Disaster And Failure Final

100 Questions

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Disaster And Failure Final

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Questions and Answers
  • 1. 
    A Truss is a
    • A. 

      A load bearing column that holds a bridge up

    • B. 

      A strongly held anchor a bridge is secured with

    • C. 

      Lattice works used to relieve the deck of tension and compression forces

    • D. 

      Span between piers which caries a live load

  • 2. 
    To design and build a safe bridge, an engineer must understand all of the following except
    • A. 

      The forces caused by things that interact with the bridge

    • B. 

      How the materials will react to the forces over the life of the bridge

    • C. 

      The force of gravity

    • D. 

      Aesthetically pleasing architecture

  • 3. 
    The relative ease of using the materials wood, stone, concrete and steel (From poorest to best) are
    • A. 

      Wood, stone, concrete, steel

    • B. 

      Stone, steel, concrete, wood

    • C. 

      Wood, concrete, steel, stone

    • D. 

      Stone, steel, wood, concrete

  • 4. 
    Which bridge is best suited for carrying heave loads such as trains
    • A. 

      Suspension

    • B. 

      Arch

    • C. 

      Cable-stayed

    • D. 

      Cantilever

  • 5. 
    One o the major problems leading to the Tay Bridge Disaster of 1879 was
    • A. 

      Use of poor steel quality

    • B. 

      Use of pier and beam bridge where a truss bridge was called for

    • C. 

      Lack of inspection during construction as well as after the bridge went into service

    • D. 

      The hiring of an incompetent job foreman

  • 6. 
    Which of the following was NOT a major factor in the Quebec bridge construction disaster
    • A. 

      Attempts to cut construction costs

    • B. 

      Lack of on site experience personal

    • C. 

      Use of substandard quality materials

    • D. 

      Failure to test design changes

  • 7. 
    Torsion forces tend to
    • A. 

      Tear structures apart (like two people pulling your arms in opposite directions)

    • B. 

      Push structures in on themselves (like the crushing effect of a head-on car collision)

    • C. 

      Twist structures apart (like having the top half of your body twisted in one direction and the bottom half twisted in the opposite way)

    • D. 

      Tear structures like ripping pages

  • 8. 
    Static equilibrium refers to forces which
    • A. 

      Equal force pushing in opposite directions that exactly balance each other

    • B. 

      Balance achieved with electromagnetic forces

    • C. 

      Are stronger than gravitational forces

    • D. 

      Result from the dead load of a bridge

  • 9. 
    Which of the following statements concerning the Silver Bridge Disaster (1967) is NOT true
    • A. 

      It was the worst bridge disaster in US history

    • B. 

      It was sort of, but not exactly, a suspension bridge

    • C. 

      It was aggravated by heavy Christmas Traffic

    • D. 

      The resulting bridge inspection program continues to ensure safe bridge today

  • 10. 
    The Tacoma Narrows Bridge Disaster (1940) was due, in part, to
    • A. 

      The use of excessively wide deck spans

    • B. 

      The construction material was too light

    • C. 

      Ice build up around the piers in cold weather

    • D. 

      The difficulty in securing the 2 cantilever arms

  • 11. 
    A hypothesis is
    • A. 

      Plan

    • B. 

      Fact

    • C. 

      Theory

    • D. 

      Law of nature

  • 12. 
    Systematic error in a set of measurements is usually the result of....
    • A. 

      Some limitation in the data collection process

    • B. 

      Some uniform problems in the data collection

    • C. 

      Improper measurement techniques

    • D. 

      A problem with the system being observed

  • 13. 
    Which of the following is NOT a category of knowledge gained by studying disasters according to our class notes?
    • A. 

      How we build things

    • B. 

      The quality of our technical education system

    • C. 

      Our understanding of science

    • D. 

      Insight into ourselves

  • 14. 
    A suspicious coin comes up head 70 times in 100 flips. What is a good estimate for the probability of heads occuring
    • A. 

      30%

    • B. 

      50%

    • C. 

      70%

    • D. 

      Can't decide on the basis of the data provided

  • 15. 
    A scientist is most apt to engage in which of the following activities
    • A. 

      Advancing our understanding of natural phenomena

    • B. 

      Only accepting what can be proven true

    • C. 

      Application of knowledge to solve problems

    • D. 

      Arguing the absolute truth of strongly held beliefs

  • 16. 
    Random error is usually addressed by
    • A. 

