MCQOPTIONS
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MCQOPTIONS
This section includes 247 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. |
The modes of propagation supported by a rectangular wave guide is: |
| A. | tm, tem, te modes |
| B. | tm, te |
| C. | tm, tem |
| D. | te, tem |
| Answer» C. tm, tem | |
| 202. |
For TE1â‚’ mode, if the waveguide is filled with air and the broader dimension of the waveguide is 2 cm, then the cutoff frequency is: |
| A. | 5 mhz |
| B. | 7.5 mhz |
| C. | 7.5 ghz |
| D. | 5 ghz |
| Answer» D. 5 ghz | |
| 203. |
The major advantage of double stub tuning is: |
| A. | it uses 2 tuning stubs in fixed positions |
| B. | it involves 2 stubs |
| C. | length of the stub is variable |
| D. | none of the mentioned |
| Answer» B. it involves 2 stubs | |
| 204. |
In a double stub tuner circuit, the load is of _______ length from the first stub. |
| A. | fixed length |
| B. | arbitrary length |
| C. | depends on the load impedance to be matched |
| D. | depends on the characteristic impedance of the transmission line |
| Answer» C. depends on the load impedance to be matched | |
| 205. |
The major disadvantage of single stub tuning is: |
| A. | it requires a variable length of line between the load and the stub |
| B. | it involves 2 variable parameters |
| C. | complex calculation |
| D. | none of the mentioned |
| Answer» B. it involves 2 variable parameters | |
| 206. |
The reflection coefficient of a transmission line having characteristic and load impedances as 50 and 30 ohm respectively is |
| A. | 1/4 |
| B. | 1/8 |
| C. | 1/2 |
| D. | 3/4 |
| Answer» B. 1/8 | |
| 207. |
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. | |
| 208. |
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. | |
| 209. |
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 | |
| 210. |
Which primary parameter is uniformly distributed along the length of the conductor? |
| A. | g |
| B. | c |
| C. | l |
| D. | r |
| Answer» E. | |
| 211. |
The lowest mode of TE mode propagation in a circular waveguide is: |
| A. | te10 mode |
| B. | te00 mode |
| C. | te01 mode |
| D. | te11 mode |
| Answer» D. te11 mode | |
| 212. |
When a λ/4 transmission line is used for impedance matching, then which of the following is valid? |
| A. | standing waves are present on the λ/4 transmission line |
| B. | no standing waves on the λ/4 transmission line |
| C. | standing waves are not present both on the feed line and the matching λ/4 line |
| D. | standing waves are present on both the feed line and the matching λ/4 line |
| Answer» B. no standing waves on the λ/4 transmission line | |
| 213. |
If there is no standing wave on a transmission line, then the value of SWR is: |
| A. | 1 |
| B. | 0 |
| C. | infinity |
| D. | insufficient data |
| Answer» B. 0 | |
| 214. |
Expression for the characteristic impedance of a transmission line(λ/4) used for impedance matching is: |
| A. | z1=√(zₒr)l |
| B. | z1=√(zₒ/r)l |
| C. | z1=√(zₒ+r)l |
| D. | none of the mentioned |
| Answer» B. z1=√(zâ‚’/r)l | |
| 215. |
maintain at safe limit. |
| A. | average current |
| B. | average voltage |
| C. | average bias voltage |
| D. | average resistance |
| Answer» B. average voltage | |
| 216. |
an IMPATT diode, it results in: |
| A. | avalanche multiplication |
| B. | break down of depletion region |
| C. | high reverse saturation current |
| D. | none of the mentioned |
| Answer» B. break down of depletion region | |
| 217. |
The mode of operation in which the Gunn diode is not stable is: |
| A. | gunn oscillation mode |
| B. | limited space charge accumulation mode |
| C. | stable amplification mode |
| D. | bias circuit oscillation mode |
| Answer» B. limited space charge accumulation mode | |
| 218. |
GaAs is used in fabricating Gunn diode. Gunn diode is: |
| A. | bulk device |
| B. | sliced device |
| C. | made of different type of semiconductor layers |
| D. | none of the mentioned |
| Answer» B. sliced device | |
| 219. |
GaAs is used in the fabrication of GUNN diodes because: |
| A. | gaas is cost effective |
| B. | it less temperature sensitive |
| C. | it has low conduction band electrons |
| D. | less forbidden energy gap |
| Answer» E. | |
| 220. |
The material out of which PIN diode is made is: |
| A. | silicon |
| B. | germanium |
| C. | gaas |
| D. | none of the mentioned |
| Answer» B. germanium | |
| 221. |
A major disadvantage of klystron amplifier is: |
| A. | low power gain |
| B. | low bandwidth |
| C. | high source power |
| D. | design complexity |
| Answer» C. high source power | |
| 222. |
The phase and group velocities does not depend on which of the following? |
