PinoyBIX Engineering Problem Solving and Reference

Below are the answers key for the Multiple Choice Questions in Noise - MCQs Part 5.

201. -13 dBm

202. 31.6 µW

203. 3.98 dB

204. Reduced by a factor of 10

205. Noise

206. Attenuation

207. Distortion

208. Amplification

209. Equalization

210. Interference

211. Interference

212. Noise figure

213. A or C

214. Above 30 MHz

215. All of the above

216. Distant stars produce atmospheric noise

217. Noise temperature, Te = (F – 1)290

218. RF amplifier

219. 1.5 dB

220. dBa

221. dBa0

222. 1.656 x 10^-14 Watts

223. dBmC

224. dBmCo

225. line inductance

226. All of the above

227. pWp

228. Atmospheric noise

229. Transmission over power lines and by ground wave

230. Noise factor

231. Noise improvement factor

232. Peak values

233. Precipitation static

234. 8 MHz to 1.43 GHz

235. 15 to 160 MHz

236.  Transit-time

237. Greater than 1

238. Amplification noise

239. Background noise

240. Ignition noise

241. dBk

242. Man-made noise

243. Noise equivalent bandwidth

244. Noise-equivalent temperature

245. Noise filter

246. Noise floor

247. Noise limiter

248. Noise pulse

249. Noise quieting

250. Circuit noise

Online Questions and Answers Series

Following is the list of Practice Exam Test Questions in this brand new series:

Complete List of MCQs in Communications Engineering per topic

---

Below are the answers key for the Multiple Choice Questions in Satellite Communications - MCQs Part 7.

301. Geosynchronous satellites require higher transmit powers and more sensitive receivers because of the longer distances and greater path loss.

302. 100 – 300 mi; 17,500 mi/hr; 1 ½ hr, and ¼ or less per orbit, respective

303. spinners and three-axis stabilizer satellites

304. All of these

305. Geostationary satellite

306. High-altitude satellites (geosynchronous orbit)

307. Equatorial orbit

308. All are correct

309. Rotation that takes over the north and south poles, and any other orbital path, respectively

310. Apogee and perigee, respectively

311. Line of apsides

312. Descending node and ascending node, respectively

313. Line of nodes

314. Azimuth

315. A or C is right

316. From 1 GHz up to 30 GHz

317. Transponder

318. By using different carrier frequencies

319. All of the above

320. Uplink and downlink, respectively

321. A and B are correct

322. All of these

323. All of the above

324. All of these are correct

325. A or C is right

326. Using small on-board rocket trusters

327. Power subsystem

328. By a bank of batteries whose charge is maintained by an array of solar cells

329. About 150 W

330. Increases

331. Repeater

332. Transponder

333. Geostationary orbit

334. Gravitational pull and inertia

335. 22,300 mi

336. 3 GHz to 30 GHz

337. Solar cells

338. Apogee

339. During eclipse periods

340. Telemetry, tracking, and command subsystem

341. Spin

342. Maintain altitude

343. C and Ku

344. Frequency reuse

345. 500 MHz

346. Modulator

Online Questions and Answers Series

Following is the list of Practice Exam Test Questions in this brand new series:

Complete List of MCQs in Communications Engineering per topic

---

Below are the answers key for the Multiple Choice Questions in Satellite Communications - MCQs Part 6.

251. Telstar

252. DAMA

253. Frequency Hopping

254. Dual polarization

255. 3950

256. Active

257. Kepler’s First Law

258. Apogee

259. Sputnik

260. Uplink

261. Communication satellite

262. Elevation

263. Polar

264. Second Law

265. CDMA

266. Ascending Node

267. Earth coverage

268. 257

269. Payload

270. Payload

271. 3 – 6 degrees

272. LNB

273. Gallium Arsenide solar panel

274. Satellite radiation pattern

275. Satellite network

276. Telstar I

277. 5925 MHz

278. C-band

279. Ion propulsion system

280. Moon

281. Intelsat

282. 38

283. Effective boresight area

284. Communication satellite

285. To compensate for the antenna limitations

286. 90,000 km and about 300 ms, respectively

287. Elliptical

288. All of these

289. All of the above

290. A and B are correct

291. All of the above

292. 5 to 20 years

293. A and B are correct

294. GPS

295. All of these

296. Control segment

297. To transmit time codes and orbital position information to the users

298. Begins at a ground station, proceeds to an uplink, to the satellite itself, to a downlink, and ends at a receiving ground station

299. A bent-pipe or a reflector which bounces a signal from one place to another.

300. A or B is correct

Online Questions and Answers Series

Following is the list of Practice Exam Test Questions in this brand new series:

Complete List of MCQs in Communications Engineering per topic

---

Below are the answers key for the Multiple Choice Questions in Microwave Communications - MCQs Part 11.