      Using better equipment

    • B. 

      Rounding the least significant measured digits

    • C. 

      Taking fewer measurements

    • D. 

      Taking more measurements

  • 17. 
    In testing a hypothesis, if discrepancies between the tests and hypothesis occur one may have too... 
    • A. 

      Modify the hypothesis to account for the new behavior discovered in testing

    • B. 

      Abandon the hypothesis for being wrong

    • C. 

      Use a different set of test for the hypothesis

    • D. 

      Ignore the data not fitting the hypothesis

  • 18. 
    For normally distributed values, approximately how many fall within 1 standard deviation of the mean
    • A. 

      68%

    • B. 

      80%

    • C. 

      95%

    • D. 

      99%

  • 19. 
    All but ONE of the following represent some of the tools used in testing a hypothesis. Which one isn't? 
    • A. 

      Perform a simulation of the problem

    • B. 

      Report the problem in scholarly journals in the hope that someone else has solved it

    • C. 

      Use of models or prototypes

    • D. 

      Use of well-accept scientific laws

  • 20. 
    If there is a 5% chance of some event occurring, then the probability of occurrence is... 
    • A. 

      5

    • B. 

      .5

    • C. 

      .05

    • D. 

      .005

  • 21. 
    The apollo 13 accident started with 
    • A. 

      Capsule tiles loosened during liftoff

    • B. 

      Human error during a guidance maneuver

    • C. 

      Loss of battery power in the lunar module

    • D. 

      The explosion of 1 of 2 oxygen tanks

  • 22. 
    The order (First to last) of the US space programs
    • A. 

      Mercury, gemini, Apollo

    • B. 

      Mercury, Apollo, Gemini

    • C. 

      Gemini, Mercury, Apollo

    • D. 

      Gemini, Apollo, Mercury

  • 23. 
    The shuttle has prove to have? 
    • A. 

      A effort of limited engineering success

    • B. 

      Provided great insight into interplanetary flight

    • C. 

      Be costly to than earlier launch vehicles

    • D. 

      A string of disasters similar to those of Apollo

  • 24. 
    Prior to the use of shuttles, American astronauts were recovered using which technique
    • A. 

      Flying a capsule to Edwards AFB

    • B. 

      Parachuting a capsule to an ocean landing

    • C. 

      Parachuting a capsule onto land

    • D. 

      Parachuting a capsule onto an aircraft carrier

  • 25. 
    NASA has been criticized in both the Apollo and shuttle disasters for
    • A. 

      Lacking talented engineers and scientists

    • B. 

      Fixing problems after they arise rather than avoiding them in the first place

    • C. 

      Over reliance on outside review panels

    • D. 

      "Sweeping problems under the rug"- that is, ignoring them until it is too late

  • 26. 
    The movie Apollo 13.... 
    • A. 

      Erroneously shows the crew circling the moon

    • B. 

      Is fairly accurate in depicting actual events

    • C. 

      Fails to show the ground crew incompetence

    • D. 

      Hints of sabotage by Earth day advocates

  • 27. 
    Which of the following was the worst (ie greatest loss of life) US space program related accident
    • A. 

      The Challenger shuttle disaster

    • B. 

      The Apollo 9 disaster

    • C. 

      The Columbia shuttle disaster

    • D. 

      The Apollo 1 fire

  • 28. 
    The major factor contributing to the Apollo 1 disaster was? 
    • A. 

      The bulkiness of the space suits then in use

    • B. 

      The lack of available fire fighters

    • C. 

      The use of pure 02 capsule environment

    • D. 

      Overconfidence on the part of astronauts

  • 29. 
    America achieved which of the following space firsts (i.e. ahead of the Soviets) 
    • A. 

      Launched first satellite

    • B. 

      Launched first manned satellite

    • C. 

      First to land man on the moon and return

    • D. 

      First to land man on mars and return

  • 30. 
    The first USA EV (space walk) occurred during which of the following programs?
    • A. 

      Apollo

    • B. 

      Shuttle

    • C. 

      Mercury

    • D. 

      Gemini

  • 31. 
    If the burnout velocity of an earth bound object exceeds its escape velocity then the object will... 
    • A. 

      Behave like a ballistic missile

    • B. 

      Escape the pull of earth's gravity

    • C. 

      Continue to accelerate forever

    • D. 

