MCQs in Broadcasting and Cable TV System Part VII

This is the Multiples Choice Questions Part 7 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

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

MCQs in Broadcasting and Cable TV System Series

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

Broadcasting and Cable TV System MCQs

PART 1: MCQs from Number 1 – 50                        Answer key: PART I

PART 2: MCQs from Number 51 – 100                   Answer key: PART II

PART 3: MCQs from Number 101 – 150                 Answer key: PART III

PART 4: MCQs from Number 151 – 200                 Answer key: PART IV

PART 5: MCQs from Number 201 – 250                 Answer key: PART V

PART 6: MCQs from Number 251 – 300                 Answer key: PART VI

PART 7: MCQs from Number 301 – 350                 Answer key: PART VII

PART 8: MCQs from Number 351 – 400                 Answer key: PART VIII

PART 9: MCQs from Number 401 – 450                 Answer key: PART IX

PART 10: MCQs from Number 451 – 500                 Answer key: PART X

SEE: More Questions and Answers in Broadcasting and Cable TV Systems

Continue Practice Exam Test Questions Part VII of the Series

301. A class C FM station has an authorized power not exceeding ______watts of ERP.

• a. 500
• b. 750
• c. 1000
• d. 2000

302. The assembly around the neck of a picture tube that produces the magnetic fields that deflect and scan the electron beams is called the _________.

• a. shadow mask
• b. phosphor
• c. electron gun
• d. yoke

303. An odd number of lines per frame form part of every one of the world’s TV systems. This is _____________________.

• a. done to assist interface
• b. purely an accident
• c. to ensure that line and frame frequencies can be obtained from the same original source
• d. done to minimize interference with the chroma subcarrier

304. The difference between the sound carrier and the color signal is

• a. 4.5 MHz
• b. 1.25 MHz
• c. 0.92 MHz
• d. 0.25 MHz

305. In color television, it is made for uniform color in the raster.

• a. beam-landing adjustment
• b. degaussing
• c. internal blanking adjustment
• d. background control

306. Which of the following camera tubes uses lead oxide for the photoconductive target plate?

• a. vidicon
• b. plumbicon
• c. saticon
• d. image orthicon

307. The number of fields is ______ per frame.

• a. 2
• b. 60
• c. 525
• d. 262.5

308. An RF carrier wave that is frequency – modulated by the baseband audio signal in TV broadcasting.

• a. Audio signal
• b. Video signal
• c. Intercarrier signal
• d. Color signal

309. A class B FM station is limited in antenna height of ____ feet.

• a. 1000
• b. 500
• c. 250
• d. 100

310. The HV anode supply for the picture tube of a TV receiver is generated in the

• a. mains transformer
• b. vertical output stage
• c. horizontal output stage
• d. horizontal deflection oscillator

311. A tap for the subscriber drop line has a

• a. high insertion loss
• b. high tap loss
• c. low tap loss
• d. 300-ohm impedance

312. Which system can be used for both recording and playback?

• a. CED
• b. VHD
• c. laser disk
• d. VHS

313. The hue 180 degrees out of phase with red is ______.

• a. cyan
• b. yellow
• c. green
• d. blue

314. It is used around the phosphor dots to make a darker black which improves contrast in the picture.

• a. black masking
• b. convergence adjustment
• c. shadow masking
• d. color parity adjustment

315. A lens with lower f rating is _____ lens that allows more light input.

• a. slower
• b. wider
• c. narrower
• d. faster

316. Picture frames are repeated at the rate of ___ per second.

• a. 30
• b. 60
• c. 45
• d. 50

317. The effective radiated power of a class A FM station should not exceed ______ kW.

• a. 125
• b. 30
• c. 10
• d. 1

318. In television, 4:3 represents the

• a. interface ratio
• b. maximum horizontal deflection
• c. aspect ratio
• d. ration of the two diagonals

319. Titling the video head gaps is necessary with the

• a. color under
• b. zero guard bands
• c. FM luminance signal
• d. Long – play tapes

320. It is a special camera tube with a test pattern printed in the image plate.

• a. vidicon
• b. monoscope
• c. oscilloscope
• d. iconoscope

321. The number of lines scanned per frame in the raster on the picture tube screen is

• a. 525
• b. 262 ½
• c. 20
• d. 10

322. One of the following is a high powered RF ac basic transmitter that has two or more stages, the oscillator stage which determines the frequency of operation and RF amplifier stage or stages that develop the high power output. The purpose of which is to develop a good frequency stability.

