You dont have javascript enabled! Please enable it! MCQ in Broadcasting and Cable TV System Part 4 | ECE Board Exam

# MCQ in Broadcasting and Cable TV System Part 4 | ECE Board Exam

This is the Multiples Choice Questions Part 4 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 4 of the Series

151. In the sawtooth waveform for linear scanning the

a. Linear rise is for flyback

b. Complete cycle includes trace and retrace

c. Sharp reversal in amplitude produces trace

d. Beam moves faster during trace than retrace

Solution:

152. With vertical retrace time of 635 us, the number of complete horizontal lines scanned during vertical flyback is

a. 10

b. 20

c. 30

d. 63

Solution:

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

a. Linear scanning

b. Linear pairing

c. Fishtailing

d. Exact interlacing

Solution:

154. In facsimile transmission, if the drum diameter is 60 mm and scanning pitch is 0.1 mm, calculate the index of cooperation using IEEE recommendation.

a. 1885

b. 600

c. 1900

d. 984

Solution:

155. In the interlaced frame, alternate lines are skipped during vertical scanning because the

a. Trace is slower than retrace

b. Vertical scanning frequency is doubled from the 30-Hz frame rate to the 60-Hz field rate

c. Horizontal scanning is slower than vertical scanning

d. Frame has the aspect ratio of 4:3

Solution:

156. With ten percent for horizontal flyback, this time equals

a. 10 us

b. 5 us

c. 6.4 us

d. 83 us

Solution:

157. Which of the following is not true?

a. Line pairing indicates poor interlacing

b. People will look tall and thin on square raster on the picture tube screen

c. A person can appear to have one shoulder wider than the other because of nonlinear horizontal scanning

d. The keystone effect produces a square raster

Solution:

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

a. 6 half lines or 3 lines

b. Three half lines

c. Five lines

d. Five half lines

Solution:

159. Sawtooth generator circuits produce scanning raster, but the sync pulse are needed for

a. Linearity

b. Timing

c. Keystoning

d. Line pairing

Solution:

160. Which of the following frequencies is wrong?

a. 15, 750 90 Hz for horizontal sync and scanning

b. 60 Hz for vertical sync and scanning

c. 31, 500 Hz for equalizing pulses and serrations in the vertical sync pulse

d. 31, 500 Hz for the vertical scanning frequency

Solution:

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

a. Average carrier level

b. Symmetrical envelope of amplitude variations

c. Lower sideband without upper sideband

d. Upper envelope without the lower envelope

Solution:

162. Which of the following statements is true?

a. Negative transmission means the carrier amplitude decrease for black

b. Negative transmission means the carrier amplitude decreases for white

c. Vestigial sideband transmission means both upper and lower sidebands are transmitted for all modulating frequencies

d. Vestigial sideband transmission means the modulated picture carrier signal has only the upper envelope

Solution:

163. With 2 MHz video signal modulating the picture carrier for channel \$ (66 to 72 MHz), which of the following is transmitted?

a. 66- MHZ carrier and 68-MHz upper side frequency

b. 71.75 MHz carrier, with 69- and 73- MHz carrier

c. 67.25-MHz carrier, with 65.25- and 69.25- MHz side frequencies

d. 67.25 MHz carrier and 69.25 MHz upper side frequency

Solution:

164. With 0.5 MHz video signal modulating the picture carrier,

a. Both upper and lower side frequencies are transmitted

b. Only the upper side frequency is transmitted

c. Only the lower side frequency is transmitted

d. No side frequency are transmitted

Solution:

165. In all standard television broadcast channels he difference between picture and sound carrier frequencies is

a. 0.25 MHz

b. 1.25 MHz

c. 4.5 MHz

d. 6 MHz

Solution:

166. The difference between sound carrier frequencies in two adjacent channels equals

a. 0,25 MHz

b. 1.25 MHz

c. 4.5 MHz

d. 6 MHz

Solution:

167. With 7% black setup, maximum black in picture corresponds to what percent amplitude in the modulated carrier signal?

a. 5

b. 68

c. 75

d. 95

Solution:

168. Line-of-sight transmission is a characteristic of propagation for the

a. VHF and UHF bands

b. VHF bands but not the UHF band

c. Low radio frequencies below a MHz

d. AM picture signal but not the FM sound signal

Solution:

169. In channel 14, 3.58 MHz color signal is transmitted at the frequency of

a. 471.25 MHz

b. 473.25 MHz

c. 474.83 MHz

d. 475. 25 MHz

Solution:

170. The difference between the sound carrier and color subcarrier frequencies is

a. 4.5 MHz

b. 1.25 MHz

c. 0.92 MHz

d. 0.25 MHz

Solution:

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

a. I

b. Q

c. Y

d. R-Y

Solution:

172. The hue 1800 out of phase with red is

a. Cyan

b. Yellow

c. Green

d. Blue

Solution:

173. Greater peak-to-peak amplitude of the 3.58-MHz chrominance signal indicates more

a. White

b. Yellow

c. Hue

d. Saturation

Solution:

