MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 185 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. |
Dielectric constant for mica is nearly |
| A. | 200 |
| B. | 100 |
| C. | 3 to 8 |
| D. | 1 to 2 |
| Answer» D. 1 to 2 | |
| 152. |
capacitors are used in transistor circuits. |
| A. | Ceramic |
| B. | Paper |
| C. | Air |
| D. | Electrolytic |
| Answer» B. Paper | |
| 153. |
The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by |
| A. | CIR |
| B. | 1/RC |
| C. | RC |
| D. | RIC |
| Answer» D. RIC | |
| 154. |
capacitors are used for audio frequency and radio frequency coupling and tuning. |
| A. | Air |
| B. | Mica |
| C. | Plastic film |
| D. | Ceramic |
| Answer» C. Plastic film | |
| 155. |
A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be |
| A. | 5 times smaller than before |
| B. | 5 times greater than before |
| C. | 10 times greater than before |
| D. | 25 times larger than before |
| Answer» E. | |
| 156. |
A capacitor consists of |
| A. | two insulators separated by a conductor |
| B. | two conductors separated by an insulator |
| C. | two insulators only |
| D. | two conductors only |
| Answer» C. two insulators only | |
| 157. |
What is the value of capacitance that must be connected in parallel with 50 pF condenser to make an equivalent capacitance of 150 pF ? |
| A. | 50 pF |
| B. | 100 pF |
| C. | 150 pF |
| D. | 200 pF |
| Answer» C. 150 pF | |
| 158. |
_______ field is associated with the capacitor. |
| A. | Electric |
| B. | Magnetic |
| C. | Both (A) and (B) |
| D. | None of the above |
| Answer» B. Magnetic | |
| 159. |
The relative permittivity has the following units |
| A. | F/m |
| B. | m/F |
| C. | Wb/m |
| D. | no units |
| Answer» E. | |
| 160. |
A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is |
| A. | 50 joules |
| B. | 150 joules |
| C. | 200 joules |
| D. | 250 joules |
| Answer» E. | |
| 161. |
Which medium has the least dielectric strength ? |
| A. | Paraffin wax |
| B. | Quartz |
| C. | Glass |
| D. | Air |
| Answer» E. | |
| 162. |
For making a capacitor, it is better to select a dielectric having |
| A. | low permittivity |
| B. | high permittivity |
| C. | permittivity same as that of air |
| D. | permittivity slightly more than that of air |
| Answer» C. permittivity same as that of air | |
| 163. |
The unit of capacitance is |
| A. | henry |
| B. | ohm |
| C. | farad |
| D. | farad/m |
| Answer» D. farad/m | |
| 164. |
The capacitance between two plates increases with |
| A. | shorter plate area and higher applied voltage |
| B. | shorter plate area and shorter distance between them |
| C. | larger plate area, longer distance between plates and higher,applied voltage |
| D. | larger plate area and shorter distance between plates |
| Answer» E. | |
| 165. |
A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is |
| A. | 62 x 105 V/m |
| B. | 72 x 105 V/m |
| C. | 82 x 105 V/m |
| D. | 92 x 105 V/m |
| Answer» C. 82 x 105 V/m | |
| 166. |
The units of capacitance are |
| A. | volts/coulomb |
| B. | coulombs/volt |
| C. | ohms |
| D. | henry/Wb |
| Answer» C. ohms | |
| 167. |
When the dielectric is homogeneous,the potential gradient is |
| A. | uniform |
| B. | non-uniform |
| C. | zero |
| D. | any of the above |
| Answer» B. non-uniform | |
| 168. |
Which capacitor will be physically smaller for the same ratings ? |
| A. | Ceramic capacitor |
| B. | Paper capacitor |
| C. | Both will be of equal size |
| D. | None of the above |
| Answer» B. Paper capacitor | |
| 169. |
A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The time constant of the circuit is$ |
| A. | 0.2 s |
| B. | 0.4 s |
| C. | 0.6 s |
| D. | 0.8 s |
| Answer» E. | |
| 170. |
In a cable capacitor, voltage gradient is maximum at the surface of the |
| A. | earth |
| B. | conduction |
| C. | sheath |
| D. | insulator |
| Answer» C. sheath | |
| 171. |
While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is |
| A. | Short-circuited |
| B. | Open circuited |
| C. | Alright |
| D. | Leaky |
| Answer» E. | |
| 172. |
The bridge used for the measurement of the value of the capacitance is |
| A. | Wien’s bridge |
| B. | Wheatstone bridge |
| C. | Schering bridge |
| D. | Hay’s bridge |
| Answer» D. Hay‚Äö√Ñ√¥s bridge | |
| 173. |
The absolute permittivity of free space is given by |
| A. | 8.854 x 1(T9 F/m) |
| B. | 8.854 x 1(T10 F/m) |
| C. | 8.854 x KT11 F/m |
| D. | 8.854 x 10?12 F/m |
| Answer» C. 8.854 x KT11 F/m | |
| 174. |
If three 15 uF capacitors are connected in series, the net capacitance is |
| A. | 5 uF |
| B. | 30 uF |
| C. | 45 uF |
| D. | 50 uF |
| Answer» B. 30 uF | |
| 175. |
Which of the following materials has the highest value of dielectric constant? |
| A. | Glass |
| B. | Vacuum |
| C. | Ceramics |
| D. | Oil |
| Answer» D. Oil | |
| 176. |
The unit of dielectric strength is given by |
| A. | V/m |
| B. | V2/m |
| C. | m/V |
| D. | m/V2 |
| Answer» B. V2/m | |
| 177. |
Which of the following capacitors will have the least variation? |
| A. | Paper capacitor |
| B. | Ceramic capacitor |
| C. | Silver plated mica capacitor |
| D. | None of the above |
| Answer» D. None of the above | |
| 178. |
In a capacitor the electric charge is stored in |
| A. | metal plates |
| B. | dielectric |
| C. | both (A) and (B) |
| D. | none of the above |
| Answer» C. both (A) and (B) | |
| 179. |
The electric field at a point situated at a distance d from straight charged conductor is |
| A. | proportional to d |
| B. | inversely proportional to d |
| C. | inversely proportional to d |
| D. | none of the above |
| Answer» C. inversely proportional to d | |
| 180. |
To prevent the generation of static charges on rubber or flat leather |
| A. | surface is moistened |
| B. | conductive dressing is done |
| C. | oil compound dressing is done |
| D. | talcum powder is sprayed on the surface |
| Answer» C. oil compound dressing is done | |
| 181. |
The inverse of capacitance is called |
| A. | reluctance |
| B. | conductance |
| C. | susceptance |
| D. | elastance |
| Answer» E. | |
| 182. |
Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is |
| A. | 0.56 x 1015 m/s2 |
| B. | 1.5 x 1015 m/s2 |
| C. | 1.6 x 1015 m/s2 |
| D. | 1.76 x 1015 m/s2 |
| Answer» E. | |
| 183. |
One volt is the same as |
| A. | one joule/coulomb |
| B. | one coulomb/joule |
| C. | one coulomb |
| D. | one joule |
| Answer» B. one coulomb/joule | |
| 184. |
If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because |
| A. | varying voltage produces the charging and dicharging currents |
| B. | of high peak value |
| C. | charging current can flow |
| D. | discharge current can flow |
| Answer» B. of high peak value | |
| 185. |
If a 6 uF capacitor is charged to 200 V, the charge in coulombs will be |
| A. | 800 uC |
| B. | 900 uC |
| C. | 1200 uC |
| D. | 1600 uC |
| Answer» D. 1600 uC | |