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.
| 151. |
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 | |
| 152. |
Which material has the highest dielectric strength? |
| A. | Air |
| B. | Paper |
| C. | Mica |
| D. | Oil |
| Answer» D. Oil | |
| 153. |
What is the dielectric constant for ceramic? |
| A. | between 6 and 8000 |
| B. | 5 |
| C. | between 5 and 1000 |
| D. | 3000 |
| Answer» B. 5 | |
| 154. |
A ___ capacitor allows ac signals to pass while blocking dc signals. |
| A. | filter |
| B. | bypass |
| C. | decoupling |
| D. | coupling |
| Answer» E. | |
| 155. |
If the reactive power of a circuit is 50 mW while the apparent power is 64 mW, then what is the true power of the circuit? |
| A. | 14 mW |
| B. | 36 mW |
| C. | 40 mW |
| D. | 114 mW |
| Answer» D. 114 mW | |
| 156. |
How is ac current related to ac voltage in a purely capacitive circuit? |
| A. | AC current is 0.707 of the ac voltage. |
| B. | AC current lags ac voltage. |
| C. | AC current is 0.637 of the ac voltage. |
| D. | AC current leads ac voltage. |
| Answer» E. | |
| 157. |
The strength of an electric field at a given point is proportional to the potential difference on the plates and inversely proportional to the: |
| A. | plate separation |
| B. | negative plate only |
| C. | field strength |
| D. | charge difference |
| Answer» B. negative plate only | |
| 158. |
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 | |
| 159. |
In a capacitive circuit, current flow is limited to |
| A. | charging periods |
| B. | discharging periods |
| C. | neither charging periods nor discharging periods |
| D. | both charging periods and discharging periods |
| Answer» E. | |
| 160. |
What is the reactive power in the given circuit? |
| A. | 0 VAR |
| B. | 691 VAR |
| C. | 44.23 mVAR |
| D. | 1.45 kVAR |
| Answer» D. 1.45 kVAR | |
| 161. |
Which of the following is the reference vector for parallel RC circuits? |
| A. | R |
| B. | I |
| C. | C |
| D. | V |
| Answer» E. | |
| 162. |
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 Vac source, what is the total circuit impedance? |
| A. | 10 |
| B. | 100 |
| C. | 1 k |
| D. | 1 M |
| Answer» D. 1 M | |
| 163. |
What is the voltage across a capacitor after being charged from a 100 V source for a period of one time constant? |
| A. | 37.8 V |
| B. | 38 V |
| C. | 63 V |
| D. | 101 V |
| Answer» D. 101 V | |
| 164. |
If a 5 V, 60 Hz voltage is applied to a 4.7 F capacitor, the circuit current will be ______ . |
| A. | 0.886 mA |
| B. | 8.86 mA |
| C. | 8.86 A |
| D. | 88.6 A |
| Answer» C. 8.86 A | |
| 165. |
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 Vac source? |
| A. | 27.3 degrees |
| B. | 62.7 degrees |
| C. | –27.3 degrees |
| D. | –62.7 degrees |
| Answer» D. ‚Äì62.7 degrees | |
| 166. |
What is the circuit's impedance? |
| A. | 1192 |
| B. | 843 |
| C. | 723 |
| D. | 511 |
| Answer» B. 843 | |
| 167. |
Select the equation below that represents the relationship between charge, capacitance, and voltage for a capacitor. |
| A. | Q = CV |
| B. | C = QV |
| C. | |
| Answer» B. C = QV | |
| 168. |
What will a 1 F capacitor store? |
| A. | one coulomb of charge |
| B. | 6.24 x 1012 electrons |
| C. | one volt |
| D. | one A of current |
| Answer» C. one volt | |
| 169. |
What is the phase shift between the voltage across the resistor and the voltage from the source? |
| A. | VR leads VS by 17° |
| B. | VR leads VS by 73° |
| C. | VR lags VS by 73° |
| D. | VR lags VS by 17° |
| Answer» C. VR lags VS by 73¬∞ | |
| 170. |
What is the capacitive reactance if I = 1 amp, V = 2 volts, C = 5 F, and frequency = 10 Hz? |
| A. | 0.2 |
| B. | 0.5 |
| C. | 0.02 |
| D. | 0.003 |
| Answer» E. | |
| 171. |
How long would it take the capacitor in the given circuit to completely charge if the switch was in position 1? |
| A. | 22 ms |
| B. | 69 ms |
| C. | 345 ms |
| D. | 440 ms |
| Answer» D. 440 ms | |
| 172. |
A capacitor and an output resistor form a series circuit with a square wave applied. The circuit is: |
| A. | an integrator |
| B. | a differentiator |
| C. | a multiplier |
| D. | a divider |
| Answer» C. a multiplier | |
| 173. |
A capacitor's rate of charge is considered: |
| A. | magnetic |
| B. | a current block |
| C. | linear |
| D. | exponential |
| Answer» E. | |
| 174. |
When is a capacitor fully charged? |
| A. | when the voltage across its plates is of the voltage from ground to one of its plates |
| B. | when the current through the capacitor is the same as when the capacitor is discharged |
| C. | when the voltage across the plates is 0.707 of the input voltage |
| D. | when the current through the capacitor is directly proportional to the area of the plates |
| Answer» C. when the voltage across the plates is 0.707 of the input voltage | |
| 175. |
Capacitive reactance is inversely proportional with frequency. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 176. |
If C1, a 4.7 F capacitor, and C2, a 3.3 F capacitor are in series with 18 Vdc applied, what is the voltage across C1? |
| A. | 3.3 V |
| B. | 7.4 V |
| C. | 6.6 V |
| D. | 9.4 V |
| Answer» C. 6.6 V | |
| 177. |
In a 20 Vac 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 | |