MCQOPTIONS
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MCQOPTIONS
This section includes 216 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Calculate the energy in the 2F capacitor. |
| A. | 8.6kJ |
| B. | 64kJ |
| C. | 64J |
| D. | 6.4kJ |
| Answer» E. | |
| 152. |
Calculate the voltage across AB if the total charge stored in the combination is 13C. |
| A. | 1V |
| B. | 2V |
| C. | 3V |
| D. | 4V |
| Answer» B. 2V | |
| 153. |
Calculate the charge in the 2F capacitor. |
| A. | 200C |
| B. | 100C |
| C. | 300C |
| D. | 400C |
| Answer» B. 100C | |
| 154. |
What is the voltage across the capacitor if the switch is closed and steady state is reached? |
| A. | 8V |
| B. | 0V |
| C. | 10V |
| D. | Infinity |
| Answer» D. Infinity | |
| 155. |
Calculate the total capacitance. |
| A. | 10F |
| B. | 15F |
| C. | 13F |
| D. | 20F |
| Answer» D. 20F | |
| 156. |
Calculate the charge in the 1F capacitor. |
| A. | 200C |
| B. | 100C |
| C. | 300C |
| D. | 400C |
| Answer» C. 300C | |
| 157. |
Calculate the capacitance of a capacitor that stores 40microC of charge and has a voltage of 2V. |
| A. | 20F |
| B. | 20microF |
| C. | 10F |
| D. | 10microF |
| Answer» C. 10F | |
| 158. |
What happens to the capacitance when the voltage across the capacitor increases? |
| A. | Decreases |
| B. | Increases |
| C. | Becomes 0 |
| D. | No effect |
| Answer» E. | |
| 159. |
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 | |
| 160. |
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 | |
| 161. |
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 | |
| 162. |
The total voltage drop across a series of capacitors is __________ |
| A. | The voltage drop across any one of the capacitors |
| B. | The sum of the voltage drop across each of the capacitors |
| C. | The product of the voltage drop across each of the capacitors |
| D. | Zero |
| Answer» C. The product of the voltage drop across each of the capacitors | |
| 163. |
What will happen to the capacitor just after the source is removed? |
| A. | It will not remain in its charged state |
| B. | It will remain in its charged state |
| C. | It will start discharging |
| D. | It will become zero |
| Answer» C. It will start discharging | |
| 164. |
Capacitance is directly proportional to__________ |
| A. | Area of cross section between the plates |
| B. | Distance of separation between the plates |
| C. | Both area and distance |
| D. | Neither area nor distance |
| Answer» B. Distance of separation between the plates | |
| 165. |
Which among the following equations is incorrect? |
| A. | Q=CV |
| B. | Q=C/V |
| C. | V=Q/C |
| D. | C=Q/V |
| Answer» C. V=Q/C | |
| 166. |
Two capacitors having capacitance value 4F, three capacitors having capacitance value 2F and 5 capacitors having capacitance value 1F are connected in parallel, calculate the equivalent capacitance. |
| A. | 20F |
| B. | 19F |
| C. | 18F |
| D. | 17F |
| Answer» C. 18F | |
| 167. |
Three capacitors having a capacitance equal to 2F, 4F and 6F are connected in parallel. Calculate the effective parallel. |
| A. | 10F |
| B. | 11F |
| C. | 12F |
| D. | 13F |
| Answer» D. 13F | |
| 168. |
If the charge in a conductor is 16C and the area of cross section is 4m2. Calculate the electric flux density. |
| A. | 64C/m2 |
| B. | 16C/m2 |
| C. | 4C/m2 |
| D. | 2C/m2 |
| Answer» D. 2C/m2 | |
| 169. |
The insulant between the two plates of a capacitor is called _______ |
| A. | Conductor |
| B. | Semi-conductor |
| C. | Dielectric |
| D. | Superconductor |
