McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 151. |
Compute the refractive index when the dielectric constant is 256 in air. |
| A. | 2562 |
| B. | 16 |
| C. | 256 |
| D. | 64 |
| Answer» B. 16 | |
| 152. |
Curie-Weiss law is applicable to which of the following materials? |
| A. | piezoelectric |
| B. | ferroelectric |
| C. | pyroelectric |
| D. | anti-ferroelectric |
| Answer» B. ferroelectric | |
| 153. |
Curie-Weiss law is used to calculate which one of the following? |
| A. | permittivity |
| B. | permeability |
| C. | electric susceptibility |
| D. | magnetic susceptibility |
| Answer» C. electric susceptibility | |
| 154. |
Calculate the loss tangent when the dielectric constant in AC field is given by 3 + 2j. |
| A. | (2/3) |
| B. | (3/2) |
| C. | (-3/2) |
| D. | (-2/3) |
| Answer» D. (-2/3) | |
| 155. |
When a dielectric loses its dielectric property, the phenomenon is called |
| A. | dielectric loss |
| B. | dielectric breakdown |
| C. | polarisation |
| D. | magnetization |
| Answer» B. dielectric breakdown | |
| 156. |
Choose the best definition of dielectric loss. |
| A. | absorption of electric energy by dielectric in an ac field |
| B. | dissipation of electric energy by dielectric in a static field |
| C. | dissipation of heat by dielectric |
| D. | product of loss tangent and relative permittivity |
| Answer» A. absorption of electric energy by dielectric in an ac field | |
| 157. |
The charge within a conductor will be |
| A. | 1 |
| B. | -1 |
| C. | 0 |
| D. | ∞ |
| Answer» C. 0 | |
| 158. |
For a conservative field which of the following equations holds good? |
| A. | ∫ e.dl = 0 |
| B. | ∫ h.dl = 0 |
| C. | ∫ b.dl = 0 |
| D. | ∫ d.dl = 0 |
| Answer» A. ∫ e.dl = 0 | |
| 159. |
Find the electric field if the surface density at the boundary of air is 10-9. |
| A. | 12π |
| B. | 24π |
| C. | 36π |
| D. | 48π |
| Answer» C. 36π | |
| 160. |
Find the flux density at the boundary when the charge density is given by 24 units. |
| A. | 12 |
| B. | 24 |
| C. | 48 |
| D. | 96 |
| Answer» B. 24 | |
| 161. |
The normal component of which quantity is always discontinuous at the boundary? |
| A. | e |
| B. | d |
| C. | h |
| D. | b |
| Answer» B. d | |
| 162. |
Find the permittivity of the surface when a wave incident at an angle 60 is reflected by the surface at 45 in air. |
| A. | 1.41 |
| B. | 3.5 |
| C. | 2.2 |
| D. | 1.73 |
| Answer» D. 1.73 | |
| 163. |
In free space, the Poisson equation becomes |
| A. | maxwell equation |
| B. | ampere equation |
| C. | laplace equation |
| D. | steady state equation |
| Answer» C. laplace equation | |
| 164. |
If Laplace equation satisfies, then which of the following statements will be true? |
| A. | potential will be zero |
| B. | current will be infinite |
| C. | resistance will be infinite |
| D. | voltage will be same |
| Answer» B. current will be infinite | |
| 165. |
Suppose the potential function is a step function. The equation that gets satisfied is |
| A. | laplace equation |
| B. | poisson equation |
| C. | maxwell equation |
| D. | ampere equation |
| Answer» A. laplace equation | |
| 166. |
The function V = exsin y + z does not satisfy Laplace equation. State True/False. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 167. |
Poisson equation can be derived from which of the following equations? |
| A. | point form of gauss law |
| B. | integral form of gauss law |
| C. | point form of ampere law |
| D. | integral form of ampere law |
| Answer» A. point form of gauss law | |
| 168. |
Find the charge density from the function of flux density given by 12x – 7z. |
| A. | 19 |
| B. | -5 |
| C. | 5 |
| D. | -19 |
| Answer» C. 5 | |
| 169. |
Find the electric field of a potential function given by 20 log x + y at the point (1,1,0). |
| A. | -20 i – j |
| B. | -i -20 j |
| C. | i + j |
| D. | (i + j)/20 |
| Answer» A. -20 i – j | |
| 170. |
When a material has zero permittivity, the maximum potential that it can possess is |
| A. | ∞ |
| B. | -∞ |
| C. | unity |
| D. | zero |
| Answer» D. zero | |
| 171. |
Work done in charging a capacitor is |
| A. | qv |
| B. | 1⁄2qv |
| C. | 2qv |
| D. | qv2 |
| Answer» B. 1⁄2qv | |
| 172. |
Energy stored in 2000mF capacitor charged to a potential difference of 10V is? |
| A. | 100j |
| B. | 200j |
| C. | 300j |
| D. | 400j |
| Answer» A. 100j | |
| 173. |
When do we get maximum energy from a set of capacitors? |
| A. | when they are connected in parallel |
| B. | when they are connected in series |
| C. | both in series and parallel |
| D. | insufficient information provided |
| Answer» A. when they are connected in parallel | |
| 174. |
Calculate the energy in the 2F capacitor. |
| A. | 8.6kj |
| B. | 64kj |
| C. | 64j |
| D. | 6.4kj |
| Answer» D. 6.4kj | |
| 175. |
Calculate the energy in the 4F capacitor. |
| A. | 128kj |
| B. | 1.28kj |
| C. | 12.8kj |
| D. | 1280j |
| Answer» C. 12.8kj | |
| 176. |
Calculate the energy stored in the combination of the capacitors. |
| A. | 192kj |
| B. | 1.92kj |
| C. | 19.2kj |
| D. | 1920j |
| Answer» C. 19.2kj | |
| 177. |
The unit for dielectric strength is |
