Question 11 : In CDMA the incoming signal is _____ with the spreading code.
1. Added
2. Multiplied
3. XOR-ed
4. None of the mentioned
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Question 12 : The transmitter of frequency hopping system is fed with encoding scheme such as
1. Frequency shift keying
2. Binary phase shift keying
3. Frequency & Binary phase shift keying
4. None of the mentioned
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Question 13 : In which method cipher feedback is used?
1. Synchronous encryption method
2. Self synchronous encryption method
3. All of the mentioned
4. None of the mentioned
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Question 14 : Spread spectrum can be used to transmit
1. Analog data
2. Digital data
3. Analog & Digital data
4. None of the mentioned
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Question 15 : Which serves the hard hand-off process?
1. Base station
2. Mobile switching center
3. Mobile
4. None of the mentioned
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Question 16 : The segment of the key-stream of plaintext is obtained by _____ of two sequences together.
1. ANDing
2. ORing
3. Addition
4. Modulo 2 addition
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Question 17 : Which are called as substitution encryption techniques?
1. Caesar cipher
2. Trithemius cipher
3. Caesar & Trithemius cipher
4. None of the mentioned
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Question 18 : Which technique is dimension limited?
1. TDMA
2. FDMA
3. TDMA & FDMA
4. None of the mentioned
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Question 19 : How many correlators are used for despreading and code tracking function?
1. One
2. Two
3. Three
4. None of the mentioned
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Question 20 : Which technique is interference limited?
1. TDMA
2. CDMA
3. AMPS
4. None of the mentioned
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