      Ignite (burn out) on reentry

  • 32. 
    Lunar colonies would be preferable to the ISS because...
    • A. 

      The offer ample room to develop agriculture

    • B. 

      Launches are easier due to reduced gravity

    • C. 

      They provide a long term stable platform

    • D. 

      All of the above

  • 33. 
    LEO, in the context of unit 10 notes, refers to... 
    • A. 

      An astrological sign

    • B. 

      Leaked energy output

    • C. 

      Lost extraterrestrial object

    • D. 

      Low earth orbit

  • 34. 
    The space shuttle has proven to be.... 
    • A. 

      Dangerous

    • B. 

      Difficult to operate

    • C. 

      Too limited in its capacity and range

    • D. 

      All of the above

  • 35. 
    According to the class notes, the major problem facing the ISS has been... 
    • A. 

      Russia's failure to deliver quality equipment

    • B. 

      Changing policies and requirements

    • C. 

      Its excessively high orbit

    • D. 

      All of the above

  • 36. 
    The Challenger disaster has been attributed to... 
    • A. 

      Problems with the ceramic heat tiles

    • B. 

      The pure oxygen cabin environment

    • C. 

      Lack of O-ring flexibility in cold weather

    • D. 

      Poorly designed external fuel tanks

  • 37. 
    Which of the following is NOT cited as a problem with the International Space Station (ISS) 
    • A. 

      It is overly complex and attempted to much

    • B. 

      It has been understaffed

    • C. 

      Its altitude is too high

    • D. 

      Too little return on its investment cost

  • 38. 
    The advantage of liquid fuel rocket over a solid state rocket is... 
    • A. 

      The weight of the fuel it uses

    • B. 

      It's easier to stop and restart liquid fuel rockets

    • C. 

      The cost of the fuel

    • D. 

      The shelf life (max storage of time) of liquid fuel

  • 39. 
    Problems faced by unmanned space programs include... 
    • A. 

      Too expensive to develop and support

    • B. 

      Their inability to gather useful information

    • C. 

      Resistance to the idea by the military and others

    • D. 

      Lack of ground based support facilities

  • 40. 
    Which of the following is NOT considered a current problem with the US space program
    • A. 

      Poorly trained scientists and engineers

    • B. 

      Lack of shuttle flights after 2010

    • C. 

      Changing policies and priorities

    • D. 

      Lack of ground based support facilities

  • 41. 
    Which of the following is NOT listed in the class notes as a factor in the Three Mile island disaster? 
    • A. 

      Service and control lines were cross connected

    • B. 

      Control valves left off during maintenance

    • C. 

      Tired and overworked staff

    • D. 

      Reactor water level can't be measured directly

  • 42. 
    To gain access to chemical forces you need... 
    • A. 

      A chemical reaction

    • B. 

      Nuclear fission or fusion

    • C. 

      To apply mechanical energy, e.g. movement

    • D. 

      To compress or heat a substance

  • 43. 
    Which of the following was a problem associated with the Chernobyl disaster? 
    • A. 

      The use of PWR reactors

    • B. 

      The use of more difficult fusion disasters

    • C. 

      A failure to SCRAM the reactor

    • D. 

      Lack of containment building

  • 44. 
    Water passing through the reactor is kept from boiling and heats a second loop of water that creates the steam for running the turbine 
    • A. 

      PWR

    • B. 

      BWR

    • C. 

      HWR

    • D. 

      FBR

  • 45. 
     A __________________ can run on the spent fuels of other reactors.
    • A. 

      PWR

    • B. 

      BWR

    • C. 

      HWR

    • D. 

      FBR

  • 46. 
    Water passing through the reactor is allowed to boil to create the steam fro running the turbine? 
    • A. 

      PWR

    • B. 

      BWR

    • C. 

      HWR

    • D. 

      FBR

  • 47. 
    According to class notes, work is defined to be
    • A. 

      The application of energy

    • B. 

      Potential or stored energy

    • C. 

      Kinetic or moving energy

    • D. 

      Transfer of energy from 1 system to another

  • 48. 
    Control rods are used in nuclear reactors 
    • A. 

      As a source of nuclear fuel

    • B. 

      To stop or slow the reactor's chain-reaction

    • C. 

      To control other elements such as water level

    • D. 

      As a substitute for human controllers due to the dangers involved

  • 49. 
    Which of the following is NOT a primary force
    • A. 