501. Directional coupler

502. ruby

503. LASER

504. Slightly

505. Magnetic field

506. TWT

507. Radar

508. Reactance

509. Filter circuit

510. 8

511. Frequency pushing

512. Cut-off frequency

513. TM

514. Attenuator

515. 2.94 GHz

516. 6.83 cm, 3.34 cm, 420 ῼ

517. 6 cm, 166 Mm/sec,543 Mn/sec

518. 0.00025

519. 10,000 watts

520. Gunn diode

521. Tunnel

522. PIN diode

523. Point contact diode

524. ESBAR

525. Backward diode

526. Capacitance

527. Step recovery

528. CFA

529. Attenuator

530. Si BJT

531. Schottky Barrier Gate

532. BWO

533. TWT and Klystron

534. EIA

535. Quartz crystal

536. Single frequency

537. Is an oscillator

538. Stripline

539. TWT

540. BWO

541. CFA

542. Prevent oscillation

543. Provide attenuation

544. Prevent mode jumping

545. Are less bulky

546. The characteristic impedance of the guide becomes infinite

547. Are more likely to radiate

548. E-plane T

549. Suitable for use as a microwave switch

550. Rectangular waveguide

Online Questions and Answers Series

Following is the list of Practice Exam Test Questions in this brand new series:

Complete List of MCQs in Communications Engineering per topic

---

Below are the answers key for the Multiple Choice Questions in Microwave Communications - MCQs Part 10.

451. 12 GHz

452. Frequency diversity

453. Window

454. Space waves

455. UHF

456. Ducting

457. The Faraday effect

458. Microstrip

459. Hollow metal tube used for transmission of microwave energy

460. Waveguides

461. Ridge

462. TE2,0

463. Transverse magnetic

464. Is greater than in free space

465. Are reflected from walls but not travel along them

466. Deducting

467. H-mode

468. Fade Margin

469. Diversity

470. All of the preceding

471. All of the above

472. Grazing Path

473. To reshape the pulses after they have become distorted

474. 60%

475. Fresnel zone

476. They are bulky at lower frequencies

477. duplexer

478. Radio path profile

479. Direct

480. λ/2

481. 0.6

482. Threshold

483. X

484. Fade Margin

485. 99.9%

486. Contour lines

487. TE1,0

488. Group velocity

489. TE1,1

490. Ridge

491. n

492. H

493. Cut-off

494. Higher than

495. Flanges

496. High

497. Coaxial

498. Waveguide below cut-off

499. Iris

500. Post

Online Questions and Answers Series

Following is the list of Practice Exam Test Questions in this brand new series:

Complete List of MCQs in Communications Engineering per topic

---

Below are the answers key for the Multiple Choice Questions in Antennas - MCQs Part 10.

451. Yagi-uda

452. Beamwidth

453. 6 dB over the gain of one antenna

454. 0 dB

455. 2.6

456. Effective height

457. Horizontally polarized

458. 42.9 MHz

459. Space diversity

460. Smith chart

461. Beamwidth

462. Antenna gain

463. Center of the antenna

464. By installing a good ground radial system

465. Loading coil

466. The frequency range over which an antenna can be expected to perform well

467. At feed point

468. Whip

469. A non-radiating load for a transmitter used for testing

470. Bidirectional

471. The element fed by the transmission line

472. Resonant

473. Maximum voltage and minimum current

474. Yagi antenna

475. An equivalent resistance that would dissipate the same amount of power as that radiated from an antenna

476. Antenna

477. -26 dB

478. Antenna efficiency

479. Use of grounded antenna

480. Longer the length

481. Aperture antenna

482. Provide loading coil

483. λ/4

484. An element that receives its excitation from mutual coupling rather than from a transmission line.

485. Direction finder

486. Reduce power

487. Reflector element is 5% longer

488. Their frequencies are low and need very large antennas

489. Provide a multiband operation

490. Antenna gain

491. About 5% shorter

492. Radiation efficiency

493. Hertz

494. All of these

495. Radiation pattern

496. Front-to-back ratio

497. Near field

498. Antenna efficiency

499. Polarization

500. Counterpoise

Online Question and Answers Series

Following is the list of Practice Exam Test Questions in this brand new series:

Complete List of MCQs in Communications Engineering per topic

---

Below are the answers key for the Multiple Choice Questions in Antennas - MCQs Part 9.