| Answer» D. Superconductor | |
| 170. |
What is the electric flux density in free space if the electric field intensity is 1V/m? |
| A. | 7.76*10-12C/m2 |
| B. | 8.85*10-12C /m2 |
| C. | 1.23*10-12C /m2 |
| D. | 3.43*10-12C /m2 |
| Answer» C. 1.23*10-12C /m2 | |
| 171. |
For which medium capacitance is high? |
| A. | Air |
| B. | Mica |
| C. | Water |
| D. | Metal |
| Answer» E. | |
| 172. |
What happens when one material is rubbed against another? |
| A. | The material becomes electrically neutral |
| B. | The material becomes electrically charged |
| C. | The material becomes negatively charged |
| D. | The material becomes positively charged |
| Answer» C. The material becomes negatively charged | |
| 173. |
Why does capacitor block dc signal at steady state? |
| A. | due to high frequency of dc signal |
| B. | due to zero frequency of dc signal |
| C. | capacitor doesnot pass any current at steady state |
| D. | due to zero frequency of dc signal |
| Answer» E. | |
| 174. |
If a parallel plate capacitor of plate area 2m2 and plate separation 1m store the charge of 1.77*10-11 C. What is the voltage across the capacitor? |
| A. | 1V |
| B. | 2V |
| C. | 3V |
| D. | 4V |
| Answer» B. 2V | |
| 175. |
Capacitor is a device used to__________ |
| A. | store electrical energy |
| B. | vary the resistance |
| C. | store magnetic energy |
| D. | dissipate energy |
| Answer» B. vary the resistance | |
| 176. |
Two 4F capacitors are connected in series, calculate the voltage across each if the total voltage is 20V. |
| A. | 10V |
| B. | 5V |
| C. | 20V |
| D. | 0V |
| Answer» B. 5V | |
| 177. |
Two capacitors having voltage 2F and 4F are connected in series. This combination is connected to a 100V supply, calculate the voltage across the 2F capacitor. |
| A. | 66.67V |
| B. | 33.33V |
| C. | 100V |
| D. | 0V |
| Answer» B. 33.33V | |
| 178. |
What is the value of capacitance of a capacitor which has a voltage of 4V and has 16C of charge? |
| A. | 2F |
| B. | 4F |
| C. | 6F |
| D. | 8F |
| Answer» C. 6F | |
| 179. |
Capacitor blocks__________ after long time. |
| A. | alternating current |
| B. | direct current |
| C. | both alternating and direct current |
| D. | neither alternating nor direct current |
| Answer» C. both alternating and direct current | |
| 180. |
Which of the following is a passive device? |
| A. | Transistor |
| B. | Rectifier |
| C. | Capacitor |
| D. | Vaccuum Tubes |
| Answer» D. Vaccuum Tubes | |
| 181. |
Capacitor stores which type of energy? |
| A. | kinetic energy |
| B. | vibrational energy |
| C. | potential energy |
| D. | heat energy |
| Answer» D. heat energy | |
| 182. |
Which medium has the highest dielectric strength? |
| A. | Water |
| B. | Mica |
| C. | Air |
| D. | Glass |
| Answer» D. Glass | |
| 183. |
If a large amount of voltage is applied to a capacitor, what is the current that flows through it? |
| A. | Displacement current |
| B. | Conduction current |
| C. | Both conduction and displacement current |
| D. | Neither conduction nor displacement current |
| Answer» C. Both conduction and displacement current | |
| 184. |
Under normal conditions capacitors have _________ |
| A. | Displacement current |
| B. | Conduction current |
| C. | Both conduction and displacement current |
| D. | Neither conduction nor displacement current |
| Answer» B. Conduction current | |
| 185. |
Which among the following is the correct expression for force between the plates of a parallel plate capacitor? |
| A. | F=epsilon*A*(V/x)2/2 |
| B. | F=epsilon*A*(V/x)2/3 |
