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WHo will ace our viva?

Discussion in 'Electronic Basics' started by nikhil, Nov 8, 2003.

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  1. nikhil

    nikhil Guest

    Some interesting debatable questions from our vivas:
    1] Why is the o/p impedance of a frequency generator very low?
    2] Why is the switch of a sig generator always on in upwards position?
  2. Baphomet

    Baphomet Guest

    #1 - So that the generator is minimally affected by the load, and that
    standing waves are reduced when using properly terminated coax cable.

    #2 - As well as most other electronic equipment using a power toggle
    switch. Ergonomically, it is probably easier to turn off with a downward
    motion than with an upward motion.
  3. Fred Abse

    Fred Abse Guest

    Nicely put, Baph.
    "Up for on" is the rule for industrial switchgear, even where the local
    rule for things like light switches is the other way. "Gravity failsafe" -
    if some idiot hangs something on the switch, it can't start something
    that'll take somebody's head off.

    In the case of signal generators, I suspect that standardization for
    military use might have something to do with it.
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