Three transmission methods are - CORRECT ANSWER-Symplex, half duplex, full
duplex
The choice of a specific transport medium is influenced by 5
... [Show More] economics and technical
considerations such as the: - CORRECT ANSWER-Physical construction, type of
services, topology and size of the network, transmission path distance, transmission
performance characteristics of the cabling.
Twisted pair cable is called balanced cable because: - CORRECT ANSWER-The
physical construction of both conductors and the associated connections transmit
information electrically at the same potential referenced to ground.
Coaxial cable is unbalanced because: - CORRECT ANSWER-The two conductors in
the associated connections transmit information electrically at different potentials
referenced to ground.
__________ current has a rapid increase and decrease of the voltage that cannot be
perceived by the eye. - CORRECT ANSWER-Alternating or AC
__________ refers to a steady value that does not change the polarity of the voltage for
the direction of the current. - CORRECT ANSWER-Direct current or DC
A battery is an example of a _____ source. - CORRECT ANSWER-Direct current or DC
EMI - CORRECT ANSWER-Electromagnetic interference
EM I can be __________ or __________ to the cable - CORRECT ANSWER-External
or internal
AXT - CORRECT ANSWER-Alien crosstalk
What is alien crosstalk? - CORRECT ANSWER-Other cables, external to the cable, that
cause electromagnetic interference.
Five examples of external EMI - CORRECT ANSWER-Other cables, motors,
fluorescent lighting, switching power supplies, powered radio equipment and antennas
Crosstalk definition - CORRECT ANSWER-Electromagnetic interference, internal to the
cable , that comes from another pair within the sheath
Two examples of internal electromagnetic interference - CORRECT ANSWER-Cross
talk or coming from the cables shield, screen, or other metallic component that is
improperly bonded and grounded
Net current fields we can directly with __________ - CORRECT ANSWER-Distance
High-current fields weekend with - CORRECT ANSWER-the cube of the distance (fast)
Shielding is ineffective for __________ but is effective for __________ - CORRECT
ANSWER-Net current fields, high-current fields
Frequency defined - CORRECT ANSWER-The number of cycles a signal is repeated in
a given time period.
1 cycle in 1 s = ___ Hz - CORRECT ANSWER-1
60 cycles in 1 s = _____ Hz - CORRECT ANSWER-60
1000 cycles in 1 s = _______________ - CORRECT ANSWER-1 kilohertz (kHz)
1 million cycles in 1 s = _____________ - CORRECT ANSWER-1 megahertz (MHz)
1 billion cycles in 1 s = ___________ - CORRECT ANSWER-1 gigahertz (GHz)
1 trillion cycles in 1 s = __________ - CORRECT ANSWER-1 terahertz (THz)
Humans can hear frequencies that range from _____ hertz to _____ hertz - CORRECT
ANSWER-20 Hz to 20,000 Hz
Voice-grade transmission of speech is generally limited to between _____ hertz and
_____ hertz - CORRECT ANSWER-300 Hz and 3400 Hz
Electrical power measured in watts has two variations known as - CORRECT
ANSWER-Apparent (or reactive) power and true (or real) power
When measured in conjunction with a time element such as seconds or hours electrical
power applies to — - CORRECT ANSWER-The energy consumed by an electrical
device (such as a motor, amplifier, or telephone transmitter) over a period of time
The energy consumed by an electrical device such as a motor, amplifier, or telephone
transmitter over a period of time is typically measured in __________ - CORRECT
ANSWER-Kilowatt hours (kWh)
Power is derived from __________ and __________ - CORRECT ANSWER-Electrica [Show Less]