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# MCQ in Broadcasting and Cable TV System Part 8 | ECE Board Exam

This is the Multiples Choice Questions Part 8 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 AM and FM
• MCQ in Television
• MCQ in Studio (Microphone, Amplifiers, Cameras, Lighting, etc.)
• MCQ in Cable Television

#### Continue Practice Exam Test Questions Part 8 of the Series

351. What is the horizontal scanning time for 20 pixels?

A. 2.5 microseconds

B. 0.25 microseconds

C. 1.25 microseconds

D. 125 microseconds

Solution:

352. In basic radio transmitter, the main advantage of a single-tube transmitter is

A. Frequency instability

B. Non-portable

C. Heating effect

D. Bulky

Solution:

353. The carrier transmitted 1.25 MHz above the bottom frequency in a Philippine TV channel is the

A. Sound carrier

B. Chroma carrier

C. Intercarrier

D. Picture carrier

Solution:

354. In camera tubes, it means that the old image remains too long after the picture information on the target plate has changed.

A. Light lag

B. Switch lag

C. Image lag

D. Camera lag

Solution:

355. What is the maximum color TV bandwidth?

A. 1.6 MHz

B. 0.5 MHz

C. 1.0 MHz

D. 1.3 MHz

Solution:

356. Class of FM station where its authorized power should not exceed 15 kW.

A. Class A

B. Class B

C. Class C

D. Class D

Solution:

357. What is the name of the solid state imaging device used in TV cameras that converts the light in a scene into an electrical signal?

A. CCD

B. Phototube matrix

C. Vidicon

D. MOSFET array

Solution:

358. The signals sent by the transmitter to ensure correct scanning in the receiver is called

A. Sync

B. Chroma

C. Luminance

D. Video

Solution:

359. What signals are transmitted by a SSBSC transmitter when no modulating signal is present?

A. The upper sideband only

B. Both the upper and lower sideband

C. The lower sideband

D. No signal transmitted

Solution:

360. The second IF value for color in receivers, for any station, is

A. 0.5 MHz

B. 1.3 MHz

C. 3.58 MHz

D. 4.5 MHz

Solution:

361. In the frame for which interfaced scanning is used, alternate lines are skipped during vertical scanning because

A. The trace is slower than retrace

B. The vertical scanning frequency is doubled from 30 to 60 Hz

C. The horizontal scanning is slower than vertical scanning

D. The frame has a 4:3 aspect ratio

Solution:

362. A typical value of vidicon dark current is

A. 0.2 microampere

C. 8 milliampere

D. 800 milliampere

Solution:

363. The smallest are of light or shade in the image is a picture element called

A. Chroma

B. Hue

C. Contrast

D. Pixel

Solution:

364. An entry of the time the station begins to supply power to the antenna and the time it stops.

A. Operating log entries

B. Program log entries

C. Operating schedule

D. Any of these

Solution:

365. What type of circuit is used to modulate and demodulate the color signals?

A. Phase-locked loop

B. Differential peak detector

D. Balanced modulator

Solution:

A. Aural BC intercity relay

C. Short wave station

D. Remove pick-up

Solution:

367. Indicate which of the following frequencies will not be found in the output of a normal TV receiver tuner.

A. 4.5 MHz

B. 41.25 MHz

C. 45.75 MHz

D. 42.17 MHz

Solution:

368. In all standard television broadcast channels , the difference between the picture and sound carrier frequencies is

A. 0.25 MHz

B. 1.25 MHz

C. 4.5 MHz

D. 6 MHz

Solution:

369. It is caused by phase distortion for video frequencies of about 100 kHz and lower.

A. Streaking

B. Snowing

C. Ringing

Solution:

370. Special effects and production switching are done by the

A. CCU

B. ENG camera

C. SEG

D. Sync generator

Solution:

371. A picture has 400 horizontal and 300 vertical picture elements. What is the total number of details in the picture?

A. 120,000

B. 700

C. 0.75

D. 100

Solution:

372. After the IF stages have been aligned, the next stage to align in FM receiver is

A. Local oscillator

B. Limiter stage

C. RF amplifier

D. Mixer stage

Solution:

373. What ensures proper color synchronization at the receiver?

A. Sync pulses

C. 4.5-MHz intercarrier sound

D. 3.58-MHz color burst

Solution:

374. The interfering beat frequency of 920 kHz is between the 3.58-MHz color subcarrier and the

A. 4.5-MHz intercarrier sound

B. Picture carrier

Solution:

375. Light is converted to video signal by the _____ tube.

A. Camera tube

B. Picture tube

C. Anode tube

D. Cathode tube

Solution:

376. The frequency spectrum of the stereophonic FM signal.

A. 67 kHz

B. 59.5 to 74.5 kHz

C. 19 to 38 kHz

D. 30 to 53 kHz

Solution:

377. Equalizing pulses in TV are sent during

A. Horizontal blanking

B. Vertical blanking

C. The serrations

D. The horizontal retrace

Solution:

378. Which signal has color information for 1.3 MHz bandwidth?

A. I

B. Y

C. R-Y

D. B-Y

Solution:

379. It is the distance from the center of the lens of the camera to the point at which parallel rays from a distant object come to a common focal point.

A. Focal length

B. Latus rectum

C. Major axis

D. Minor axis

Solution:

380. The method of generating FM used by broadcast station is

A. Direct

B. Indirect

C. Insertion

D. All of these

Solution:

381. The picture and sound carrier frequencies in a TV receiver IF are respectively.

A. 41.25 and 45.75 MHz

B. 45.75 and 41.25 MHz

C. 41.75 and 45.25 MHz

D. 45.25 and 41.75 MHz

Solution:

382. The channel width in the Philippine TV system, in MHz, is

A. 41.25

B. 6

C. 4.5

D. 3.58

Solution:

383. The cable converter output or the TV receiver is usually on channel

A. 3

B. 6

C. 7

D. 9

Solution:

384. One-half line spacing between the start positions for scanning even and odd fields produces

A. Linear scanning

B. Line pairing

C. Fishtailing

D. Exact interlacing

Solution:

385. Precise scanning size and linearity are most important in

A. A black-and-white camera

B. Plumbicon

C. A single-tube color pickup

D. A saticon

Solution:

386. A signal in which the sum of all signals which frequency-modulates the main carrier.

A. Composite baseband signal

B. FM baseband

C. Main channel signal

D. Stereophonic signal

Solution:

387. What is the total number of interlaced scan lines in one complete frame of a NTSC Philippine TV signal?

A. 262 ยฝ

B. 525

C. 480

D. 625

Solution:

388. The video voltage applied to the picture tube of a television receiver is fed in

A. Between grid and ground

B. To the yoke

C. To the anode

D. Between the grid and cathode

Solution:

389. How many dBmV units correspond to a 1-mV signal level?

A. 0

B. 1

C. 3

D. 6

Solution:

390. In color television, it is made to maintain neutral white from low to high levels of brightness.

Solution:

391. Average power of a radio transmitter supplied to the antenna transmission line by a transmitter during one radio frequency cycle taken under the condition or no modulation.

A. Peak envelope power

B. Rated power

C. Carrier power

D. Mean power

Solution:

392. The number of scanning lines is ____ per second.

A. 525

B. 262 ยฝ

C. 15,750

D. 30

Solution:

393. The ratio of the actual frequency swing to the frequency swing defined as 100 percent modulation, expressed in percentage.

A. Modulation index

B. Deviation ration

C. Maximum deviation

D. Percentage modulation

Solution:

394. In a TV receiver, the color killer

A. Cuts off the chroma stages during monochrome reception

B. Ensures that no color is transmitted to monochrome receivers

C. Prevents color coding

D. Make sure that the color burst is not mistaken for sync pulses, by cutting off reception during the back porch.

Solution:

395. How many TV fields are recorded on one slant track of tape?

A. 1

B. 2

C. 4

D. 60

Solution:

396. A communication circuit using class C amplifier is considered a narrow band amplifier if the bandwidth is less than _____ % of its resonant frequency.

A. 15

B. 13

C. 10

D. 20

Solution:

397. The width of a vertical sync pulse with its serrations includes the time of

A. Six half-lines, or three lines

B. Five lines

C. Three half-lines

D. Five half-lines

Solution:

398. A low-contrast picture in which white seems flat and lacking in detail suggests

A. Low beam current

B. High gain in the pre-amplifier

C. Excessive gamma

D. Insufficient scanning width

Solution:

399. The product of the transmitter power multiplied by the antenna power gain of the antenna field gain squared.

A. Field intensity

B. Field gain

C. ERP

D. Electric field strength

Solution:

400. What keeps the scanning process at the receiver in step with the scanning in the picture tube at the receiver?

A. Nothing

B. Sync pulses

C. Color burst

D. Deflection oscillators

Solution:

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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