401. Acts as an antenna array

402. The rhombic antenna

403. Log-periodic

404. Horn

405. Protection of personnel working underneath

406. To prevent reradiation of the local oscillator

407. Marconi

408. Protection of personnel working underneath

409. High gain

410. Helical

411. Isotropic antenna

412. Effective height

413. Allow the feed to be places at a convenient point

414. Reduce the bulk of the lens

415. Circular polarization

416. Useful as a UHF receiving antenna

417. Log-periodic

418. Vertical

419. Angle of elevation

420. Rhombic

421. Orthomode transducer

422. 10.89 times

423. Standing waves

424. 200 kph

425. 3

426. Dummy antenna

427. Antenna

428. 28.17 dB

429. bi-directional

430. Aperiodic

431. Dipole

432. Low-pass filter

433. 1.76 dB

434. Circular polarization

435. Smith chart

436. Isotropic

437. Effective isotropic radiated power

438. Spot beam

439. Fresnel

440. TVRO

441. Omnidirectional

442. Major lobe radiation

443. Parasitic elements

444. Reflectometer

445. ERP

446. Adding C in series

447. Gain of the antenna

448. Hertz

449. The numeric ratio relating the radiated signal strength of an antenna to that of another antenna

450. Broadside array

Online Questions and AnswersSeries

Following is the list of Practice Exam Test Question in this brand new series:

Complete List of MCQs in Communications Engineering per topic

---

Below are the answers key for the Multiple Choice Questions in Radiation and Wave Propagation - MCQs Part 8.

351. All of these

352. Oscillations that propagate through free space

353. Electric field

354. Electric field (E-field) and magnetic field

355. Wavefront

356. Ray

357. Power density

358. Field intensity

359. A or C is correct

360. Inductance

361. B or C is correct

362. A and B

363. A or C is right

364. Smaller value of dielectric constant

365. The ratio of velocity of light in free space to the velocity of light in a given material

366. A and B are incorporated

367. A and B

368. Is a reflection from a perfectly smooth surface

369. Rayleigh criterion

370. Standing waves

371. Interference

372. Isotropic source

373. 300,000 km/sec

374. Magnetic field

375. Measures power density, magnetic field intensity, and electric field intensity

376. Should take place at one medium

377. All of these

378. Ground wave

379. Gradient density

380. B and C

381. All of these

382. Radio horizon

383. All of the above

384. All of these

385. Duct propagation

386. Increase

387. Increasing refraction

388. B or C

389. A and C

390. E layer

391. F layer

392. Virtual height

393. Skip distance

394. Maximum usable frequency, MUF

395. Multihop transmission

396. Hop

397. Fading

398. Diversity techniques

399. Frequency diversity

400. Space diversity

Online Questions and Answers Series

Following is the list of Practice Exam Test Questions in this brand new series:

Complete List of MCQs in Communications Engineering per topic

---

Below are the answers key for the Multiple Choice Questions in Noise - MCQs Part 4.

151. 6 dB

152. A loss of one-half of the power

153. 1000 volts/volt

154. bel

155. Internal

156. Shot

157. 0.01

158. 2.23 & 194°K

159. Industrial

160. Unity

161. Atmospheric

162. Transmission Level Point

163. 50 watts

164. Transmit time

165. 43.3

166. 4 dB

167. 30

168. Predictable in character

169. 1.086

170. 174°K

171. 0.1151

172. 40 dBm

173. 8.14 uV

174.Unchanged

175. Input noise voltage

176. Noise

177. dB

178. External

179. Industrial

180. 6 dB

181. dBV

182. dB

183. 290 K

184. Extraterrestrial

185. Partition noise

186. Lightning

187. All of the above

188. Its temperature

189. In the channel

190. a and b

191. All of the above

192. Flicker noise

193. 500 MHz

194. A shot duration pulse

195. 23

196. –90 dBm

197. 90 degrees

198. 50

199. Impulse noise

200. S/N ratio

Online Questions and Answers Series

Following is the list of Practice Exam Test Questions in this brand new series:

Complete List of MCQs in Communications Engineering per topic

---

Below are the answers key for the Multiple Choice Questions in Radiation and Wave Propagation - MCQs Part 7.

301. The direction in which the electric plane is radiated.

302. Kenelly Heaviside Layers

303. Wave impedance

304. The field strength

305. Law of Reciprocity

306. VHF and above

307. Ground wave

308. space waves

309. diffraction

310. attenuation

311. Vertically and horizontally polarized separately

312. Horizontally

313. Permitivity

314. Huygen’s Principle

315. Velocity factor

316. Diffraction

317. Line of sight propagation wave

318. Radiation pattern

319. Permittivity

320. Surface wave propagation

321. Either a or b

322. Virtual height

323. Critical frequency

324. Both a and b

325. The magnitude of the incident is equal to the reflected waves

326. Refraction

327. Snell’s Law

328. D layer

329. Thermal inversion

330. E-layer

331. All of these

332. F layer

333. Space or direct

334. Inverse Square Law

335. 2

336. Sporadic E

337. Attenuation

338. Wave propagation

339. Carrier frequency

340. Transverse waves

341. Fading

342. They are very reliable

343. Affected by the solar cycle

344. To prevent sky-wave and upper ray interference

345. Tilting

346. Is due to the transverse nature of the waves

347. Log normal fading

348. Their frequency

349. Pass into a medium of different dielectric constant

350. Arises only with spherical wavefronts

Online Questions and Answers Series

Following is the list of Practice Exam Test Questions in this brand new series:

Complete List of MCQs in Communications Engineering per topic

---