MCQOPTIONS
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MCQOPTIONS
This section includes 682 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Calculate the transmission coefficient, when the incident and transmitted amplitudes are 10 and 7 respectively. |
| A. | 17 |
| B. | 3 |
| C. | 10/7 |
| D. | 0.7 |
| Answer» E. | |
| 202. |
The reflection coefficient of a wave travelling through two media having permittivities 4 and 9 respectively is |
| A. | 0 |
| B. | 0.5 |
| C. | 0.25 |
| D. | 0.2 |
| Answer» E. | |
| 203. |
Find the reflection coefficient of the wave passing through two media having intrinsic impedances of 4 and 9 respectively. |
| A. | 0.5 |
| B. | 1 |
| C. | 0.38 |
| D. | 0.1 |
| Answer» D. 0.1 | |
| 204. |
The incident wave amplitude is 24 units. Find the reflected wave amplitude if the reflection coefficient is 0.6. |
| A. | 14.4 |
| B. | 16.6 |
| C. | 13.3 |
| D. | 11.1 |
| Answer» B. 16.6 | |
| 205. |
When the ratio of load voltage to input voltage is 5, the ratio of the characteristic impedance to the input impedance is |
| A. | 1/5 |
| B. | 5 |
| C. | 10 |
| D. | 25 |
| Answer» C. 10 | |
| 206. |
The reflection coefficient lies in the range of |
| A. | 0 < Ï„ < 1 |
| B. | -1 < Ï„ < 1 |
| C. | 1 < τ < ∞ |
| D. | 0 < τ < ∞ |
| Answer» B. -1 < Ï„ < 1 | |
| 207. |
The input impedance of a quarter wave line 50 ohm and load impedance of 20 ohm is |
| A. | 50 |
| B. | 20 |
| C. | 1000 |
| D. | 125 |
| Answer» E. | |
| 208. |
The reflection coefficient of a wave with transmission coefficient 0.35 is |
| A. | 1.35 |
| B. | 0.65 |
| C. | 0.35 |
| D. | 0.7 |
| Answer» C. 0.35 | |
| 209. |
The characteristic impedance of a quarter wave transformer with load and input impedances given by 30 and 75 respectively is |
| A. | 47.43 |
| B. | 37.34 |
| C. | 73.23 |
| D. | 67.45 |
| Answer» B. 37.34 | |
| 210. |
The quarter wave transformer can be considered as a |
| A. | impedance inverter |
| B. | impedance doubler |
| C. | impedance tripler |
| D. | impedance quadrupler |
| Answer» B. impedance doubler | |
| 211. |
The purpose of the transmission line equation is to |
| A. | find primary parameters |
| B. | find secondary parameters |
| C. | find the reflection cofficient |
| D. | impedance matching |
| Answer» E. | |
| 212. |
The reflection coefficient of a perfectly matched transmission line is |
| A. | 1 |
| B. | -1 |
| C. | ∞ |
| Answer» D. | |
| 213. |
Which transmission line is called as one to one transformer? |
| A. | l = λ |
| B. | l = λ/2 |
| C. | l = λ/4 |
| D. | l = λ/8 |
| Answer» C. l = λ/4 | |
| 214. |
Find the characteristic impedance of a quarter wave with input and load impedances given by 50 and 25 respectively. |
| A. | 50 |
| B. | 25 |
| C. | 75 |
| D. | 35.35 |
| Answer» E. | |
| 215. |
The condition for a quarter wave transformer is |
| A. | zo2 = zin zl |
| B. | zo = zin zl |
| C. | zl2 = zin zo |
| D. | zo = zin |
| Answer» B. zo = zin zl | |
| 216. |
Find the load impedance in a quarter line transformer with characteristic impedance of 75 ohm and input impedance of 200 ohm. |
| A. | 28.125 |
| B. | 12.285 |
| C. | 52.185 |
| D. | 85.128 |
| Answer» B. 12.285 | |
| 217. |
The input impedance of a half wave transmission line with a load impedance of 12.5 ohm is |
| A. | 25 |
| B. | 50 |
| C. | 6.25 |
| D. | 12.5 |
| Answer» E. | |
| 218. |
When the length of the transmission line is same as that of the wavelength, then which condition holds good? |
| A. | zin = zo |
| B. | z = zo |
| C. | zl = zo |
| D. | zin = zl |
| Answer» E. | |
| 219. |
The best transmission length for effective transmission of power is |
| A. | l = λ/4 |
| B. | l = λ/8 |
| C. | l = λ/2 |
| D. | l = ∞ |
| Answer» C. l = λ/2 | |
| 220. |
For an infinite transmission line, the characteristic impedance is given by 50 ohm. Find the input impedance. |
| A. | 25 |
| B. | 100 |
| C. | 2500 |
| D. | 50 |
| Answer» E. | |
| 221. |
Which of the following parameters does not exist in the transmission line equation? |
| A. | r |
| B. | zo |
| C. | zl |
| D. | propagation constant |
| Answer» B. zo | |
| 222. |
The velocity of wave in the air medium is |
| A. | 1 x 108 |
| B. | 1.5 x 108 |
| C. | 3 x 108 |
| D. | 1 x 109 |
| Answer» D. 1 x 109 | |
| 223. |
The propagation constant of a wave with attenuation and phase constant given by 2 and 3 respectively is |
| A. | 2 – 3j |
| B. | 3 – 2j |
| C. | 2 + 3j |
| D. | 3 + 2j |
| Answer» D. 3 + 2j | |
| 224. |
The unit of attenuation constant is |
| A. | decibel |
| B. | bel |
| C. | neper |
| D. | no unit |
| Answer» D. no unit | |
| 225. |
Identify the secondary parameter from the options given below. |
| A. | resistance |
| B. | conductance |
| C. | phase constant |
| D. | capacitance |
| Answer» D. capacitance | |
| 226. |
The wavelength of a line with a phase constant of 6.28 units is |
| A. | 2 |
