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MCQ in Wire and Wireless Communications System Part 4 – Answers

MCQ in Wire and Wireless Communications System Part 4 | ECE Board Exam

Below are the answers key for the Multiple Choice Questions in Wire and Wireless Communications System Part 4.

151. Bell

152. A flow of loop current

153. 5

154. Tandem

155. All of the above

156. 0 to 4000 Hz

157. Multiplexing

158. Uses a separate channel for signaling only

159. Any of the above

160. All of the above

161.Digital transmission

162. Carbon

163. Varistor

164. Electromagnetic

165. Induction coil

166. 7

167. All of the above

168. Prevents dial pulsing from ringing the bell

169. All of the above

170. Line relays in the central office will not mistake it for off-hook current

171. Needed because of transients from dial pulsing, lightning, induction or short circuit

172. the voltage drop across conventional bridges leaves too little voltage to operate the set

173. B and C above

174. Allow automatic redialing of the last number dialed

175. Protect the set against polarity reversals on the line

176. A high voltage transient is generated

177. 10 pulses per second

178. 16

179. Smaller size

180. All of the above

181. Digital multiplier circuit

182. Visual display

183. Zener diodes

184. Half-duplex mode

185. Pulse amplitude modulation

186. Linear

187. Higher level systems

188. Dedicated

189. Mostly for data transmission

190. The presence of spurious frequencies caused by having too high frequencies in the sampled signal

191. Synchronous

192. Bipolar

193. The telephone network will not pass direct current

194. Asynchronous transmission

195. At both ends

196. All of the above

197. Phase distortion

198. All of the above

199. Reduce costs

200. 7

Questions and Answers in Wire and Wireless Communications System Series

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

MCQ in Wire and Wireless Communications
PART 1: MCQ from Number 1 – 50                                 Answer key: PART 1
PART 2: MCQ from Number 51 – 100                            Answer key: PART 2
PART 3: MCQ from Number 101 – 150                          Answer key: PART 3
PART 4: MCQ from Number 151 – 200                          Answer key: PART 4
PART 5: MCQ from Number 201 – 250                          Answer key: PART 5
PART 6: MCQ from Number 251 – 300                          Answer key: PART 6
PART 7: MCQ from Number 301 – 350                          Answer key: PART 7
PART 8: MCQ from Number 351 – 400                          Answer key: PART 8
PART 9: MCQ from Number 401 – 450                          Answer key: PART 9
PART 10: MCQ from Number 451 – 500                        Answer key: PART 10

Complete List of MCQ in Communications Engineering per topic

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