MCQOPTIONS
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MCQOPTIONS
This section includes 177 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If a current of 40 mA flows through a series circuit consisting of a 0.4 F capacitor and a resistor in series with a 4 kHz, 40 V source, what is the total circuit impedance? |
| A. | 10 |
| B. | 100 |
| C. | 1 k |
| D. | 1 M |
| Answer» D. 1 M | |
| 2. |
If C, a 4.7 F capacitor, and C, a 3.3 F capacitor are in series with 18 V applied, what is the voltage across C? |
| A. | 3.3 V |
| B. | 7.4 V |
| C. | 6.6 V |
| D. | 9.4 V |
| Answer» C. 6.6 V | |
| 3. |
What is the impedance of a series RC circuit that consists of a 0.22 F capacitor and a 200-ohm resistor connected to a 3 kHz source? |
| A. | 214 ohms |
| B. | 313 ohms |
| C. | 414 ohms |
| D. | 880 ohms |
| Answer» C. 414 ohms | |
| 4. |
In a 20 V series RC circuit, if 20 V is measured across the resistor and 40 V is measured across the capacitor, the applied voltage is: |
| A. | 45 V |
| B. | 50 V |
| C. | 55 V |
| D. | 60 V |
| Answer» B. 50 V | |
| 5. |
What is the angle theta value for a 5.6 F capacitor and a 50-ohm resistor in series with a 1.1 kHz, 5 V source? |
| A. | 27.3 degrees |
| B. | 62.7 degrees |
| C. | –27.3 degrees |
| D. | –62.7 degrees |
| Answer» D. –62.7 degrees | |
| 6. |
When a 4.7 F capacitor is connected to a 1 kHz source, what is its capacitive reactance? |
| A. | 4.7 ohms |
| B. | 29.5 ohms |
| C. | 34 ohms |
| D. | 213 ohms |
| Answer» D. 213 ohms | |
| 7. |
You could increase the time constant of an circuit by |
| A. | adding a resistor in parallel with the circuit resistance |
| B. | adding a capacitor in parallel with the circuit capacitance |
| C. | increasing the amplitude of the input voltage |
| D. | exchanging the position of the resistor and capacitor in the circuit |
| Answer» C. increasing the amplitude of the input voltage | |
| 8. |
The phase angle of an RC series circuit is = invtan (X/R) = invtan (V/V). |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
The true power in an RC series circuit is P = I x R. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 10. |
With a 500 kHz signal source, what would be the value of a capacitor yielding a capacitive reactance of 1 k ? |
| A. | 318 pF |
| B. | 2 nF |
| C. | 3.18 |
| D. | F |
| E. | 2 F |
| Answer» B. 2 nF | |
| 11. |
The impedance of an RC series circuit is (R +C). |
| A. | True |
| B. | False |
| Answer» C. | |
| 12. |
The unit of capacitance is a farad; one farad stores one coulomb of charge or 6.24 x 10 electrons. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
The impedance in an RC parallel circuit is |
| A. | True |
| B. | False |
| Answer» C. | |
| 14. |
In an RC series circuit V = V + V. |
| A. | True |
| B. | False |
| Answer» C. | |
| 15. |
A 10 F capacitor will have more capacitive reactance than a 20 F capacitor in a 60 Hz circuit. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 16. |
A capacitor has 25 V across its plates and a stored charge of 1500 C. What is the capacitance value? |
| A. | 60 pF |
| B. | 60 |
| C. | F |
| D. | 16.67 mF |
| E. | 37.5 mF |
| Answer» C. F | |
| 17. |
The term integrator is derived from a mathematical function in trigonometry. |
| A. | True |
| B. | False |
| Answer» C. | |
| 18. |
A capacitor blocks ac but passes dc. |
| A. | True |
| B. | False |
| Answer» C. | |
| 19. |
A 220 resistor is in series with a 2.2 F capacitor. The time constant is |
| A. | 48 s |
| B. | 480 s |
| C. | 2.42 s |
| D. | 24 s |
| Answer» C. 2.42 s | |
| 20. |
Capacitance increases with __________ |
| A. | Increase in distance between the plates |
| B. | Decrease in plate area |
| C. | Decrease in distance between the plates |
| D. | Increase in density of the material |
| Answer» D. Increase in density of the material | |
| 21. |
Capacitance increases with ________ |
| A. | Increase in plate area |
| B. | Decrease in plate area |
| C. | Increase in distance between the plates |
| D. | Increase in density of the material |
| Answer» B. Decrease in plate area | |
| 22. |
Capacitor preferred when there is high frequency in the circuits is __________ |
| A. | Electrolyte capacitor |
| B. | Mica capacitor |
| C. | Air capacitor |
| D. | Glass capacitor |
| Answer» C. Air capacitor | |
| 23. |
A capacitor consists of_________ |
| A. | Two conductors |
| B. | Two semiconductors |
| C. | Two dielectrics |
| D. | Two insulators |
| Answer» B. Two semiconductors | |
| 24. |
For very low frequencies, capacitor acts as ________ |
| A. | Open circuit |
| B. | Short circuit |
| C. | Amplifier |
| D. | Rectifier |
| Answer» B. Short circuit | |
| 25. |
For high frequencies, capacitor acts as _________ |
| A. | Open circuit |
| B. | Short circuit |
| C. | Amplifier |
| D. | Rectifier |
| Answer» C. Amplifier | |
| 26. |
A 4microF capacitor is charged to 120V, the charge in the capacitor would be? |
| A. | 480C |
| B. | 480microC |
| C. | 30C |
| D. | 30microC |
| Answer» C. 30C | |
| 27. |
Calculate the current in the capacitor having 2V supply voltage and 3F capacitance in 2seconds. |
| A. | 2A |
| B. | 5A |
| C. | 6A |
| D. | 3A |
| Answer» E. | |
| 28. |
If 2V is supplied to a 3F capacitor, calculate the charge stored in the capacitor. |
| A. | 1.5C |
| B. | 6C |
| C. | 2C |
| D. | 3C |
| Answer» C. 2C | |
| 29. |
What is the relation between current and voltage in a capacitor? |
| A. | I=1/C*integral(Vdt) |
| B. | I=CdV/dt |
| C. | I=1/CdV/dt |
| D. | I=Ct |
| Answer» C. I=1/CdV/dt | |
| 30. |
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 | |
| 31. |
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 | |
| 32. |
The ohm is the unit of capacitance. |
| A. | True |
| B. | False |
| Answer» C. | |
| 33. |
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 | |
| 34. |
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. | |
| 35. |
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 | |
| 36. |
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 | |
| 37. |
Total parallel capacitance is less than that of the smallest capacitor in parallel. |
| A. | True |
| B. | False |
| Answer» C. | |
| 38. |
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. | |
| 39. |
Capacitance is directly proportional to plate area and plate separation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 40. |
XC is inversely proportional to frequency and capacitance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 41. |
Energy is stored by a capacitor in a magnetic field. |
| A. | True |
| B. | False |
| Answer» C. | |
| 42. |
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 Ω | |
| 43. |
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 Ω | |
| 44. |
A capacitor blocks A.C. but passes D.C. |
| A. | True |
| B. | False |
| Answer» C. | |
| 45. |
The true power in a capacitor is zero. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 46. |
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 | |
| 47. |
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 | |
| 48. |
The dielectric constant is the ability of a material to establish an electric field. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 49. |
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 | |
| 50. |
Of the following capacitors, which one has the highest dielectric constant? |
| A. | Air |
| B. | Mica |
| C. | Glass |
| D. | Paper |
| Answer» D. Paper | |