| B. | 1 |
| C. | 0.5 |
| D. | 3.14 |
| Answer» C. 0.5 | |
| 227. |
The electrical length in a transmission line refers to the |
| A. | product of attenuation constant and length |
| B. | ratio of attenuation constant and length |
| C. | product of phase constant and length |
| D. | ratio of phase constant and length |
| Answer» B. ratio of attenuation constant and length | |
| 228. |
The phase constant of a wave with a wavelength of 2 units is given by |
| A. | 2 |
| B. | 3.14 |
| C. | 6.28 |
| D. | 1 |
| Answer» C. 6.28 | |
| 229. |
The velocity and phase constant relation is given by |
| A. | v = ω/β |
| B. | v = ωβ |
| C. | v = β/ω |
| D. | vωβ = 1 |
| Answer» B. v = ωβ | |
| 230. |
The frequency of a wave travelling in a transmission line with velocity 4 x 108 and wavelength 3 units is |
| A. | 0.75 ghz |
| B. | 0.133 ghz |
| C. | 7.5 ghz |
| D. | 1.33 ghz |
| Answer» C. 7.5 ghz | |
| 231. |
When a transmission line has a load impedance same as that of the characteristic impedance, the line is said to be |
| A. | parallel |
| B. | perpendicular |
| C. | polarized |
| D. | matched |
| Answer» E. | |
| 232. |
The wavelength of a wave with a frequency of 6 GHz in air is |
| A. | 50 |
| B. | 5 |
| C. | 0.5 |
| D. | 0.05 |
| Answer» E. | |
| 233. |
Find the characteristic impedance expression in terms of the inductance and capacitance parameters. |
| A. | zo = √(lc) |
| B. | zo = lc |
| C. | zo = √(l/c) |
| D. | zo = l/c |
| Answer» D. zo = l/c | |
| 234. |
The characteristic impedance of a transmission line with impedance and admittance of 16 and 9 respectively is |
| A. | 25 |
| B. | 1.33 |
| C. | 7 |
| D. | 0.75 |
| Answer» C. 7 | |
| 235. |
Find the receiving impedance of a transmission line having a voltage of 24V and a conduction current of 1.2A is |
| A. | 25.2 |
| B. | 22.8 |
| C. | 28.8 |
| D. | 20 |
| Answer» E. | |
| 236. |
The primary parameter that is associated with the electric charges is |
| A. | g |
| B. | r |
| C. | c |
| D. | l |
| Answer» D. l | |
| 237. |
The primary parameter that is associated with the magnetic flux linkage is |
| A. | r |
| B. | l |
| C. | c |
| D. | g |
| Answer» C. c | |
| 238. |
Which primary parameter is uniformly distributed along the length of the conductor? |
| A. | g |
| B. | c |
| C. | l |
| D. | r |
| Answer» E. | |
| 239. |
The networks in which the R, L, C parameters are individually concentrated or lumped at discrete points in the circuit are called |
| A. | lumped |
| B. | distributed |
| C. | parallel |
| D. | paired |
| Answer» B. distributed | |
| 240. |
The lines having R, L, C distributed along the circuit are called |
| A. | lumped |
| B. | distributed |
| C. | parallel |
| D. | paired |
| Answer» C. parallel | |
| 241. |
Which of the following parameters is not a primary parameter? |
| A. | resistance |
| B. | attenuation constant |
| C. | capacitance |
| D. | conductance |
| Answer» C. capacitance | |
| 242. |
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by |
| A. | variation in coil current |
| B. | variation in voltage to the coil |
| C. | change of number of turns of coil |
| D. | the resistance of magnetic path |
| Answer» C. change of number of turns of coil | |
| 243. |
A crack in the magnetic path of an inductor will result in |
| A. | unchanged inductance |
| B. | increased inductance |
| C. | zero inductance |
| D. | reduced inductance |
| Answer» E. | |
| 244. |
Which circuit element(s) will oppose the change in circuit current ? |
| A. | resistance only |
| B. | inductance only |
| C. | capacitance only |
| D. | inductance and capacitance |
| Answer» C. capacitance only | |
| 245. |
Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is |
| A. | 5 mh |
| B. | 10 mh |
| C. | 5 h |
| D. | 10 h |
| Answer» D. 10 h | |
| 246. |
Two 300 uH coils in series without mutual coupling have a total inductance of |
| A. | 300 uh |
| B. | 600 uh |
| C. | 150 uh |
| D. | 75 uh |
| Answer» C. 150 uh | |
| 247. |
A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is |
| A. | 3500 mh |
| B. | 350 mh |
| C. | 250 mh |
| D. | 150 mh |
| Answer» C. 250 mh | |
| 248. |
Which of the fpllowing inductor will have the least eddy current losses ? |
| A. | air core |
| B. | laminated iron core |
| C. | iron core |
| D. | powdered iron core |
| Answer» B. laminated iron core | |
| 249. |
An average voltage of 10 V is induced in a 250 turns solenoid as a result of a change in flux which occurs in 0.5 second. The total flux change is |
| A. | 20 wb |
| B. | 2 wb |
| C. | 0.2 wb |
| D. | 0.02 wb |
| Answer» E. | |
| 250. |
The co-efficient of coupling between two air core coils depends on |
| A. | self-inductance of two coils only |
| B. | mutual inductance between two coils only |
| C. | mutual inductance and self inductance of two coils |
| D. | none of the above |
| Answer» D. none of the above | |