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# MCQ in Broadcasting and Cable TV System Part 6 | ECE Board Exam

This is the Multiples Choice Questions Part 6 of the Series in Broadcasting and Cable TV System as one of the Communications Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies, Communications Books, Journals and other Communications References.

#### Online Questions and Answers Topic Outline

• MCQ in Radio Transmitter
• MCQ in AM and FM
• MCQ in Television
• MCQ in Studio (Microphone, Amplifiers, Cameras, Lighting, etc.)
• MCQ in Cable Television

#### Continue Practice Exam Test Questions Part 6 of the Series

251. In stereophonic broadcast, the center frequency of each SCA Subcarrier shall be kept at all times within _______ Hz of the authorized frequency.

a. 200

b. 300

c. 400

d. 500

Solution:

252. Sawtooth generator circuits produce the scanning raster but the sync pulses are needed for

a. linearity

b. timing

c. keystoning

d. line pairing

Solution:

253. Which of the following camera tubes has minimum lag?

a. Vidicon

b. Plumbicon

c. Saticon

d. Iconoscope

Solution:

254. The service are in standard AM broadcast is described as ______ if there is no fading of signal.

a. Class A

b. Secondary

c. Class B

d. Primary

Solution:

255. The vertical field-scanning frequency is ______ Hz.

a. 30

b. 60

c. 525

d. 15,750

Solution:

256. A 4.5-MHz signal which is equal to the difference between the picture and sound RF carrier frequencies in a 6-MHz TV channel.

a. Audio frequency

b. Video frequency

c. Intercarrier frequency

d. Subcarrier frequency

Solution:

257. A system where the modulated RF picture and sound carrier signals are distributed in a cable network, instead of wireless system.

a. CCTV

b. MATV

c. CATV

d. SATV

Solution:

258. A class A FM station is limited in antenna height of ______ feet above average terrain.

a. 1000

b. 2000

c. 4000

d. 5000

Solution:

259. What circuit in the TV receiver is used to develop the high voltage needed to operate the picture tube?

a. Low-voltage power supply

b. Horizontal output

c. Vertical sweep

d. Sync separator

Solution:

260. The modulated picture carrier wave includes the composite video signal as the

a. Average carrier level

b. Symmetric envelope of amplitude variations

c. Lower sideband without the upper sideband

d. Upper envelope without the lower envelope

Solution:

261. With which emission type is the capture-effect more pronounced?

a. CW

b. FM

c. SSB

d. AM

Solution:

262. The hue of color sync phase is

a. red

b. cyan

c. blue

d. yellow green

Solution:

263. How much is the equivalent internal resistance of the electron beam with a 1.2-mA beam current at 25 kV?

a. 48 nano ohms

b. 30 ohms

c. 20.8 mega ohms

d. 15.6 kilo ohms

Solution:

264. The difference between the picture and sound carrier frequencies for channel 3 is ______ MHz.

a. 3.58

b. 64.5

c. 4.5

d. 6.75

Solution:

265. Refers to the deviation of the operating frequency of a crystal oscillator from its nominal value due to temperature variations.

a. drift

b. flashover

c. frequency deviation

d. deviation ratio

Solution:

266. It is the measure of how many picture elements can be reproduced

a. definition

b. resolution

c. detail

d. any of these

Solution:

267. A 3.58-MHz subcarrier signal for color in television

a. Hue signal

b. Video signal

c. Audio signal

d. Chroma signal

Solution:

268. A class D FM station shall have an authorized power not exceeding ______ watts.

a. 20

b. 15

c. 10

d. 5

Solution:

269. Which of the following is not a benefit of cable TV?

a. Lower-cost reception

b. Greater stability

c. Less noise, stronger signal

d. Premium cable channels

Solution:

270. The width of the vertical sync pulse in the Philippine TV system is

a. 21H

b. 3H

c. H

d. 0.5H

Solution:

271. Term in communication which is referred, โto send out in all directionโ

a. announce

c. transmit

d. media

Solution:

272. The number of frames per second in the Philippine TV system is

a. 60

b. 262 ยฝ

c. 4.5

d. 30

Solution:

273. It means multiple outlines of edges to the right in the picture.

a. ghosting

b. ringing

d. snowing

Solution:

274. In the Sawtooth waveform for linear scanning,

a. the linear rise is for flyback

b. the complete cycle includes trace and retrace

c. the sharp reversal in amplitude produces trace

d. the beam moves faster during trace and retrace

Solution:

275. The purpose of pre-emphasis and de-emphasis in FM broadcasting is to:

a. increase the high frequency amplitude

b. improve the audio harmonic

c. decrease the low frequency amplitude

d. improve the S/N ratio

Solution:

276. The part of the visible spectrum where camera pickup tubes have the greatest output is

a. red

b. blue

c. yellow-green

d. infrared

Solution:

