Q.1 The sharing of a medium and its link by two or more devices is called _________.
A. Fully duplexing
B. Multiplexing
C. Micropleixng
D. Duplexing
Ans : Multiplexing
Q.2 Multiplexing is used in _______.
A. Packet switching
B. Circuit switching
C. Data switching
D. Packet & Circuit switching
Ans : Circuit switching
Q.3 Which multiplexing technique used to transmit digital signals?
A. FDM
B. TDM
C. WDM
D. FDM & WDM
Ans : TDM
Q.4 If there are n signal sources of same data rate, then the TDM link has _______ slots.
A. n
B. n/2
C. n*2
D. 2n
Ans : n
Q.5 If link transmits 4000 frames per second, and each slot has 8 bits, the transmission rate of circuit this TDM is _________.
A. 32kbps
B. 500bps
C. 500bps
D. 32bps
Ans : 32kbps
Frame rate = 4000/sec and number of bits in slot = 8
Transmission rate = (4000 * 8) bps
= 32000bps
= 32kbps
Q.6 The state when dedicated signals are idle are called __________.
A. Death period
B. Poison period
C. Silent period
D. Stop period
Ans : Silent period
Q.7 Multiplexing provides _________.
A. Efficiency
B. Privacy
C. Anti jamming
D. Both Efficiency & Privacy
Ans : Both Efficiency & Privacy
Q.8 In TDM, the transmission rate of a multiplexed path is always _______ the sum of the transmission rates of the signal sources.
A. Greater than
B. Lesser than
C. Equal to
D. Equal to or greater than
Ans : Greater than
Q.9 In TDM, slots are further divided into _________.
A. Seconds
B. Frames
C. Packets
D. Bits
Ans : Frames
Q.10 Which of this is not a guided media?
A. Fiber optical cable
B. Coaxial cable
C. Wireless LAN
D. Copper wire
Ans : Wireless LAN
Q.11 UTP is commonly used in __________.
A. DSL
B. FTTP
C. HTTP
D. None of the above
Ans : DSL
Q.12 Coaxial cable consists of _______ concentric copper conductors.
A. 1
B. 2
C. 3
D. 4
Ans : 2
Q.13 Fiber optics posses following properties __________.
A. Immune electromagnetic interference
B. Very less signal attenuation
C. Very hard to tap
D. All of the above
Ans : All of the above
Q.14 If an Optical Carrier is represented as OC-n, generally the link speed equals(in Mbps) __________.
A. n*39.8
B. n*51.8
C. 2n*51.8
D. None of the above
Ans : n*51.8
Q.15 Terrestrial radio channels are broadly classifed into _____ groups.
A. 1
B. 2
C. 3
D. 4
Ans : 3
Q.16 Radio channels are attractive medium because __________
A. Can penetrate walls
B. Connectivity can be given to mobile user
C. Can carry signals for long distance
D. All of the above
Ans : All of the above
Q.17 Geostationary satellites ___________.
A. Are placed at a fixed point above the earth
B. Rotate the earth about a fixed axis
C. Rotate the earth about a varying axis
D. All of the above
Ans : Are placed at a fixed point above the earth
