volume 4
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- One disadvantage of microwave wavelengths is that the frequencies are susceptible to
- weather effects
- The term defined as the bending of radio waves or light waves as they travel at an angle from one medium to a second medium with a different density is
- refraction
- What is not a factor in determining the refractive index or air?
- propagaion medium
- The determining factor is calculating the correct size of a waveguide is
- frequency
- Which satellite communications system is used for monitoring space operations?
- DSCS
- High frequency transmissions follow what path from the antenna to the distant end?
- groundwave
- Which is not a disadvantage of laser light transmission?
- no need for carful alignment of transmitter and reciever
- Which landline transmission medium is the primary carrier of voice communications?
- twisted pair cable
- What are the two most popular types of coaxial cable used in network topologies?
- thicknet and thinnet
- What LAN communications technique does coaxial cable support?
- broadband, like a highway
- An optical communications system is compromised of a
- transmitter, cable, and receiver
- Why are fiber optic cables immune to EMI?
- fibers are made of dielectric material
- Materials made of air, glass, and water are
- transparent
- The direction change of a light beam caused by going form one transparent material into another is called
- refraction
- As the index of refraction value increases, the speed of light through that material
- decreases
- Which statement best describes a fiber optic cable's critical angle?
- the smallest angle of incidence between two media where total reflection takes place
- What term refers to a fiber optic cable's core with the same refractive index throughout the cable?
- step index
- Which type of fiber is the most effective at reducing wave dispersion?
- single mode, step index fiber
- What are the two principle weighting characteristics in use with telecommunication circuit noise?
- CCITT psophometric weighting and C-message weighting
- Which multiplexing method is used when digital signals are being transmitted?
- time division
- The two major types of frame structures are
- consultative CCITT and low speed
- The method of multiplexing the T1 multiplexer uses is
- time division
- What term is associated with the delay or lag introduced in the application of voltage from one section to the next?
- propagation constant
- What component of the microprocessor does all the computing?
- Arithmetic-logic unit
- What type of microprocessor has a large instructions set that contains complex instructions?
- CISC
- If you have a 33 MHz central processing unit, what math coprocessor is not compatible
- 20 MHz coprocessor
- Main memory speed is measured in
- nanoseconds
- What type of ROM has the instructions to start the computer?
- basic I/O system
- Which one of the following is not contained in the first megabyte of memory?
- extended memory
- The distance between the head and the surface of the hard disk is known as
- flying height
- A 3.5-inch high-density magnetic disk has a storage capacity of up to
- 1.44 megabytes
- A highly dense storage medium that looks like the audio disks found in music stores is called a
- CD-ROM
- Why should you never open a computer's power supply?
- the voltage inside power supplies can kill you
- The PC power supply is rated in
- watts
- Which one of the following is not one of the main areas on the keyboard?
- QWERTY keys
- The three keys one the keyboard that, when used with the function keys, provide more functions are the
- CTRL, ALT, SHIFT
- A printer contains a buffer storage to
- allow the central processing unit to perform other functions during printing
- What type of printer uses a special paper?
- thermal printer
- how does a thermal printer form a character
- dot matrix pattern
- A monitor's resolution is expressed in the number of pixels that make up the image -- so, the sharper the image, the
- higher the resolution
- How is an element of the plasma display darkened?
- the addressing circuit redices the sustaining voltage
- Which feature of the UNIX allows any users to work on he same computer system at the same time by sharing the computer's resources?
- multiuser
- Which of the following uses for the shell in UNIX is being invoked to create programs called shell scripts?
- prgramming
- Which of the following is not a UNIX shell?
- korne shell
- What improvement gave Windows 98 the ability to connect to 127 peripherals
- universal serial bus
- Windows NT is designed to be a(n)
- full-fledged NOS
- How much memory space (bytes_ does each buffer take up?
- 512
- When the disk heads fly across the surface, in what order is data retrieved?
- the order in which it appearson the disk
- Name the access right that enables its user to act as a mini supervisor to grant rights to other users?
- access control
- What is the prime purpose of an operating system?
- improve system performance and ease of use
- The three main types of user interfaces
- command-drive, menu-driven, graphical
- In what manner does a DBMS store data?
- randomly
- The main difference between the flat-file and relational databases is
- relational databases model relationship in the real world
- The advantage of using firmware is
- faster operation and less susceptibility to unauthorized modifications