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WorksheetsTEST 1
Total questions: 100
Worksheet time: 2hrs 40mins
Name
Class
Date
1.
GSM has 124 carriers and 8 time slots each. Find total voice channels.
a)
992
b)
1024
c)
248
d)
124
2.
FDMA system has 12 MHz bandwidth. Each channel uses 30 kHz. Channels?
a)
300
b)
350
c)
400
d)
450
3.
CDMA chip rate = 3.84 Mcps, data rate = 9.6 kbps. Processing gain?
a)
200
b)
300
c)
400
d)
500
4.
Total channels = 420, cluster size = 7. Channels per cell?
a)
50
b)
55
c)
60
d)
70
5.
Cell radius doubled. Assuming circular cells, area increases by factor?
a)
2
b)
3
c)
4
d)
6
6.
GSM slot gives 14.4 kbps. User gets 3 slots. Data rate?
a)
28.8
b)
43.2
c)
57.6
d)
72
7.
Reuse distance formula D = √(3N)R. If N = 4, find D/R.
a)
2.4
b)
3.5
c)
4.6
d)
5.2
8.
Total spectrum = 25 MHz, carrier spacing = 200 kHz. Carriers?
a)
100
b)
124
c)
150
d)
200
9.
Cell supports 100 channels, traffic = 75 Erlangs. Utilization?
a)
0.65
b)
0.7
c)
0.75
d)
0.8
10.
GSM frame duration = 4.615 ms. Frames per second?
a)
187
b)
200
c)
217
d)
250
11.
If reuse factor = 1/7, cluster size is
a)
4
b)
6
c)
7
d)
9
12.
Cell splitting halves radius. Capacity increases by factor?
a)
2
b)
3
c)
4
d)
6
13.
TDMA channel divided into 8 slots. One carrier supports how many users?
a)
4
b)
6
c)
8
d)
10
14.
GSM allocates 5 slots, each 9.6 kbps. Total data rate?
a)
38.4
b)
48
c)
57.6
d)
64
15.
Total channels = 300, cluster size = 3. Channels per cell?
a)
50
b)
75
c)
100
d)
150
16.
CDMA system bandwidth = 5 MHz, data rate = 10 kbps. PG?
a)
200
b)
300
c)
400
d)
500
17.
If cell radius reduces to 1/3, capacity increases by factor?
a)
3
b)
6
c)
9
d)
12
18.
Offered traffic = 120 Erlangs, channels = 150. Utilization?
a)
0.6
b)
0.7
c)
0.8
d)
0.9
19.
GSM uses 8 slots. If 2 are control slots, traffic slots?
a)
4
b)
5
c)
6
d)
8
20.
If total BW = 20 MHz and channel BW = 50 kHz, channels?
a)
200
b)
300
c)
400
d)
500
21.
CDMA chip rate 1.2288 Mcps, data rate 9.6 kbps. PG?
a)
64
b)
96
c)
128
d)
256
22.
Total carriers = 100, slots per carrier = 8. Voice channels?
a)
600
b)
700
c)
800
d)
900
23.
Cluster size increases from 4 to 7. Capacity per cell
a)
Increases
b)
Decreases
c)
Same
d)
Doubles
24.
If call duration increases, Erlang traffic
a)
Decreases
b)
Same
c)
Increases
d)
Zero
25.
GSM carrier spacing = 200 kHz. 10 MHz spectrum supports carriers?
a)
40
b)
50
c)
60
d)
70
26.
A cell radius is 2 km. Find reuse distance for N=7 (approx).
a)
6 km
b)
9 km
c)
12 km
d)
15 km
27.
Total time slots = 64. Each user needs 2 slots. Users supported?
a)
16
b)
24
c)
32
d)
48
28.
If bandwidth doubles in FDMA, channels
a)
Same
b)
Halve
c)
Double
d)
Quadruple
29.
Data rate per slot = 16 kbps. 6 slots assigned. Rate?
a)
64
b)
80
c)
96
d)
112
30.
Cell supports 90 calls, each 2 minutes. Traffic in Erlangs?
a)
2
b)
3
c)
4
d)
5
31.
Total BW = 15 MHz, channel BW = 25 kHz. Channels?
a)
400
b)
500
c)
600
d)
700
32.
If reuse factor is 1/4, cluster size is
a)
3
b)
4
c)
6
d)
7
33.
Chip rate = 5 Mcps, data rate = 20 kbps. PG?
a)
125
b)
200
c)
250
d)
300
34.
Cell area is 10 km². After splitting into 4 cells, area per cell?
a)
2
b)
2.5
c)
4
d)
5
35.
GSM allocates 6 slots of 14.4 kbps. Rate?
a)
72
b)
86.4
c)
96
d)
100
36.