| C. | F=epsilon (V/x)2/2 |
| D. | F=epsilon (V/x)2/3 |
| Answer» B. F=epsilon*A*(V/x)2/3 | |
| 186. |
A metal parallel plate capacitor has 100mm diameter and the distance between the plates is 1mm. The capacitor is placed in air. Calculate the potential difference between the plates if the force on each plate is 0.035N. |
| A. | 1kV |
| B. | 1V |
| C. | 2kV |
| D. | 2V |
| Answer» B. 1V | |
| 187. |
A metal parallel plate capacitor has 'a'mm diameter and the distance between the plates is 1mm. The capacitor is placed in air. Force on each plate is 0.035N and the potential difference between the plates is 1kV. Find 'a'. |
| A. | 10mm |
| B. | 100mm |
| C. | 1000m |
| D. | 1000cm |
| Answer» C. 1000m | |
| 188. |
A metal parallel plate capacitor has 100mm diameter and the distance between the plates is 'a' mm. The capacitor is placed in air. Force on each plate is 0.035N and the potential difference between the plates is 1kV. Find 'a'. |
| A. | 1m |
| B. | 1cm |
| C. | 10cm |
| D. | 1mm |
| Answer» E. | |
| 189. |
What happens to the force of attraction between the capacitors when the potential difference between the plates decreases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» C. Remains the same | |
| 190. |
What happens to the force of attraction between the capacitors when the distance of separation between the plates increases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» C. Remains the same | |
| 191. |
Find the capacitance of a multi plate capacitor whose actual permittivity= 5F/m, n=3, A=4m2and d=2m. |
| A. | 10F |
| B. | 20F |
| C. | 30F |
| D. | 40F |
| Answer» C. 30F | |
| 192. |
Find the capacitance of a multi plate capacitor whose relative permittivity=5, n=3, A=4m2 and d=2m. |
| A. | 1.77*10-10 F |
| B. | 1.77*1010 F |
| C. | 1.77*10-11 F |
| D. | 1.77*1011 F |
| Answer» B. 1.77*1010 F | |
| 193. |
Calculate the area of cross section of the multi plate capacitor having C=20F, actual permittivity=5F/m n=3 and d=2m. |
| A. | 1m2 |
| B. | 2m2 |
| C. | 3m2 |
| D. | 4m2 |
| Answer» E. | |
| 194. |
Calculate the number of plates in the multi plate capacitor having C=1.77*10-10F relative permittivity=5, A=4m2 and d=2m. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 195. |
Find the number of plates in the multi plate capacitor having C=20F absolute permittivity=5F/m, A=4m2 and d=2m. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 196. |
Calculate the distance between the plates of the capacitor having C=20F, actual permittivity = 5F/m n=3 and A=4m2. |
| A. | 1m |
| B. | 2m |
| C. | 3m |
| D. | 4m |
| Answer» C. 3m | |
| 197. |
The discharging time constant of a circuit consisting of a capacitor is the time taken for the charge in the capacitor to become __________ % of the initial charge. |
| A. | 33 |
| B. | 63 |
| C. | 37 |
| D. | 36 |
| Answer» D. 36 | |
| 198. |
While charging, what happens to the current in the capacitive circuit? |
| A. | Decreases linearly |
| B. | Increases linearly |
| C. | Decreases exponentially |
| D. | Increases exponentially |
| Answer» D. Increases exponentially | |
| 199. |
While charging, what happens to the voltage in the capacitive circuit? |
| A. | Decreases linearly |
| B. | Increases linearly |
| C. | Decreases exponentially |
| D. | Increases exponentially |
| Answer» E. | |
| 200. |
An 8microF capacitor is connected in series with a 0.5 megaohm resistor. The DC voltage supply is 200V. Calculate the time constant. |
| A. | 1s |
| B. | 2s |
| C. | 3s |
| D. | 4s |
| Answer» E. | |