BICSI Technician- Netcom - Chapter 1 Questions With Correct Answers 100%

Three transmission methods are - Answer-Symplex, half duplex, full duplex The choice of a specific transport medium is influenced by 5 economics and technical considerations such as the: - 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: - 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: - 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. - Answer-Alternating or AC __________ refers to a steady value that does not change the polarity of the voltage for the direction of the current. - Answer-Direct current or DC A battery is an example of a _____ source. - Answer-Direct current or DC EMI - Answer-Electromagnetic interference EM I can be __________ or __________ to the cable - Answer-External or internal AXT - Answer-Alien crosstalk What is alien crosstalk? - Answer-Other cables, external to the cable, that cause electromagnetic interference.Five examples of external EMI - Answer-Other cables, motors, fluorescent lighting, switching power supplies, powered radio equipment and antennas Crosstalk definition - Answer-Electromagnetic interference, internal to the cable , that comes from another pair within the sheath Two examples of internal electromagnetic interference - 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 __________ - Answer-Distance High-current fields weekend with - Answer-the cube of the distance (fast) Shielding is ineffective for __________ but is effective for __________ - Answer-Net current fields, highcurrent fields Frequency defined - Answer-The number of cycles a signal is repeated in a given time period. 1 cycle in 1 s = ___ Hz - Answer-1 60 cycles in 1 s = _____ Hz - Answer-60 1000 cycles in 1 s = _______________ - Answer-1 kilohertz (kHz) 1 million cycles in 1 s = _____________ - Answer-1 megahertz (MHz) 1 billion cycles in 1 s = ___________ - Answer-1 gigahertz (GHz) 1 trillion cycles in 1 s = __________ - Answer-1 terahertz (THz)Humans can hear frequencies that range from _____ hertz to _____ hertz - Answer-20 Hz to 20,000 Hz Voice-grade transmission of speech is generally limited to between _____ hertz and _____ hertz - Answer-300 Hz and 3400 Hz Electrical power measured in watts has two variations known as - 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 — - 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 __________ - Answer-Kilowatt hours (kWh)