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Free download in PDF Wireless Communication Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
41
Global Positioning System uses
[A]
CDMA
[B]
TDMA
[C]
SDMA
[D]
FDMA
42
The guard interval is provided in OFDM
[A]
To eliminate the need of pulse shaping filter
[B]
To eliminate ISI
[C]
High symbol rate
[D]
Both a and b
43
Packet radio refers to
[A]
Multiple users on single channel
[B]
Single user on multiple channels as per demand
[C]
Multiple users on multiple channels at different time slots
[D]
All of the above
Answer: Multiple users on single channel
44
Disadvantages of packet radio are
[A]
Induced delays
[B]
Low spectral efficiency
[C]
Large spectrum required
[D]
Both a and b
45
Pure ALOHA is a
[A]
Hybrid access protocol
[B]
Demand access protocol
[C]
Scheduled access protocol
[D]
Random access protocol
Answer: Random access protocol
46
The increase in number of users in PURE ALOHA causes
[A]
Increase in delay
[B]
Increase in probability of collision
[C]
Increase in spectrum
[D]
Both a and b
47
SDMA technique employs
[A]
Smart antenna technology
[B]
Use of spatial locations of mobile units within the cell
[C]
More battery consumption
[D]
Both a and b are correct
Answer: Both a and b are correct
48
The increased capacity of SDMA is due to
[A]
Focused signal transmitted into narrow transmission beams
[B]
Smart antennas pointing towards mobile stations
[C]
Use of different frequencies at same time slot
[D]
Both a and b are correct
Answer: Both a and b are correct
49
———– introduced Frequency Modulation for mobile communication systems in 1935.
[A]
Edwin Armstrong
[B]
Albert Einstein
[C]
Galileo Galilei
[D]
David Bohm
50
Paging systems were based on
[A]
Simplex systems
[B]
Half duplex systems
[C]
Full duplex systems
[D]
None of the above
51
2G CDMA standard – cdma one supports up to
[A]
8 users
[B]
64 users
[C]
32 users
[D]
116 users
52
3G W-CDMA is also known as
[A]
UMTS
[B]
DECT
[C]
DCS-1800
[D]
ETACS
53
The minimum spectrum allocation required for W-CDMA is
[A]
5MHz
[B]
2MHz
[C]
500KHz
[D]
100KHz
54
Spectrum Efficiency of a cellular network is
[A]
The traffic carried by whole network
[B]
The traffic carried per cell divided by the bandwidth of the system and the area of a cell
[C]
Expressed in Erlang /MHz /km2
[D]
Both b and c
55
In Handoff
[A]
Process of transferring the call to the new base station
[B]
Transfers the call
[C]
New channel allocation is done
[D]
All of the above
56
Inter system Handoffs are done
[A]
When mobile station moves in two cellular systems with different MSC
[B]
When mobile station moves between two cellular systems
[C]
When mobile station receives more power from other base station than the serving base station
[D]
All of the above
57
Dwell time is the time for
[A]
A call within the cell
[B]
Hand off
[C]
Waiting for channel allocation
[D]
None of the above
Answer: A call within the cell
58
Dwell time depends upon
[A]
Interference
[B]
Distance between the subscriber and the base station
[C]
Propagation of call
[D]
All of the above
59
GSM is an example of
[A]
TDMA cellular systems
[B]
FDMA cellular systems
[C]
CDMA cellular systems
[D]
All of the above
Answer: TDMA cellular systems
60
In Mobile Assisted Handoff (MAHO), the handoff takes place when
[A]
The power received by the mobile station from other base station is more than the serving base station
[B]
The channel allocated is not available
[C]
The mobile station has no signal
[D]
All of the above
Answer: The power received by the mobile station from other base station is more than the serving base station