Below are the answers key for the Multiple Choice Questions in Microwave Communications Part 6.

251. is equal to the actual cross-sectional area for small targets

252. fading

253. coaxial

254. increased capture area

255. Klystrons

256. horn

257. fading

258. 4

259. 2

260. frequency multiplier

261. FSL

262. permanent magnet

263. 90 mph

264. carrier to noise ratio

265. 0.09 %

266. CFA

267. noise factor

268. 20 kW

269. focal point

270. cavity resonators

271. cassegrain feed

272. 3.24 dB

273. BWO

274. 32.8 mi

275. they are reflected from the walls but do not travel along them

276. 10 nmi

277. they would be too bulky at lower frequencies

278. 23 dB

279. is greater than in free space

280. 7.5 GHz

281. transmission lines use the principal mode of propagation, and therefore do not suffer from low-frequency cut-off

282. peak power

283. double range echoes

284. are less bulky

285. any of these

286. transverse magnetic

287. any of these

288. greater than in the actual direction of propagation

289. 2000 yd

290. phase velocity

291. rest time

292. the wavelength within the waveguide becomes infinite

293. pulse width

294. TE20

295. pulse repetition frequency

296. the resulting impedance can be matched directly to coaxial lines

297. radars

298. to compensate for discontinuities at the join

299. cavity resistance

300. E-plane T

#### Questions and Answers in Microwave Communications and Principles Series

Following is the list of multiple choice questions in this brand new series:

**MCQ in Microwave Communications**

**MCQ from Number 1 – 50**Answer key:

**PART 1**

**MCQ from Number 51 – 100**Answer key:

**PART 2**

**MCQ from Number 101 – 150**Answer key:

**PART 3**

**MCQ from Number 151 – 200**Answer key:

**PART 4**

**MCQ from Number 201 – 250**Answer key:

**PART 5**

**MCQ from Number 251 – 300**Answer key:

**PART 6**

**MCQ from Number 301 – 350**Answer key:

**PART 7**

**MCQ from Number 351 – 400**Answer key:

**PART 8**

**MCQs from Number 401 – 450**Answer key:

**PART 9**

**MCQs from Number 451 – 500**Answer key:

**PART 10**

### Complete List of MCQ in Communications Engineering per topic