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# MCQ in Broadcasting and Cable TV System Part 9 | ECE Board Exam

This is the Multiples Choice Questions Part 9 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 9 of the Series

401. The number of lines per second in the TV system is

A. 31,500

B. 15,700

C. 262 ยฝ

D. 525

Solution:

402. In a basic transmitter, ________is a kind of transmitter that develops type B emission.

A. Arc

B. Spark

C. Alexanderson

D. High end

Solution:

403. It is a number that indicates how contrast is expanded or compressed.

A. Alpha

B. Beta

C. Gamma

D. Sigma

Solution:

404. Color picture tubes have ______ guns for its phosphors.

A. 1

B. 2

C. 3

D. 4

Solution:

405. The FM broadcast band is divided into _____ channels are suggested by KBP.

A. 200

B. 100

C. 50

D. 25

Solution:

406. The output of the vertical amplifier, applied to the yoke in a TV receiver, consists of

A. Direct current

B. Amplified vertical sync pulse

C. A sawtooth voltage

D. A sawtooth current

Solution:

407. The frequency spectrum of the stereophonic FM signal.

A. 67 kHz

B. 59.5 kHz to 74.5 kHz

C. 19 kHz to 38 kHz

D. 30 kHz to 53 kHz

Solution:

408. What is the video frequency response corresponding to the horizontal resolution of 200 lines?

A. 4 MHz

B. 1.5 MHz

C. 4.5 MHz

D. 2.5 MHz

Solution:

409. The gamma of the picture tube is

A. 0.4545

B. 1.0

C. 1.4

D. 2.2

Solution:

410. It is the instantaneous departure of the frequency of the emitted wave from the center frequency resulting from modulation.

A. Deviation

B. Frequency swing

C. Phase shift

D. Deviation ratio

Solution:

411. If a TV sound transmitter has a carrier frequency of 197.75 MHz, the picture carrier is

A. 191.75 MHz

B. 193.25 MHz

C. 202.25 MHz

D. 203.75 MHz

Solution:

412. The number of lines per field in the Philippine TV system is

A. 262 ยฝ

B. 525

C. 30

D. 60

Solution:

413. What is the best site of an AM broadcast transmitter?

A. Marshy land

B. Dry land

C. Highly elevated

D. Average terrain

Solution:

414. What is the hue of a color 90 degrees leading sync burst phase?

A. Yellow

B. Cyan

C. Blue

D. Orange

Solution:

415. The two black conductive coatings of picture tubes are made up of

A. Phosphor

C. Cavity

D. Nickel

Solution:

416. The maximum power allocation of AM transmitter in Metro Manila in kW is

A. 10 kW

B. 20 kW

C. 40 kW

D. 30 kW

Solution:

417. The function of the serrations in the composite video waveforms is to

A. Equalize the change in the integrator before the start of vertical retrace

B. Help vertical synchronization

C. Help horizontal synchronization

D. Simplify the generation of the vertical sync pulse

Solution:

418. Which system uses a light beam for playback?

A. CED

B. VHD

C. Betamax

D. VLP

Solution:

419. Weak emission from one cathode in a tricolor picture tube causes

A. A weak picture

B. A long warm-up time

C. A color imbalance in the raster and picture

D. All of these

Solution:

420. In AM broadcast, the current carrier shift at any percentage of modulation shall not exceed

A. 5%

B. 15%

C. 20%

D. 2.5%

Solution:

421. Indicate which voltages are not found in the output of a normal monochrome receiver video detector.

A. Sync

B. Video

C. Sweep

D. Sound

Solution:

422. The sawtooth waveform for deflection provides _______.

A. Horizontal deflection

B. Distortions

C. Linear scanning

D. Flicker

Solution:

423. In AM broadcast, the transmitter must be capable of maintaining the operating frequency within the limits of ______.