Total users = 120, channels = 100. Blocking probability
a)
Zero
b)
Low
c)
High
d)
Same
37.
If channel bandwidth halves, FDMA channels
a)
Same
b)
Double
c)
Halve
d)
Zero
38.
A cell handles 80 Erlangs with 100 channels. Utilization?
a)
0.6
b)
0.7
c)
0.8
d)
0.9
39.
GSM carrier count = 80, slots per carrier = 8. Calls supported?
a)
320
b)
480
c)
640
d)
800
40.
Reuse distance ratio D/R for N=3 is approx
a)
2.4
b)
3
c)
3.5
d)
4.6
41.
If cell count doubles, total capacity
a)
Same
b)
Halves
c)
Doubles
d)
Quadruples
42.
Offered traffic = 60 Erlangs, channels = 80. Utilization?
a)
0.6
b)
0.65
c)
0.75
d)
0.8
43.
GSM uses 200 kHz spacing. 16 MHz spectrum supports carriers?
a)
60
b)
70
c)
80
d)
90
44.
CDMA bandwidth = 1.25 MHz, data rate = 9.6 kbps. PG?
a)
64
b)
96
c)
128
d)
256
45.
If user speed doubles, handoff rate
a)
Same
b)
Halves
c)
Doubles
d)
Zero
46.
Cell radius reduced to 1/2. Number of cells in same area?
a)
2
b)
3
c)
4
d)
6
47.
TDMA frame has 10 ms duration. Frames per second?
a)
50
b)
100
c)
200
d)
500
48.
GSM slot rate = 9.6 kbps. 8 slots assigned. Rate?
a)
57.6
b)
64
c)
76.8
d)
80
49.
Total channels = 560, cluster size = 7. Channels per cell?
a)
60
b)
70
c)
80
d)
90
50.
If interference increases, CDMA capacity
a)
Increases
b)
Same
c)
Decreases
d)
Doubles
51.
A GSM system uses 200 kHz spacing. Each carrier has 8 slots. Operator owns 104 carriers. All slots carry voice. Find total voice channels.
a)
832
b)
896
c)
720
d)
1040
52.
An FDMA system has 24 MHz total bandwidth. Each channel needs 50 kHz. Ignore guard bands. Calculate number of channels supported.
a)
420
b)
460
c)
480
d)
520
53.
A CDMA system uses a chip rate of 4.096 Mcps. User data rate is 16 kbps. Find the processing gain.
a)
192
b)
224
c)
256
d)
320
54.
Total system channels are 840. Cluster size is 7. Channels are equally distributed. Determine channels per cell.
a)
110
b)
120
c)
130
d)
140
55.
A cell radius is increased by 2 times. Assume circular cells. Determine how much the area increases.
a)
2 times
b)
3 times
c)
4 times
d)
6 times
56.
A GSM user is allocated 6 time slots. Each slot supports 9.6 kbps. Ignore overhead. Calculate total data rate.
a)
48
b)
52.8
c)
57.6
d)
64
57.
Reuse distance is given by D = √(3N)R. If N = 9, find the ratio D/R.
a)
4.2
b)
5.2
c)
6
d)
7.1
58.
Total spectrum is 28 MHz. GSM carrier spacing is 200 kHz. Determine number of carriers available.
a)
124
b)
130
c)
140
d)
150
59.
A cell supports 160 channels. Offered traffic is 112 Erlangs. Calculate channel utilization.
a)
0.6
b)
0.65
c)
0.7
d)
0.75
60.
GSM frame duration is 4.615 ms. A call lasts 2.5 seconds. Find number of frames used.
a)
480
b)
520
c)
542
d)
600
61.
Cluster size is increased from 4 to 8. Assume same total channels. What happens to channels per cell?
a)
Same
b)
Doubles
c)
Halves
d)
Quadruples
62.
An FDMA system doubles total bandwidth. Channel bandwidth is unchanged. What happens to number of channels?
a)
Same
b)
Doubles
c)
Halves
d)
Quadruples
63.
CDMA bandwidth is 5 MHz. Data rate is 25 kbps. Calculate processing gain.
a)
150
b)
180
c)
200
d)
250
64.
Total channels = 600. Cluster size = 12. Channels are equally shared. Find channels per cell.
a)
40
b)
45
c)
50
d)
55
65.
Cell radius is reduced to one-third. Assume uniform traffic density. Find capacity increase factor.
a)
3
b)
6
c)
9
d)
12
66.
GSM assigns 4 slots of 14.4 kbps to a user. Compute achievable data rate.
a)
43.2
b)
50
c)
57.6
d)
64
67.
A cell carries 90 Erlangs traffic using 120 channels. Determine utilization percentage.
a)
0.65
b)
0.7
c)
0.75
d)
0.8
68.
