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Thermodynamics/Efficiency

Quiz by Shelby Roth

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8 questions
Show answers
  • Q1
    Earth is an example of an
    closed system
    open system
    free system
    isolated sytem
    30s
  • Q2
    The second law of thermodynamics states that heat flows from
    it doesn't flow
    hot to cold
    in all directions
    cold to hot
    30s
  • Q3
    Energy transformations are 100% efficient.
    True
    False
    30s
  • Q4
    In any transformation, energy may be lost to
    sound
    light
    heat
    All of the above
    30s
  • Q5
    Which type of engine is most efficient?
    steam engine
    steam turbine engine
    automobile engine
    electric engine
    30s
  • Q6
    A crane uses 65000 J of input energy to do 40000 J of useful work. The efficiency of the crane is
    62%
    25%
    1.6%
    75%
    60s
  • Q7
    An coal generator is 30% efficient at converting the fuel from goal into electricity. If a generator uses 4500 J of input energy, how many Joules of useful energy are obtained? Round to the nearest whole number.
    1350
    60s
  • Q8
    A toy train that is 72% efficient produces 190 J of useful energy in movement and sound. How many Joules of input energy are required? Round to the nearest whole number.
    264
    60s

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