# Practice Quiz in Wire and Wireless Communications System Part 27

Online Practice Quiz in Wire and Wireless Communications System part 27 as one of the Communications Engineering topic.

This is the Online Practice Quiz in Wire and Wireless Communications System Part 27 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.

### Continue Part XXVII of the Online Practice Quiz

#### Quiz in Wire and Wireless Communications System

Question 261. The wideband designation in Wideband-CDMA (WCDMA) denotes a bandwidth of

A. 2.5 MHz

B. 3 MHz

C. 4.5 MHz

D. 5 MHz

Question 262. LDMS optimizes frequency reuses by optimizing which of the following?

A. Minimizing multipathing

B. Cross polarization

C. Sectoring the distribution system

D. All of these

Question 263. Determine the number of channels per cluster of a cellular telephone area comprised of 10 clusters with seven cells in each cluster and 10 channels in each cell.

A. 70 channels per cluster

B. 700 channels per cluster

C. 7000 channels per cluster

D. 7 channels per cluster

Question 264. Spacing between the simultaneously used transmit and receive frequencies is

A. 45 MHz

B. 30 kHz

C. 12 kHz

D. 200 kHz

Question 265. Which of the following is used to estimate the distance that a subscriber can be located while still achieving acceptable reliability?

A. Call-size selection

C. Capital cost model

D. Cell design

Question 266. When a signal from a mobile cellular unit drops below a certain level, what action occurs?

A. The unit is "handed off" to a closer cell.

B. The call is terminated.

C. The MTSO increases power level.

D. The cell site switches antenna.

Question 267. How often will hand-offs occur when vehicle travels through a CMTS at 100 km per hour speed if the distance between cell sites is 10 km?

A. 6 mins

B. 12 mins

C. 395 sec

D. 10 hrs

Question 268. What modulation technique uses digital modulation technique?

A. BPSK

B. QPSK

C. GFSK

D. GMSK

Question 269. Cellular communication began in

A. 1977

B. 1956

C. 1983

D. 1999

Question 270. A base and mobile is separated by 5 km. What is the propagation time for a signal traveling between them?

A. 14.5 Âµsec

B. 18.9 Âµsec

C. 20.8 Âµsec

D. 16.7 Âµsec