C. | 0.000169 Ω |
| D. | 1.7 Ω |
| Answer» B. 17 ≈í¬© | |
| 10. |
Five time constants are required for a capacitor to charge fully or discharge fully.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Two 0.68 µF capacitors are connected in series across a 10 kHz sine wave signal source. The total capacitive reactance is%! |
| A. | 46.8 Ω |
| B. | 4.68 Ω |
| C. | 23.41 Ω |
| D. | 11.70 Ω |
| Answer» B. 4.68 ≈í¬© | |
| 12. |
Voltage leads current by 90° in a capacitor.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
A capacitor blocks A.C. but passes D.C.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 14. |
What is the capacitance when Q = 60 µC and V = 12 V?%! |
| A. | 720 µF |
| B. | 5 µF |
| C. | 50 µF |
| D. | 12 µF |
| Answer» C. 50 ¬¨¬µF | |
| 15. |
The true power in a capacitor is zero.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 16. |
A 330 pF capacitor and a 220 pF capacitor are each connected across a 6 V dc source. The voltage across the 330 pF capacitor is%! |
| A. | 3 V |
| B. | 6 V |
| C. | 4 V |
| D. | 0 V |
| Answer» C. 4 V | |
| 17. |
A capacitor of 0.02 µF is larger than%! |
| A. | 0.000020 F |
| B. | 200,000 pF |
| C. | 2,000 pF |
| D. | All of the above |
| Answer» D. All of the above | |
| 18. |
A 0.01 µF capacitor equals how many picofarads?%! |
| A. | 100 pF |
| B. | 1,000 pF |
| C. | 10,000 pF |
| D. | 100,000 pF |
| Answer» D. 100,000 pF | |
| 19. |
The ohm is the unit of capacitance.%! |
| A. | True |
| B. | False |
| Answer» C. | |
| 20. |
The dielectric constant is the ability of a material to establish an electric field.%! |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
Four 0.15 µF capacitors are in parallel. The total capacitance is%! |
| A. | 0.15 µF |
| B. | 0.30 µF |
| C. | 0.6 µF |
| D. | 0.8 µF |
| Answer» D. 0.8 ¬¨¬µF | |
| 22. |
A capacitor and a resistor are connected in series to a sine wave generator. The frequency is set so that the capacitive reactance is equal to the resistance and, thus, an equal amount of voltage appears across each component. If the frequency is increased%! |
| A. | VR > VC |
| B. | VC > VR |
| C. | VR = VC |
| D. | VR and VC = 0 |
| Answer» B. VC > VR | |
| 23. |
A 10 µF, 20 µF, 22 µF, and 100 µF capacitor are in parallel. The total capacitance is%! |
| A. | 2.43 µF |
| B. | 4.86 µF |
| C. | 100 µF |
| D. | 152 µF |
| Answer» E. | |
| 24. |
Of the following capacitors, which one has the highest dielectric constant?%! |
| A. | Air |
| B. | Mica |
| C. | Glass |
| D. | Paper |
| Answer» D. Paper | |
| 25. |
A 4.7 MΩ resistor is in series with a 0.015 µF capacitor. The combination is across a 12 V source. How long does it take the capacitor to fully charge?%! |
| A. | 35 ms |
| B. | 352 ms |
| C. | 3.5 ms |
| D. | 70.5 ms |
| Answer» C. 3.5 ms | |
| 26. |
When the voltage across a capacitor is tripled, the stored charge%! |
| A. | Triples |
| B. | Is cut to one-third |
| C. | Stays the same |
| D. | Doubles |
| Answer» B. Is cut to one-third | |
| 27. |
A 220 Ω resistor is in series with a 2.2 µF capacitor. The time constant is%! |
| A. | 48 µs |
| B. | 480 µs |
| C. | 2.42 µs |
| D. | 24 µs |
| Answer» C. 2.42 ¬¨¬µs | |
| 28. |
*/*_A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current? |
| A. | Increases |
| B. | Remains constant |
| C. | Decreases |
| D. | Ceases |
| Answer» D. Ceases | |
| 29. |
_ Which of the following capacitors is polarized?$? |
| A. | Mica |
| B. | Ceramic |
| C. | Plastic-film |
| D. | Electrolytic |
| Answer» E. | |
| 30. |
_A 2 µF, a 4 µF, and a 10 µF capacitor are connected in series. The total capacitance is less than$? |
| A. | 2 µF |
| B. | 4 µF |
| C. | 10 µF |
| D. | 1.5 µF |
| Answer» E. | |
| 31. |
A 12 kHz voltage is applied to a 0.33 µF capacitor, and 200 mA of rms current is measured. What is the value of the voltage?# |
| A. | 8 V |
| B. | 80 V |
| C. | 800 V |
| D. | 0.88 V |
| Answer» B. 80 V | |