Total spectrum is 16 MHz. Channel bandwidth is 25 kHz. Calculate number of FDMA channels.
a)
520
b)
600
c)
640
d)
700
69.
CDMA chip rate is 1.92 Mcps. Data rate is 12 kbps. Find processing gain.
a)
128
b)
144
c)
160
d)
192
70.
GSM carrier count is 90. Each has 8 time slots. All slots used for calls. Find total calls supported.
a)
640
b)
720
c)
760
d)
800
71.
A cell radius is 1.5 km. Cluster size is 7. Find reuse distance approximately.
a)
5 km
b)
6 km
c)
7 km
d)
8 km
72.
Offered traffic is 150 Erlangs. Number of channels is 200. Find utilization.
a)
0.65
b)
0.7
c)
0.75
d)
0.8
73.
GSM frame duration is 4.615 ms. How many frames occur in 5 seconds?
a)
900
b)
950
c)
1083
d)
1200
74.
If cell area is split into 4 equal cells, how does capacity change?
a)
Same
b)
Doubles
c)
Quadruples
d)
Halves
75.
FDMA channel width halves while total bandwidth stays same. Channels will
a)
Same
b)
Double
c)
Halve
d)
Quadruple
76.
CDMA bandwidth is 10 MHz. User rate is 20 kbps. Find processing gain.
a)
400
b)
450
c)
500
d)
550
77.
Total channels = 1000. Cluster size = 10. Channels per cell?
a)
80
b)
90
c)
100
d)
110
78.
GSM user is assigned 7 slots of 9.6 kbps. Calculate data rate.
a)
57.6
b)
67.2
c)
72
d)
76.8
79.
A cell handles 70 Erlangs traffic using 100 channels. Utilization equals
a)
0.6
b)
0.65
c)
0.7
d)
0.75
80.
GSM spectrum is 18 MHz. Carrier spacing is 200 kHz. Find number of carriers.
a)
80
b)
90
c)
100
d)
110
81.
Reuse factor is 1/12. Find corresponding cluster size.
a)
7
b)
9
c)
12
d)
16
82.
If number of cells doubles in same area, total capacity will
a)
Same
b)
Halve
c)
Double
d)
Quadruple
83.
CDMA chip rate 3.072 Mcps, data rate 24 kbps. Processing gain?
a)
96
b)
128
c)
160
d)
192
84.
A cell supports 180 channels and carries 135 Erlangs. Utilization?
a)
0.65
b)
0.7
c)
0.75
d)
0.8
85.
GSM assigns 3 slots of 14.4 kbps. Compute total rate.
a)
28.8
b)
36
c)
43.2
d)
57.6
86.
FDMA total BW = 30 MHz. Channel BW = 60 kHz. Channels supported?
a)
400
b)
450
c)
500
d)
550
87.
If cell radius is doubled, number of cells covering same area will
a)
Same
b)
Halve
c)
Quarter
d)
Double
88.
CDMA bandwidth = 2 MHz. Data rate = 8 kbps. Processing gain?
a)
200
b)
220
c)
250
d)
300
89.
GSM has 88 carriers with 8 slots each. Find total voice channels.
a)
640
b)
704
c)
720
d)
768
90.
Offered traffic is 40 Erlangs using 50 channels. Utilization equals
a)
0.6
b)
0.7
c)
0.8
d)
0.9
91.
If cluster size reduces from 9 to 3, capacity per cell will
a)
Decrease
b)
Same
c)
Triple
d)
Double
92.
GSM slot rate is 16 kbps. User gets 5 slots. Find data rate.
a)
64
b)
72
c)
80
d)
96
93.
FDMA has 20 MHz bandwidth. Channel width 40 kHz. Channels?
a)
400
b)
450
c)
500
d)
550
94.
CDMA chip rate = 6.144 Mcps, data rate = 24 kbps. PG?
a)
200
b)
220
c)
256
d)
300
95.
A cell area is 12 km². After splitting into 6 equal cells, area per cell?
a)
1
b)
2
c)
3
d)
4
96.
GSM user allocated 8 slots of 9.6 kbps. Data rate equals
a)
57.6
b)
64
c)
72
d)
76.8
97.
If interference increases in CDMA, system capacity will
a)
Increase
b)
Remain same
c)
Decrease
d)
Double
98.
Total channels = 720. Cluster size = 6. Channels per cell?
a)
100
b)
110
c)
120
d)
130
99.
A call lasts 180 seconds. GSM frame duration is 4.615 ms. Frames used?
a)
36000
b)
38000
c)
39000
d)
42000
100.
If channel bandwidth doubles while spectrum fixed, FDMA channels will
a)
Same
b)
Double
c)
Halve
d)
Quadruple
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