277. The type of modulation of the sound carrier signal is ______.

a. Pulse motion

b. Phase modulation

c. Amplitude modulation

d. Frequency modulation

Solution:

278. A video or audio signal that can be used directly to reproduce the picture and sound.

a. Baseband signal

c. Electromagnetic wave signal

d. Modulated signal

Solution:

279. Class B FM station should have an ERP not exceeding ______ kW.

a. 50

b. 40

c. 30

d. 20

Solution:

280. What technique is used to permit hundreds of TV signals to share a common cable?

a. Frequency modulation

b. Mixing

c. Frequency division multiplexing

d. Time division multiplexing

Solution:

281. Another name for the horizontal retrace in a TV receiver is the

a. ringing

b. burst

c. damper

d. flyback

Solution:

282. In the Philippine color television system, the intercarrier frequency, in MHz, is

a. 3.58

b. 3.579645

c. 4.5

d. 45.75

Solution:

283. In channel 14 (470 to 476 MHz), the 3.58-MHz color signal is transmitted at

a. 471.25 MHz

b. 473.25 MHz

c. 474.83 MHz

d. 475.25 MHz

Solution:

284. Interlaced scanning eliminates

a. snowing

b. flicker

c. distortion

Solution:

285. Beam alignment magnets for the camera tube are adjusted while rocking which color?

a. Optical focus

b. Electrical focus

c. Beam current

Solution:

286. What is a frequency discriminator?

a. An FM generator

b. A circuit for detecting FM

c. A circuit for filtering two closely adjacent signals

d. An automatic bandwidth circuit

Solution:

287. A system used in television field operation to make on-the-spot video tape recordings using portable TV cameras and VTRs.

a. SNG

b. ENG

c. HAFC

d. MATV

Solution:

288. Class B FM station shall have an authorized transmitter power not exceeding ______ kW.

a. 10

b. 100

c. 1000

d. 10000

Solution:

289. The total bandwidth of an NTSC TV signal is

a. 3.58 MHz

b. 4.5 MHz

c. 6 MHz

d. 10.7 MHz

Solution:

290. Referred to the oscillator signal โleak throughโ from a property neutralized amplifier such as a master oscillator power amplifier.

a. carrier

b. stray signal

c. back wave

d. loss wave

Solution:

291. Interlacing is used in television to

a. produce the illusion of motion

b. ensure that all lines on the screen are scanned, not merely the alternate ones

c. simply the vertical sync pulse train

d. avoid flicker

Solution:

292. Coaxial cable for distribution system has an impedance of

a. 50 ohms

b. 75 ohms

c. 150 ohms

d. 300 ohms

Solution:

293. The average voltage value of the 3.58-MHz modulated chrominance signal is

a. zero for most colors

b. close to black for yellow

c. the brightness of the color

d. the saturation of the color

Solution:

294. When does broadcast station conduct an equipment test?

a. during day time

b. during night time

c. during experimental period

d. at any time

Solution:

295. It causes the picture information to spread out or crowded at one end of the rater compared to the opposite end.

a. Linear scanning

b. Interlaced scanning

c. Non-linear scanning

d. Retrace

Solution:

296. If the camera cannot be placed far away enough to include everything in the scene, change the lens to one with a

a. lower f rating

b. higher f rating

c. longer focal length

d. shorter focal length

Solution:

297. Type of radio communication transmission utilizing frequency modulation technique

a. television video

b. broadcasting in 535-1606 kHz

c. single sideband HF transmission

d. television audio

Solution:

298. The amount of color in the picture or color intensity in the ______.

a. color level

b. chroma level

c. saturation

d. any of these

Solution:

299. One of the early radio transmitters which produced keyed carrier generating purer waveform than spark transmitter, used for high powered RF transmission and are limited to radio frequency of about 500 kHz.

a. Arc transmitter

b. Hartley transmitter

c. Spark transmitter

d. Frequency transmitter

Solution:

300. A technique where segments of videotape are joined by electronic erasing and recording to create a single program.

b. segmenting

c. editing

d. programming

Solution:

#### Questions and Answers in Broadcasting and Cable TV System Series

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

MCQ in Broadcasting and Cable TV System
PART 1: MCQ from Number 1 โ 50                        Answer key: PART 1
PART 2: MCQ from Number 51 โ 100                   Answer key: PART 2
PART 3: MCQ from Number 101 โ 150                 Answer key: PART 3
PART 4: MCQ from Number 151 โ 200                 Answer key: PART 4
PART 5: MCQ from Number 201 โ 250                 Answer key: PART 5
PART 6: MCQ from Number 251 โ 300                 Answer key: PART 6
PART 7: MCQ from Number 301 โ 350                 Answer key: PART 7
PART 8: MCQ from Number 351 โ 400                 Answer key: PART 8
PART 9: MCQ from Number 401 โ 450                 Answer key: PART 9
PART 10: MCQ from Number 451 โ 500                 Answer key: PART 10

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

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