McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 201. |
Which capacitors relatively costly? |
| A. | electrolyte capacitor |
| B. | mica capacitor |
| C. | air capacitor |
| D. | glass capacitor |
| Answer» B. mica capacitor | |
| 202. |
capacitors have a high leakage voltage. |
| A. | electrolyte capacitor |
| B. | variable capacitor |
| C. | "c) air capacitor |
| D. | polyester capacitor |
| Answer» D. polyester capacitor | |
| 203. |
The force between two charges is 120 N. If the distance between the charges is doubled, the force will be |
| A. | 60 n |
| B. | 30 n |
| C. | 40 n |
| D. | 15 n |
| Answer» B. 30 n | |
| 204. |
The electric field intensity at a point situated 4 metres from a point charge is 200 N/C. If the distance is reduced to 2 metres, the field intensity will be |
| A. | 400 n/c |
| B. | 600 n/c |
| C. | 800 n/c |
| D. | 1200 n/c |
| Answer» C. 800 n/c | |
| 205. |
The lines of force due to charged particles are |
| A. | always straight |
| B. | always curved |
| C. | sometimes curved |
| D. | none of the above |
| Answer» B. always curved | |
| 206. |
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» B. inversely proportional to d | |
| 207. |
The direction of electric field due +0 positive charge is . |
| A. | away from the charge |
| B. | towards the charge |
| C. | both (a) and (6) |
| D. | none of the above |
| Answer» A. away from the charge | |
| 208. |
A field line and an equipotential surface are |
| A. | always parallel |
| B. | always at 90° |
| C. | inclined at any angle 0 |
| D. | none of the above |
| Answer» B. always at 90° | |
| 209. |
The ability of charged bodies to exert force on 6ne another is attributed to the existence of |
| A. | electrons |
| B. | protons |
| C. | neutrons |
| D. | electric field |
| Answer» D. electric field | |
| 210. |
If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will |
| A. | decrease |
| B. | increase |
| C. | remains unchanged |
| D. | become zero |
| Answer» B. increase | |
| 211. |
A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is |
| A. | 0.024 f |
| B. | 0.12 f |
| C. | 0.6 f |
| D. | 0.8 f |
| Answer» A. 0.024 f | |
| 212. |
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» B. high permittivity | |
| 213. |
The units of capacitance are |
| A. | volts/coulomb |
| B. | coulombs/volt |
| C. | ohms |
| D. | henry/wb |
| Answer» B. coulombs/volt | |
| 214. |
If three 10 uF capacitors are connected in parallel, the net cararitance is |
| A. | 20 uf |
| B. | 30 ue |
| C. | 40 uf |
| D. | 50 uf |
| Answer» B. 30 ue | |
| 215. |
A dielectric material must be |
| A. | resistor |
| B. | insulator |
| C. | good conductor |
| D. | semi conductor |
| Answer» B. insulator | |
| 216. |
Which of the following is not a vector ? |
| A. | linear momentum |
| B. | angular momentum |
| C. | electric field |
| D. | electric potential |
| Answer» B. angular momentum | |
| 217. |
Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the |
| A. | voltage across the plates increases |
| B. | voltage across the plates decreases |
| C. | charge on the capacitor decreases |
| D. | charge on the capacitor increases |
| Answer» B. voltage across the plates decreases | |
| 218. |
If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because |
| A. | varying voltage produces the charg¬ing and dicharging currents |
| B. | of high peak value |
| C. | charging current can flow |
| D. | discharge current can flow |
| Answer» A. varying voltage produces the charg¬ing and dicharging currents | |
| 219. |
The dissipation factor of a good dielectric is of the order of |
| A. | 0.0002 |
| B. | 0.002 |
| C. | 0.02 |
| D. | 0.2 |
| Answer» A. 0.0002 | |
| 220. |
Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them |
| A. | all in series |
| B. | all in parallel |
| C. | two in parallel and third in series with this combination |
| D. | two in series and third in parallel across this combination |
| Answer» C. two in parallel and third in series with this combination | |
| 221. |
For which of the following parameter variation, the capacitance of the capacitor remains unaffected ? |
| A. | distance between plates |
| B. | area of the plates |
| C. | nature of dielectric |
| D. | thickness of the plates |
| Answer» D. thickness of the plates | |
| 222. |
Which of the following statement is true ? |
| A. | the current in the discharging capacitor grows linearly |
| B. | the current in the dicharging capacitor grows exponentially |
| C. | the current in the discharging capacitor decays exponentially |
| D. | the current in the discharging capacitor decreases constantly |
| Answer» B. the current in the dicharging capacitor grows exponentially | |
| 223. |
Which of the following expression is correct for electric field strength ? |
| A. | E = D/E |
| B. | E = D2/t |
| C. | E = jtD |
| D. | E = nD2 |
| Answer» A. E = D/E | |
| 224. |
In a capacitor the electric charge is stored in |
| A. | metal plates |
| B. | dielectric |
| C. | both (a) and (6) |
| D. | none of the above |
| Answer» B. dielectric | |
| 225. |
