RRB JE EC: Communication System Quiz 1

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Question 1

Which of the following regarding cellular systems with small cells are correct?
1) Higher capacity and robustness
2) Needless transmission power and have to deal with local interference only
3) Frequency planning and infrastructure needed
4) These require both circuit switching and packet switching
Select the correct answer using the code given below

• A1, 2 and 4
• B1, 3 and 4
• C1, 2 and 3
• D2, 3 and 4

Question 2

Why neighbouring cells in mobile communication assigned with different frequencies?

• ATo minimize area
• BTo maximize capacity
• CTo maximize Throughput
• DTo minimize interference.

Question 3

If M is number of parallel channels/base station, Bs is total bandwidth for cellular net with occupied bandwidth/channel as BT, then Bs = M C BT where there are 8 channels per cell C as cluster size. Expression for spectrum efficiency of cellular net will be:

• AS_E = 1+Ac / B_T C M S_u
• BS_E = Ac / B_T C S_u
• CS_E = Ac / B_T C M S_u
• DS_E = Ac / B_T C

Question 4

In a cellular network, which among the following represents 1, 2 and 4?

• AMobile phone
• BPublic Switched Telephone Network
• CMobile Switching Centre(MSC)
• DNone of above

Question 5

CDMA is used as 2.5 G mobile communication which uses

• Aspread spectrum
• BTDMA
• CFDMA
• DNone

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