A. +/- 10 Hz

B. +/- 20 Hz

C. +/- 25 Hz

D. +/- 75 Hz

Solution:

424. How much illumination in lux a 400-candlepower make that is 3 meters from the surface?

A. 133.3

B. 1200

C. 200

D. 44.4

Solution:

425. Brightness variations of the picture information are in which signal?

A. I

B. Q

C. Y

D. R-Y

Solution:

426. How many octaves is the frequency range of 1 to 8 MHz?

A. 1

B. 2

C. 3

D. 8

Solution:

427. For television, the maximum deviation of the FM sound signal in kHz.

A. 10

B. 25

C. 75

D. 100

Solution:

428. Indicate which of the following signals is not transmitted in color TV

A. Y

B. Q

C. R

D. I

Solution:

429. Emission outside of the assigned channel, as a result of the modulation process.

A. Over modulation

B. Spurious emission

C. Out-of-band emission

D. In band emission

Solution:

430. Determine which of the following is not part of RF section of a radio transmitter.

A. Master oscillator

B. Buffer amplifier

C. AF voltage amplifier

D. Frequency amplifier

Solution:

431. The power of any conducted spurious emission shall be attenuated below the maximum level of carrier frequency in accordance with the following formula:

A. Attenuation (dB) = 43 + 20 log P

B. Attenuation (dB) = 43 + log P

C. Attenuation (dB) = 43 + 10 log P

D. Attenuation (dB) = 43 + log P/10

Solution:

432. In television, gamma affects _____

A. Color

B. Contrast

C. Brightness

D. Hue

Solution:

433. In the IRE scale for the composite video signal, what is the number of IRE units for sync?

A. 7.5

B. 92.5

C. 40

D. 10

Solution:

434. As prescribed by the technical standards for Cable Television operation and in order to be compatible for any value added services in the future, Trunk cable should have a minimum diameter of _______.

A. 0.25 inch

B. 0.5 inch

C. 0.75 inch

D. 1.0 inch

Solution:

435. Compared with 100 percent saturation, the desaturated color have

A. More luminance for the Y signal

B. Less luminance for the Y signal

C. More chrominance for the C signal

D. Less hue for the C signal

Solution:

436. What is the practical baseband frequency for the color video signal?

A. 1 MHz

B. 2 MHz

C. 0.2 MHz

D. 0.5 MHz

Solution:

437. What is the diagonal screen size for the 19CP4 picture tube?

A. 21

B. 23

C. 4

D. 19

Solution:

438. What is the phase angle between B โ Y and R โ Y?

A. 180 deg

B. 45 deg

C. 90 deg

D. 270 deg

Solution:

439. How many gray scale steps are in the EIA test pattern in television?

A. 10

B. 40

C. 50

D. 15

Solution:

440. In TV, degaussing is done with _____.

A. Direct current

B. Pulsed current

C. Alternating current

D. Any of these

Solution:

441. R, G and B video drive controls set for ________.

A. Black

B. Dark gray

C. White

D. Light gray

Solution:

442. What is the phase difference between the color sync burst and the B โ Y video?

A. 180 deg

B. 45 deg

C. 90 deg

D. 270 deg

Solution:

443. What is the hue of the color sync burst?

A. Yellow-green

B. Red

C. Blue

D. Orange

Solution:

444. What synchronizes the horizontal of the TV picture tube?

A. HSC

B. HAFC

C. HFC

D. HAC

Solution:

445. What is the typical anode voltage for a 25-inch color picture tube?

A. 3 kV

B. 20 kV

C. 10 kV

D. 30 kV

Solution:

446. In television, what is the phosphor number for monochrome picture tube?

A. P4

B. P21

C. P22

D. P3

Solution:

447. In television picture tube, what is the color of the P1 phosphor?

A. Red

B. Green

C. Yellow

D. Blue

Solution:

448. What video frequency corresponds to 240 lines of horizontal resolution?

A. 1 MHz

B. 3 MHz

C. 2 MHz

D. 4 MHz

Solution:

449. The minimum FM broadcast transmitter power in metro manila and metro cebu is

A. 25 kW

B. 10 kW

C. 1 kW

D. 30 kW

Solution:

450. The maximum power suggested by KBP on 919-1312 AM broadcast station in Metro Manila.

A. 10 kW

B. 20 kW

C. 15 kW

D. 5 kW

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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