1) Only analog signals can be used to transmit information. a) True b) False 2)
ID: 645490 • Letter: 1
Question
1) Only analog signals can be used to transmit information.
a) True b) False
2) In half-duplex communication between two hosts, both hosts can transmit, and both hosts can receive, but hosts cannot transmit and receive simultaneously.
a) True b) False
3) An analog signal maintains a constant signal level for a period of time, then abruptly changes to a different constant level.
a) True b) False
4) Guided transmission media employ an antenna for transmitting through air or vacuum.
a) True b) False
5) In general, digital to analog modulation equipment is less expensive than the equipment for encoding digital data into a digital signal.
a) True b) False
6) The ___ of a signal is the range of frequencies that it contains.
a) spectrum b) effective bandwidth c) wavelenghth d) absolute bandwidth
7) ___ consists of a central conductor surrounded by a shield (usually a wire braid).
a) twisted pair cable b) coaxial cable c) antenna d) optical fiber
8) ___ consists of two insulated wires arranged in a spiral. This type of cable may have multiple pairs of conductors.
a) optical fiber b) antenna c) coaxial cable d) twisted pair cable
9) ___ consists of two insulated wires arranged in a spiral. This type of cable may have multiple pairs of conductors.
a) True b) False
10) A codec converts an analog input into a digital signal for transmission or storage, or recovers the analog data from the received digital signal.
a) True b) False
11) A codec converts an analog input into a digital signal for transmission or storage, or recovers the analog data from the received digital signal.
a) True b) False
12) Modulation techniques involve changing one or more of the three fundamental frequency-domain parameters (select all that apply):
a) cable b) frequency c) amplitude d) modem e) codec f) phase
13) A socket is a combination of what two things?
a) power plug b) Ip address c) ethernet jack d) port number
14) ___ defines a series of standards for encoding audio and video in digital form for storage or transmission. Most of these standards include compression, often lossy compression.
a) JPEG b) ANSI c) ISO d) MPEG
15) ___ is a group that defines standards for lossy compression of digital images, and also the name of the standard defined by the group.
a) MPEG b) ANSI c) JPEG d) ISO
16) Nyquist states that the bit rate of a noise-free digital transmission can be no more than one-half the bandwidth of the signal.
a) True b) False
17) The main benefit of shielded twisted pair cabling over unshielded twisted pair is that STP is much more durable.
a) True b) False
18) The ANSI/TIA-568-C standards relate to cabling specifications. Among the standards defined are the categories of twisted pair cabling.
a) True b) False
Explanation / Answer
1)False
2)True
3)False
4)False
5)False
6)Spectrum
7)Coaxial cable
8)Twisted Pair Cable
9)Twisted Pair Cable
10)True
11)True
12)amplitude, frequency, and phase
13)Ip address and port number
14)iso
15)jpeg
16)False
17)True
18)True
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