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1191. Fiber optics possess following properties:

A. Immune electromagnetic interference
B. Very less signal attenuation
C. Very hard to tap
D. All of the mentioned *

1192. If an optical carrier is represented as OC-n, generally the link speed equals (in Mbps).

A. n*39.8
B. n*51.8 *
C. 2n*51.8
D. None of the mentioned

1193. Terrestrial radio channels are broadly classified into _________ groups :

A. 2
B. 3 *
C. 4
D. 1

1194. Radio channels are appealing medium on the grounds that :

A. Can penetrate walls
B. Mobile users can be provided with connectivity.
C. Can carry signals for long distance
D. All of the mentioned *

1195. Geostationary satellites:

A. Are fixedly positioned above the earth *
B. Rotate the earth about a single point.
C. Pivot the earth about a changing hub
D. All of the mentioned

1196. The sharing of a medium and its connection by at least two gadgets is called :

A. Fully duplexing
B. Multiplexing *
C. Both A and B
D. None of the mentioned

1197. Multiplexing is used in ___________

A. Packet switching
B. Circuit switching *
C. Data switching
D. None of the mentioned

1198. Which multiplexing technique transmits digital signals ?

A. FDM
B. TDM *
C. WDM
D. None of the mentioned

1199. TDM links have __________ slots if there are n signal sources with the same data rate:

A. n
B. n/2
C. n*2
D. 2n

1200. The transmission rate of this TDM circuit is as follows if the link transmits 4000 frames per second and each slot contains 8 bits:

A. 32Kbps *
B. 500bps
C. 500kbps
D. None of the mentioned