| A. | v/m2 |
| B. | mv/m2 |
| C. | mv/m |
| D. | vm |
| Answer» C. mv/m | |
| 178. |
If the Voltage increases, what happens to dielectric strength? |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | becomes zero |
| Answer» A. increases | |
| 179. |
If the thickness of the material increases, what happens to the dielectric strength? |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | becomes zero |
| Answer» B. decreases | |
| 180. |
Which medium has the highest dielectric strength? |
| A. | water |
| B. | mica |
| C. | air |
| D. | glass |
| Answer» C. air | |
| 181. |
Leakage in capacitors is primarily caused by |
| A. | transistors |
| B. | resistors |
| C. | inductors |
| D. | dc motors |
| Answer» A. transistors | |
| 182. |
What is the conduction current when a capacitor is fully charged? |
| A. | infinity |
| B. | zero |
| C. | 100a |
| D. | 1000a |
| Answer» B. zero | |
| 183. |
The flow of electrons in dielectric is due to |
| A. | conduction |
| B. | potential difference |
| C. | breakdown |
| D. | resistance |
| Answer» C. breakdown | |
| 184. |
The flow of electrons which does not pass through the battery is known as |
| A. | displacement current |
| B. | leakage current |
| C. | either displacement or leakage current |
| D. | neither displacement nor leakage current |
| Answer» A. displacement current | |
| 185. |
The free electrons in practical dielectrics is due to _ |
| A. | there are no free electrons |
| B. | conductors |
| C. | impurities |
| D. | both conductors and impurities |
| Answer» C. impurities | |
| 186. |
What is the type of current where the electrons actually move? |
| A. | displacement current |
| B. | conduction current |
| C. | both conduction and displacement current |
| D. | neither conduction nor displacement current |
| Answer» B. conduction current | |
| 187. |
What is the type of current caused due to variations in the field? |
| A. | displacement current |
| B. | conduction current |
| C. | both conduction and displacement current |
| D. | neither conduction nor displacement current |
| Answer» A. displacement current | |
| 188. |
Under normal conditions capacitors have _ |
| A. | displacement current |
| B. | conduction current |
| C. | both conduction and displacement current |
| D. | neither conduction nor displacement current |
| Answer» A. displacement current | |
| 189. |
Under normal conditions capacitors have _ |
| A. | displacement current |
| B. | conduction current |
| C. | both conduction and displacement current |
| D. | neither conduction nor displacement current |
| Answer» A. displacement current | |
| 190. |
What is the unit for displacement current? |
| A. | no unit |
| B. | ampere |
| C. | coulomb |
| D. | ampere/coulomb |
| Answer» B. ampere | |
| 191. |
Displacement current depends on _ |
| A. | moving charges |
| B. | change in time |
| C. | both moving charges and change in time |
| D. | neither moving charges nor change in time |
| Answer» B. change in time | |
| 192. |
Magnetic fields between the parallel plates of a capacitor are due to? |
| A. | displacement current |
| B. | conduction current |
| C. | both conduction and displacement current |
| D. | neither conduction nor displacement current |
| Answer» A. displacement current | |
| 193. |
The free electrons in practical dielectrics are due to |
| A. | there are no free electrons |
| B. | conductors |
| C. | impurities |
| D. | displacement currents |
| Answer» C. impurities | |
| 194. |
Paper capacitor is a type of _ |
| A. | fixed capacitor |
| B. | variable capacitor |
| C. | either fixed or variable depending on its usage |
| D. | neither fixed nor variable |
| Answer» A. fixed capacitor | |
| 195. |
A capacitor using chemical reactions to store charge is _ |
| A. | paper capacitor |
| B. | ceramic capacitor |
| C. | polyester capacitor |
| D. | electrolyte capacitor |
| Answer» D. electrolyte capacitor | |
| 196. |
Which, among the following, is the odd one out? |
| A. | ceramic capacitor |
| B. | electrolyte capacitor |
| C. | tuning capacitor |
| D. | paper capacitor |
| Answer» C. tuning capacitor | |
| 197. |
In a variable capacitor, capacitance can be varied by |
| A. | turning the rotatable plates in or out |
| B. | sliding the rotatable plates |
| C. | changing the plates |
| D. | changing the material of plates |
| Answer» A. turning the rotatable plates in or out | |
| 198. |
The simplest kind of capacitor is _ |
| A. | ceramic capacitor |
| B. | electrolyte capacitor |
| C. | tuning capacitor |
| D. | paper capacitor |
| Answer» D. paper capacitor | |
| 199. |
Capacitor preferred when there is high frequency in the circuits is _ |
| A. | electrolyte capacitor |
| B. | mica capacitor |
| C. | air capacitor |
| D. | glass capacitor |
| Answer» B. mica capacitor | |
| 200. |
The type of capacitors used in communication transmitters are? |
| A. | electrolyte capacitor |
| B. | variable capacitor |
| C. | air capacitor |
| D. | glass capacitor |
| Answer» B. variable capacitor | |
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