21. A decrease in magnitude of current, voltage, a power of a signal in transmission between points, is known as
A. Attenuation
B. Amplitude
C. Aloha
D. Carrier
E. None of the above
22. The term “remote job entry” relates to
A. batch processing
B. realtime processing
C. transaction processing
D. distributed processing
E. None of the above
23. Which of the following performs modulation and demodulation?
A. fiber optic
B. satellite
C. coaxial cable
D. modem
E. None of the above
24. Data communications monitors available on the software market include
A. ENVIRON/1
B. TOTAL
C. BPL
D. Telenet
E. None of the above
25. Which of the following statement is correct?
A. A spin stabilized satellite used solar cells mounted on a cylinder body that continuously rotates so that 40 a time and it also uses gyroscopic action of a spinning satellite to maintain its orientation towards the earth and the sun.
B. A spin stabilized satellite uses solar panels whose cells are continually oriented toward the sun
C. Satellite transponders use lower frequency reception of radiation from earth stations and higher frequency for transmission to earth stations.
D. satellite transponders use a single frequency for reception and transmission from one point on earth to another
E. None of the above