Packet Radio

Wireless & Mobile Communications

This set of Wireless & Mobile Communications Multiple Choice Questions & Answers (MCQs) focuses on “Packet Radio”.

1. In ___________ technique, many subscribers attempt to access a single channel in an uncoordinated manner.
a) Packet radio
b) Multiple access
c) Modulation
d) Spread spectrum

2. Packet radio uses _________ and __________ signals for perfect feedback.
a) Forward, reverse
c) Active, passive
d) Linear, non linear

3. Packet radio has high spectral efficiency.
a) True
b) False

4. ___________ is defined as average number of messages successfully transmitted per unit time in packet radio multiple access technique.
a) Average delay
b) Figure of merit
c) Throughput
d) Efficiency

5. What is the time period during which the packets are susceptible to collisions with transmissions from other users?
a) Delay time
b) Latency period
c) Average delay time
d) Vulnerable period

6. For a PR multiple access technique, packet transmissions occur with __________ distribution.
a) Poisson
b) Gaussian
c) Pearson
d) Rayleigh

7. If λ is mean arrival rate and τ is the packet duration, then traffic occupancy of a packet radio network is equal to _________
a) λτ
b) λ/τ
c) λ-τ
d) λτ2

8. Pure ALOHA is __________
a) Modulation technique
b) Multiple access technique
c) Random access technique
d) Spread spectrum technique

9. For pure ALOHA protocol, the vulnerable period is ___________ the packet duration.
a) Double
b) Equal
c) Ten times
d) Not equal

10. The vulnerable period of slotted ALOHA is _________ packet duration.
a) Two
b) Ten
c) One
d) Three

11. In slotted ALOHA, time is divided into different length of time slots.
a) True
b) False

12. CSMA stands for _________
a) Carrier sense multiple access
b) Code sense multiple access
c) Carrier sense modulation access
d) Carry sense multiple access

13. __________ is the time required for a terminal to sense whether or not the channel is idle.
a) Propagation delay
b) Average delay
c) Detection delay
d) Time delay

14. Which of the following is based on time division multiplexing?
a) Slotted ALOHA
b) Pure ALOHA
d) Reservation ALOHA

15. Discrete packet time technique, PRMA stands for _________
a) Packet reservation multiple access
b) Photo reflector multiple access
c) Proton reflector modulating access
d) Packet reflection multiple access

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