Evolution of Mobile Radio Communication

Evolution of Mobile Radio Communication

Q1. The modulation technique used for mobile communication systems during world war II was

a. Amplitude modulation
b. Frequency modulation
c. ASK
d. FSK

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Q2. ----------- introduced Frequency Modulation for mobile communication systems in 1935.

a. Edwin Armstrong
b. Albert Einstein
c. Galileo Galilei
d. David Bohm

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Q3. The early FM push-to-talk telephone systems were used in

a. Simplex mode
b. Half duplex mode
c. Full duplex mode
d. None of the above

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Q4. DECT stands for

a. Digital European Cellular Telex
b. Digitized Emergency Cellular Telephone
c. Digital European Cordless Telephone
d. Digital European Cellular Telephone

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Q5. World's first cellular system was developed by

a. Nippon Telephone and Telegraph (NTT)
b. Bellcore and Motorola
c. AT&T Bell Laboratories
d. Qualcomm

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