• a. MOPA
• b. Hartley
• c. Alexanderson
• d. Goldsmith

323. Camera signal output without sync is called ______.

• a. black burst
• b. generator lock video
• c. composite video
• d. non-composite video

324. The tint of the color is its _____.

• a. brightness
• b. contrast
• c. chroma
• d. hue

325. Which frequency band is the standard AM radio broadcast?

• a. HF
• b. UHF
• c. MF
• d. VHF

326. The I and Q composite color signals are multiplexed onto the picture carrier by modulating a 3.58 MHz subcarrier using

• a. FM
• b. PM
• c. DSB AM
• d. Vestigial sideband AM

327. The shadow mask in color picture tube is used to

• a. Reduce X-ray emission
• b. Ensure that each beam hits only its dots
• c. Increase screen brightness
• d. Provide degaussing for the screen

328. The video heads rotate at high velocity to increase the

• a. tape speed
• b. writing speed
• c. reel rotation
• d. tape tension

329. How do you eliminate radio frequency variation of an oscillator transmitter caused by its supply voltage?

• a. use of a regulated power supply
• b. use of a new power supply
• c. use of high capacitor in the supply circuit
• d. loosen power supply shielding

330. The composite video signal includes the camera signal with the following except

• a. picture information
• b. sync pulses
• c. blanking pulses
• d. camera signal

331. A lens has an 8-cm focal length and 4-cm diameter. Its f rating is

• a. 2
• b. 4
• c. 8
• d. 32

332. Which of the following is a possible cause for an abrupt frequency variation in a self – excited transmitter oscillator circuits resulting poor frequency stability to hold a constant frequency oscillation?

• a. DC and RF AC heating of resistor which cause a change in values
• b. Heating and expansion of oscillator coil
• c. Heating of capacitor in the oscillator
• d. Power supply voltage changes

333. How long does it take to scan 2 picture elements when 400 are scanned in 50 microseconds?

• a. 25 microsec
• b. 0.25 microsec
• c. 2.5 microsec
• d. 0.5 microsec

334. Anode voltage for the picture tube, developed from the output of the horizontal deflection circuit.

• a. Yoke voltage
• b. Flyback voltage
• c. Aquadag voltage
• d. Tube voltage

335. The channel spacing in the Philippine FM broadcast standards

• a. 400 kHz
• b. 800 kHz
• c. 600 kHz
• d. 200 kHz

336. What is the black-and-white or monochrome brightness signal in TV called?

• a. RGB
• b. Color subcarrier
• c. Q an I
• d. Luminance Y

337. Which of the following is a midband cable TV channel?

• a. 6
• b. 7
• c. 14
• d. 23

338. What is the primary purpose of an RF amplifier in a receiver?

• a. to vary the receiver image rejection by utilizing the AGC
• b. to provide most of the receiver gain
• c. to develop the AGC voltage
• d. to improve the receiver’s noise figure

339. The color with the most luminance is

• a. red
• b. yellow
• c. green
• d. blue

340. It is the light flux intercepted by a one-foot-square surface that is one-foot from a one-candlepower source.

• a. candela
• b. footcandle
• c. lux
• d. lumens

341. Refers to the possible cause of an abrupt frequency variations in a self-excited transmitter oscillator circuit resulting to a poor frequency stability to hold a constant oscillator.

• a. poor soldered connections
• b. heating of capacitor in the oscillator
• c. DC and AC heating of resistors which cause change in values
• d. Aging which cause change in condition in parts characteristics

342. It is the difference in intensity between the black parts and white parts of the picture.

• a. brightness
• b. hue
• c. contrast
• d. illumination

343. The stereophonic subcarrier suppression level in the Philippines standards

• a. less than 4% modulation of the main carrier
• b. less than 3% modulation of the main carrier
• c. less than 2% modulation of the main carrier
• d. less than 1% modulation of the main carrier

344. The sound IF in a TV receiver is

• a. 4.5 MHz
• b. 10.7 MHz
• c. 41.25 MHz
• d. 45.75 MHz

345. The circuit the separates sync pulse from the composite video waveforms is

• a. the keyed AGC amplifier
• b. a clipper
• c. an integrator
• d. a differentiator

346. In the CED system, the disk capacitance varies with the

• a. pit depth
• b. disk size
• c. speed of rotation
• d. wavelength of the scanning light

347. The final power amplifier in an FM transmitter usually operates class ______.

• a. AB
• b. C
• c. B
• d. A

348. In a picture tube, it is the total angle that the beam can be deflected without touching the sides of the envelope.

• a. screen angle
• b. tube angle
• c. picture angle
• d. deflection angle

349. It is necessary to time the scanning with respect to picture information

• a. flyback
• b. synchronization
• c. blanking
• d. scanning

350. The intermediate frequency used in for FM broadcasting Philippine standards.

• a. 455 kHz
• b. 10.7 MHz
• c. 11.4 MHz
• d. 12.5 MHz

Complete List of MCQs in Communications Engineering per topic

Series of Multiple Choice Questions in Electronics Systems and Technologies

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