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

a. 4.5- MHz intercarrier sound

b. Picture carrier

Solution:

175. The hue of color sync phase is

a. Red

b. Cyan

c. Blue

d. Yellow-green

Solution:

176. Which signal has color information for 1.5 MHz bandwidth?

a. I

b. Y

c. R – Y

d. B โ Y

Solution:

177. Which of the following is false?

a. I video hues are orange or cyan

b. The transmitter matrix output includes Y, I and Q video

c. A three-gun picture tube can serve as a matrix

d. A full saturated color is mostly white

Solution:

178. The color with the most luminance is

a. Red

b. Yellow

c. Green

d. Blue

Solution:

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

a. Yellow

b. Cyan

c. Blue

d. Orange

Solution:

180. 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:

181. The IF value for the color in receivers, for any station, is

a. 0.5 MHz

b. 1.5 MHz

c. 3.58 MHz

d. 4.5 MHz

Solution:

182. If the 3.58 MHz C amplifier in the receiver does not operate, the result will be

a. No color

b. No red

c. Too much blue

d. Too much yellow

Solution:

183. Which of the following is not tuned to 3.58 MHz?

a. Burst amplifier

b. Video preamplifier

c. Chroma amplifier

d. Color demodulator input

Solution:

184. When B โ Y and Y signal are combined, the result is

a. Blue video

b. 3.58 MHz chroma

c. Red video

d. Green video

Solution:

185. The phase angle between B โ Y and R โ Y is

a. 180ยฐ

b. 57ยฐ

c. 0ยฐ

d. 90ยฐ

Solution:

186. Which of the following applies for a monochrome program?

a. Chroma amplifier on

b. Y video amplifier off

c. Color killer on

d. Picture tube off

Solution:

187. The manual color control is generally in which circuit?

a. Red video output

b. Y video output

c. Chroma bandpass amplifier

d. R โ Y demodulator

Solution:

188. The contrast control is generally in which circuit

a. Red video output

b. Y video output

c. Chroma bandpass amplifier

d. R โ Y demodulator

Solution:

189. If the color oscillator does not operate, the result will be

a. No picture

b. No color

c. Incorrect hues

d. No color sync

Solution:

190. The hue of the color sync burst phase is

a. Red

b. Blue

c. Magenta

d. Yellow-green

Solution:

191. The balance for Y video signals to the three guns in the picture tube is set by the

a. Drive controls

b. Contrast control

c. Screen control

d. Color control

Solution:

192. The voltage wave shape in the output of the vertical amplifier is a

a. Trapezoid

b. Sawtooth

c. Rectangle

d. Square

Solution:

193. An auto transformer in the vertical output circuit

a. Steps up voltage for the scanning coils

b. Isolates the scanning coils for B+ voltage in the primary

c. Isolates the oscillator and output stages

d. Does not isolate the secondary from dc voltage in the primary

Solution:

194. Vertical flyback pulses at the plate of the vertical output tube are for retrace blanking at the picture tube

a. Cathode

b. Control grid

c. Screen grid

d. Anode

Solution:

195. The top of the picture is stretched with too much height. To correct this

a. Vary the vertical hold control

b. Reduce height with the vertical linearity control

c. Increase height with the size control

d. Replace the vertical oscillator tube

Solution:

196. Peak-to-peak sawtooth scanning current in the vertical coils can be

a. 0.7 mA

b. 0.7 A

c. 50 A

d. 150 uA

Solution:

197. A push-pull amplifier in the vertical output circuit

a. Usually operates class C

b. Can use PNP and NPN transistor

c. Cannot be used

d. Generally uses two beam-power pentodes

Solution:

198. Which stage is not necessary for producing horizontal output?

a. Horizontal oscillator

b. Horizontal amplifier

c. Damper

d. Horizontal AFC

Solution:

199. The frequency of the sawtooth current in the horizontal amplifier is

a. 60 Hz

b. 10500 Hz

c. 15750 Hz

d. 70 kHz

Solution:

200. When the horizontal amplifier is conducting peak plate current, the electron scanning beam is at the

a. Left edge of the raster

b. Right edge of the raster

c. Center of trace

d. Center of flyback

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

P inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. Also provides professionals with materials for their lectures and practice exams. Help me go forward with the same spirit.

โWill you subscribe today via YOUTUBE?โ

Subscribe

• Full Content Access Exclusive to Premium members

## PINOYBIX FREEBIES FOR PREMIUM MEMBERSHIP:

• CIVIL ENGINEERING REVIEWER
• CIVIL SERVICE EXAM REVIEWER
• CRIMINOLOGY REVIEWER
• ELECTRONICS ENGINEERING REVIEWER (ECE/ECT)
• ELECTRICAL ENGINEERING & RME REVIEWER
• FIRE OFFICER EXAMINATION REVIEWER
• LET REVIEWER
• MASTER PLUMBER REVIEWER
• MECHANICAL ENGINEERING REVIEWER
• NAPOLCOM REVIEWER

## FOR A LIMITED TIME

If you subscribe for PREMIUM today!