      Electromagnetic force

    • B. 

      Static force

    • C. 

      Strong and weak nuclear bonding fore

    • D. 

      Gravitational force

  • 50. 
    Which of the following was NOT a consequence in the aftermath of Three Mile Island? 
    • A. 

      Reactor 1 is shut down for 6 years

    • B. 

      Most new reactor orders are cancelled

    • C. 

      Failings of containment structures made apparent

    • D. 

      Public's decline in the faith of nuclear power

  • 51. 
    Power is measured in
    • A. 

      Volts

    • B. 

      Amps

    • C. 

      Ohms

    • D. 

      Watts

  • 52. 
    The lecture slides used the letter ___ to indicate "Current"
    • A. 

      C

    • B. 

      I

    • C. 

      N

    • D. 

      O

  • 53. 
    Which of the following was mentioned in class, but not in the notes, as an enemy of the Power Grid?
    • A. 

      War

    • B. 

      Economics

    • C. 

      Terrorists

    • D. 

      Nature

  • 54. 
    A possible short term solution to the country's increasing power need is... 
    • A. 

      Use of HVDC on the current AC lines

    • B. 

      The development of a "hydrogen grid"

    • C. 

      The use of fusion nuclear power

    • D. 

      Use of biodegradable duel in power plants

  • 55. 
    The commercial power coming into the typical American home has a voltage in the range of.... 
    • A. 

      50-110

    • B. 

      110-220 volts

    • C. 

      200-600 volts

    • D. 

      600-1200 volts

  • 56. 
    Which of the following is NOT a problem listed in the class notes with AC power transmission?
    • A. 

      Conversion to DC power

    • B. 

      Danger to humans

    • C. 

      Limited space for new power lines

    • D. 

      Maintaining the load balance and phase on generators

  • 57. 
    Transformers are used to... 
    • A. 

      Convert AC to DC power

    • B. 

      Convert DC to AC power

    • C. 

      Convert AC voltage levels

    • D. 

      Convert 3 phase power into single phase power

  • 58. 
    Which of the following was NOT a factor leading up to the California Energy crisis (2000-2001) ? 
    • A. 

      Deploying 100s of solar wind generators

    • B. 

      A cap on retail, but not wholesale, power cost

    • C. 

      The high cost of natural gas

    • D. 

      A drought affecting hydroelectric power plans

  • 59. 
    The primary obstacle to implementing a hydrogen grid is? 
    • A. 

      Lack of technological capability

    • B. 

      High cost

    • C. 

      Large size of individual home units

    • D. 

      Resistance by environmentalists

  • 60. 
    An advantage of HVDC power transmission is?
    • A. 

      Ability to carry more power over a given line

    • B. 

      The ease of tapping into the line

    • C. 

      Power loss is independent of distance traveled

    • D. 

      Low cost of DC to AC power conversion

  • 61. 
    Relative to airplanes, lighter than air vehicles tend to be... 
    • A. 

      Slow, short ranged, and efficient to fly

    • B. 

      Fast, long range, and safe

    • C. 

      Slow, long range, and dangerous

    • D. 

      Long range, efficient, and safe

  • 62. 
    Which of the following was NOT  problem with the De Havilland Comet 1 passenger jet? 
    • A. 

      Fuselage skin was too thin

    • B. 

      Frequent engine failure

    • C. 

      Use of square windows

    • D. 

      Loss of wing lift when pulled up to fast

  • 63. 
    The major challenge with heavier than airplanes is their inherent.... 
    • A. 

      Inefficiency due to all the lift required

    • B. 

      Dangers of flying so high

    • C. 

      Requirement for long runways

    • D. 

      Noise pollution over populated areas

  • 64. 
    The problem with prop driven planes occurs when... 
    • A. 

      Foreign debris is sucked into the engines

    • B. 

      Above 10,000 feet they are very inefficient

    • C. 

      Their gyroscopic effect impacts flight control

    • D. 

      The speed of the prop tip approaches Mach 1

  • 65. 
    An airfoil with the proper angle of attack achieves lift when the speed of teh air flowing over it is ________ the speed of the air flowing under it. 
    • A. 

      Equal to

    • B. 

      Greater than

    • C. 

      Less than

    • D. 

      Greater than or equal too

  • 66. 
    The first modern (and probably most successful) commercial passenger aircraft was? 
    • A. 