Which of the following materials has the highest value of dielectric constant? |
| A. | glass |
| B. | vacuum |
| C. | ceramics |
| D. | oil |
| Answer» C. ceramics | |
| 226. |
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» C. silver plated mica capacitor | |
| 227. |
Which of the following statements is incorrect ? |
| A. | the leakage resistance of ceramic capacitors is generally high |
| B. | the stored energy in a capacitor decreases with reduction in value of capacitance |
| C. | the stored energy in a capacitor increases with applied voltage |
| D. | a wire cable has distributed capacitance between the conductors |
| Answer» B. the stored energy in a capacitor decreases with reduction in value of capacitance | |
| 228. |
Which of the following capacitors has relatively shorter shelf life ? |
| A. | mica capacitor |
| B. | electrolytic capacitor |
| C. | ceramic capacitor |
| D. | paper capacitor |
| Answer» B. electrolytic capacitor | |
| 229. |
In the case of a lossy capacitor, its series equivalent resistance value will be |
| A. | small |
| B. | very small |
| C. | large |
| D. | zero |
| Answer» C. large | |
| 230. |
In a capacitive circuit |
| A. | a steady value of applied voltage causes discharge |
| B. | an increase in applied voltage makes a capacitor charge |
| C. | decrease in applied voltage makes a capacitor charge |
| D. | none of the above |
| Answer» B. an increase in applied voltage makes a capacitor charge | |
| 231. |
When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will |
| A. | remain uncharged |
| B. | decrease |
| C. | increase |
| D. | become zero |
| Answer» B. decrease | |
| 232. |
Capacitance increases with |
| A. | increase in plate area and decrease in distance between the plates |
| B. | increase in plate area and distance between the plates |
| C. | decrease in plate area and value of applied voltage |
| D. | reduction in plate area and distance between the plates |
| Answer» A. increase in plate area and decrease in distance between the plates | |
| 233. |
A capacitor consists of |
| A. | two insulators separated by a con¬ductor |
| B. | two conductors separated by an in¬sulator |
| C. | two insulators only |
| D. | two conductors only |
| Answer» B. two conductors separated by an in¬sulator | |
| 234. |
A paper capacitor is usually available in the form of |
| A. | tubes |
| B. | rolled foil |
| C. | disc |
| D. | meshed plates |
| Answer» B. rolled foil | |
| 235. |
Air capacitors are generally available in the range |
| A. | 10 to 400 pf |
| B. | 1 to 20 pf |
| C. | 100 to 900 pf |
| D. | 20 to 100 pf |
| Answer» A. 10 to 400 pf | |
| 236. |
The unit of capacitance is |
| A. | henry |
| B. | ohm |
| C. | farad |
| D. | farad/m |
| Answer» C. farad | |
| 237. |
A capacitor in a circuit became hot and ultimately exploded due to wrong con¬nections, which type of capacitor it could be ? |
| A. | paper capacitor |
| B. | ceramic capacitor |
| C. | electrolytic capacitor |
| D. | any-of the above |
| Answer» C. electrolytic capacitor | |
| 238. |
Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules |
| A. | cv2 |
| B. | c2v |
| C. | cv2 |
| D. | cv |
| Answer» A. cv2 | |
| 239. |
Electric field intensity is a quantity |
| A. | scalar |
| B. | vector |
| C. | both (a) and (6) |
| D. | none of the above |
| Answer» B. vector | |
| 240. |
When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of |
| A. | 2 joules |
| B. | 4 joules |
| C. | 6 joules |
| D. | 8 joules |
| Answer» D. 8 joules | |
| 241. |
The capacitor preferred for high frequency circuits is |
| A. | air capacitor |
| B. | mica capacitor |
| C. | electrolytic capacitor |
| D. | none of the above |
| Answer» B. mica capacitor | |
| 242. |
The capacity of capacitor bank used in power factor correction is expressed in terms of |
| A. | kw |
| B. | kva |
| C. | kvar |
| D. | volts |
| Answer» C. kvar | |
| 243. |
While testing a capacitor with ohm-metre, 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» D. leaky | |
| 244. |
If a 6 (iF 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» C. 1200 uc | |
| 245. |
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» A. ceramic capacitor | |
| 246. |
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» B. 100 pf | |
| 247. |
A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance ? |
| A. | ceramic capacitor |
| B. | mica capacitor |
| C. | both will have identical value of capacitance |
| D. | it depends on applied voltage |
| Answer» A. ceramic capacitor | |
| 248. |
Which of the following material has least value of dielectric constant ? |
| A. | ceramics |
| B. | oil |
| C. | glass |
| D. | paper |
| Answer» B. oil | |
| 249. |
Which of the following capacitors will have the least value of breakdown voltage ? |
| A. | mica |
| B. | paper |
| C. | ceramic |
| D. | electrolytic |
| Answer» D. electrolytic | |
| 250. |
Dielectric constant for mica is nearly |
| A. | 200 |
| B. | 100 |
| C. | 3 to 8 |
| D. | 1 to 2 |
| Answer» C. 3 to 8 | |
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