Chapter 3 - 11th - Data Communications Multiple Questions and Answers.




56.In Asynchronous transmission; mark state is represented by choose which one is correct?
A. 2
B. 1
C. 0
D. 50

57.Which one is not unguided media?
A. Satellite
B. Microwave
C. Mobile communication
D. Fiber optical cable

58.communication medium requires “line-of-sight” choose which one is correct?
A. Microwave
B. Fiber optic cable
C. Twisted pair
D. Coaxial cable

59.In microwave transmission system, antennas are placed on a high towers or buildings and these are placed within choose which one is correct?
A. 200 to 300 miles of each other
B. 2 to 3 miles of each other
C. 20 to 30 miles of each other
D. 100 to 200 miles of each other

60.Satellites are approximately miles above the earth choose which one is correct?
A. 300 miles
B. 22,000 miles
C. 23300 miles
D. 22300 miles

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