| A. | frequency |
| B. | wavelength |
| C. | phase constant |
| D. | attenuation constant |
| Answer» E. | |
| 223. |
Which of the following parameter is non zero for a lossless line? |
| A. | attenuation |
| B. | resistance |
| C. | conductance |
| D. | phase constant |
| Answer» E. | |
| 224. |
reflector electrode after the cavity. |
| A. | backward wave oscillator |
| B. | reflex klystron |
| C. | travelling wave tube |
| D. | magnetrons |
| Answer» C. travelling wave tube | |
| 225. |
amplifier. |
| A. | linear beam |
| B. | crossed field |
| C. | parallel field |
| D. | none of the mentioned |
| Answer» B. crossed field | |
| 226. |
The propagation constant for a lossless transmission line will be |
| A. | real |
| B. | complex |
| C. | real and equal to phase constant |
| D. | complex and equal to phase constant |
| Answer» E. | |
| 227. |
In transverse electric waves, which of the following is true? |
| A. | e is parallel to h |
| B. | e is parallel to wave direction |
| C. | e is transverse to wave direction |
| D. | h is transverse to wave direction |
| Answer» D. h is transverse to wave direction | |
| 228. |
The dominant mode in rectangular waveguide is |
| A. | te01 |
| B. | te10 |
| C. | tm01 |
| D. | tm10 |
| Answer» C. tm01 | |
| 229. |
The cut off frequency for a waveguide to operate is |
| A. | 3 mhz |
| B. | 3 ghz |
| C. | 6 mhz |
| D. | 6 ghz |
| Answer» E. | |
| 230. |
In rectangular waveguides, the dimensions a and b represent the |
| A. | broad wall dimensions |
| B. | broad wall and side wall dimension respectively |
| C. | side wall and broad wall dimension respectively |
| D. | side wall dimensions |
| Answer» C. side wall and broad wall dimension respectively | |
| 231. |
range of |
| A. | hz |
| B. | khz |
| C. | mhz |
| D. | ghz |
| Answer» E. | |
| 232. |
For the matched line, the parameters S12 and S21 are |
| A. | 1 |
| B. | 0 |
| C. | -1 |
| D. | ∞ |
| Answer» C. -1 | |
| 233. |
The waveguides are materials with characteristics of |
| A. | low bulk resistivity |
| B. | high bulk resistivity |
| C. | high conductivity |
| D. | low conductivity |
| Answer» B. high bulk resistivity | |
| 234. |
The scattering parameters are used to indicate the |
| A. | permittivity and permeability |
| B. | electric and magnetic field intensities |
| C. | reflection and transmission coefficients |
| D. | frequency and wavelength |
| Answer» D. frequency and wavelength | |
| 235. |
The circular waveguides use which function in the frequency calculation? |
| A. | laplace function |
| B. | schottky function |
| C. | bessel function |
| D. | transfer function |
| Answer» D. transfer function | |
| 236. |
The modes are calculated from which parameter? |
| A. | frequency |
| B. | wavelength |
| C. | phase constant |
| D. | v number |
| Answer» E. | |
| 237. |
The dominant mode in waveguide is the mode which has |
| A. | highest frequency |
| B. | highest wavelength |
| C. | lowest phase constant |
| D. | highest attenuation |
| Answer» C. lowest phase constant | |
| 238. |
The best stub selection for the transmission line will be |
| A. | series open |
| B. | series short |
| C. | shunt open |
| D. | shunt short |
| Answer» E. | |
| 239. |
respectively. The standing wave ratio is |
| A. | 2 |
| B. | 3 |
| C. | 1/2 |
| D. | 4 |
| Answer» C. 1/2 | |
| 240. |
The phenomenon employed in the waveguide operation is |
| A. | reflection |
| B. | refraction |
| C. | total internal reflection |
| D. | adsorption |
| Answer» D. adsorption | |
| 241. |
Identify the material which is not present in a transmission line setup. |
| A. | waveguides |
| B. | cavity resonator |
| C. | antenna |
| D. | oscillator |
| Answer» E. | |
| 242. |
The characteristic impedance of a transmission line is normally chosen to be |
| A. | 50 |
| B. | 75 |
| C. | 50 or 75 |
| D. | 100 |
| Answer» D. 100 | |
| 243. |
The average power in an electromagnetic wave is given by |
| A. | propagation constant |
| B. | pointing vector |
| C. | phase constant |
| D. | attenuation constant |
| Answer» C. phase constant | |
| 244. |
For a matched line, the input impedance will be equal to |
| A. | load impedance |
| B. | characteristic impedance |
| C. | output impedance |
| D. | zero |
| Answer» C. output impedance | |
| 245. |
wave ratio of 2.5 is |
| A. | 20 |
| B. | 125 |
| C. | 200 |
| D. | 75 |
| Answer» C. 200 | |
| 246. |
ohm is |
| A. | 50 |
| B. | 20 |
| C. | 1000 |
| D. | 125 |
| Answer» E. | |
| 247. |
. Which of the following parameters is not a primary parameter? |
| A. | resistance |
| B. | attenuation constant |
| C. | capacitance |
| D. | conductance |
| Answer» C. capacitance | |