      The Douglas DC-3

    • B. 

      The Ford Trimotor

    • C. 

      The Boeing 747

    • D. 

      The Boeing model 377 Stratocruiser

  • 67. 
    Lift is primarily required to counteract the effect of which of the following forces? 
    • A. 

      Electromagnetic

    • B. 

      Thrust

    • C. 

      Drag

    • D. 

      Gravity

  • 68. 
    After their initial use in military applications, airplanes found their next area of wide applications in? 
    • A. 

      Passenger service

    • B. 

      Mail service

    • C. 

      Hauling freight

    • D. 

      Crop dusting

  • 69. 
    Why do modern commercial aircraft usually fly above 30,000 feet altitude?
    • A. 

      To avoid the congestion of lower altitudes

    • B. 

      Engines run better in the cooler atmospher

    • C. 

      Less air drag to overcome than lower levels

    • D. 

      Lift is greater at altitudes above 30,000 feet

  • 70. 
    Why are cabins pressurized in modern passenger airlines flying above 30,000 ft?
    • A. 

      The air pressure is too low at that altitude for humans to effectively breathe

    • B. 

      It reduces the risk from fuselage to metal fatigue

    • C. 

      It reduces the risk of fire and other hazards

    • D. 

      Like a deep sea submarine, the fuselage must pressurized or it would implode

  • 71. 
    Ionizing radiation is produced by? 
    • A. 

      Knocking a neutron out of its normal orbit

    • B. 

      Knocking an electron out of its normal orbit

    • C. 

      Knocking a proton out of its normal orbit

    • D. 

      All of the above

  • 72. 
    The Linac (linear accelerator) generates which kinds of beams in the Therac-25? 
    • A. 

      Alpha-rays and beta-rays

    • B. 

      Alpha-rays and gamma-rays

    • C. 

      Beta-rays and gamma-rays

    • D. 

      Beta-rays and x-rays

  • 73. 
    Radiation of cancer patient "cures" cancer cells by what means? 
    • A. 

      Creating free ions which damage their DNA

    • B. 

      By generating sufficient heat to kill them

    • C. 

      By starving them from blood and its oxygen

    • D. 

      By alerting the body's immune system

  • 74. 
    X-rays are an example of what type of radiation? 
    • A. 

      Electromagnetic

    • B. 

      Energetic charged particle

    • C. 

      Energetic non-charged particle

    • D. 

      None of the above

  • 75. 
    Alpha-rays are an example of what type of radiation? 
    • A. 

      Electromagnetic

    • B. 

      Energetic charged particles

    • C. 

      Energetic non-charged particles

    • D. 

      Non of the above

  • 76. 
    Beta-rays are an example of what type of radiation? 
    • A. 

      Electromagnetic

    • B. 

      Energetic charged particles

    • C. 

      Energetic non-charged particles

    • D. 

      None of the above

  • 77. 
    Gamma-rays are an example of what type of radiation? 
    • A. 

      Electromagnetic

    • B. 

      Energetic charged particle

    • C. 

      Energetic non-charged particle

    • D. 

      None of the above

  • 78. 
    Magnetic Resonance Imaging (MRI) is an example of?
    • A. 

      Treatment using ionization radiation

    • B. 

      Treatment not using ionization radiation

    • C. 

      Diagnosis not using ionization radiation

    • D. 

      Diagnosis using ionization radiation

  • 79. 
    One of the problems with the Therac-25 was: 
    • A. 

      The use of inadequate computer equipment

    • B. 

      Using under tested computer based systems

    • C. 

      The use of untrained personnel

    • D. 

      Relying on manual alignment of the beams

  • 80. 
    Which of the following were responsible for the deaths caused by the Therac-25? 
    • A. 

      The hospitals

    • B. 

      AECL

    • C. 

      The technicians

    • D. 

      All of the above

  • 81. 
    Which of the following statements is true concerning Spam? 
    • A. 

      It's unsupported by manufactures of advertised items

    • B. 

      It stands for Simple Product Advertising Mail

    • C. 

      It accounts for around 50% of all email

    • D. 

      It is much cheaper than traditional junk mail

  • 82. 
    According to our slides author, the internet can be viewed in terms of which of the following 3 items? 
    • A. 

      Protocols, domains, and commercial activities

    • B. 

      Hardware, software, and standards

    • C. 

      ISPs, the backbone, and access speed

    • D. 

      Browser type, URLs, and access point

  • 83. 
    Phishing refers to?
    • A. 

      Intercepting of in transit data packets

    • B. 

      Breaking into on-line databases

    • C. 

      One person acting like another to get info

    • D. 

      Software acting like another program to get info

  • 84. 
    Which of the following is NOT cited by our author as a problem with information obtained from the web? 
    • A. 

      Dead links

    • B. 

      Lack of quality control

    • C. 

      The shear volume of information

    • D. 

      A lack of organization

  • 85. 
    According to our slides author, search engines traditionally base their ranking of a given page using which of the following?
    • A. 

      Number of other sites the page links to

    • B. 

      Number of other sites that link to the page

    • C. 

      Number of times key words occur on the page

    • D. 

      Number of hits by user on the page

  • 86. 
    Most private information is obtained using which of the following techniques 
    • A. 

      Phishing

    • B. 

      Spoofing

    • C. 

      Cracking into on-line databases

    • D. 

      Sniffing

  • 87. 
    Which of the following is LEAST likely to be an indicator of the quality of information on a website? 
    • A. 

      The number and quality of its graphics

    • B. 

      Use of peer reviews of the site's information

    • C. 

      The domain type

    • D. 

      Interests of the information author

  • 88. 
    A trojan horse is which of the following?
    • A. 

      Harmful software disguised as legitimate

    • B. 

      Software which is bypasses authentication

    • C. 

      Self reproducing program in a file or program

    • D. 

      Software that collect and sends information

  • 89. 
    HTTP is a standard for
    • A. 

      Specifying internet addresses

    • B. 

      Creating documents to render with a browser

    • C. 

      Transferring web pages

    • D. 

      None of the above

  • 90. 
    The TCP protocol is an example of a
    • A. 

      Datalink level protocol

    • B. 

      Transport level (layer) protocol

    • C. 

      Network level protocol

    • D. 

      Application level protocol

  • 91. 
    Historically, Bell Telephone equipment has been noted for what? 
    • A. 

      Low quality and little innovation

    • B. 

      High quality and little innovation

    • C. 

      Low quality and many innovations

    • D. 

      High quality and many innovations

  • 92. 
    Out-of-band switching refers to what?
    • A. 

      Use of special lines for control signals

    • B. 

      Special frequency bands for control signals

    • C. 

      Sending control signals over phone lines

    • D. 

      All of the above

  • 93. 
    Connecting computers together over a network is called?
    • A. 

      Tightly coupled computing

    • B. 

      Loosely coupled computing

    • C. 

      Parallel computing

    • D. 

      Distributed computing

  • 94. 
    Fault tolerant computing involves what?
    • A. 

      Reducing the cost of distributed computing

    • B. 

      Increase the reliability using duplicate computers

    • C. 

      Reduce the number of computers to do a job

    • D. 

      Computers that are tolerant of input data error

  • 95. 
    The AT&T failure of January 15, 1990, was a result of what?
    • A. 

      Failure to include reliability safeguards

    • B. 

      Poor judgement by maintenance personnel

    • C. 

      Failure to perform test on new software

    • D. 

      Error in software used to protect the system

  • 96. 
    An "off hook" condition is primarily used to signal the phone company switch which of the following? 
    • A. 

      To expect a phone number to be dialed

    • B. 

      The conclusion of a phone call

    • C. 

      A busy signal

    • D. 

      An error in the phone system

  • 97. 
    A land-line home phone connects to an "end office" via which type of line? 
    • A. 

      An ISDN line

    • B. 

      A connecting trunk line

    • C. 

      A coax cable

    • D. 

      A local loop

  • 98. 
    During the period from the 1920's to the mid-1960's, the US phone sytem was characterized by...
    • A. 

      Human intensive operation

    • B. 

      Mechanical intensive operation

    • C. 

      Electronic intensive operations

    • D. 

      All of the above

  • 99. 
    A large number of computers loosely connected via the internet is an example of? 
    • A. 

      A cluster

    • B. 

      Beowolf

    • C. 

      Home network

    • D. 

      Grid

  • 100. 
    Of the following pairs, which are both considered parts of a typical telephone? 
    • A. 

      A branch exchange and a way to dial

    • B. 

      A microphone and a local loop

    • C. 

      A ringer and an amplifier

    • D. 

      An amplifier and trunk line