All real engines are less efficient than the Carnot engine because
A. they do not operate through the Otto cycle.
B. they do not operate through a reversible cycle.
C. the working substance does not maintain a constant volume through the cycle.
D. the working substance does not maintain a constant pressure through the cycle.
E. the working substance does not maintain a constant temperature through the cycle.
Answer: B
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When tuning a radio to a particular station, you match the frequency of the internal electrical circuit with the frequency of the wanted radio station. What principle is being employed?
A) forced vibrations B) resonance C) beats D) reverberation E) wave interference
A two-shell-four-tube-pass heat exchanger has an overall heat exchanger conductance of 350 W/m^2?K and is used to cool 10 kg/s of engine oil from 180ºC to 80ºC. If water at 20ºC is used to cool the oil and the water temperature leaving the heat exchanger is 60ºC, determine (a) mass flow of water required and (b) surface area of the heat exchanger.
What will be an ideal response?
As we look at larger and larger scales in the universe, we find
A) a larger and larger percentage of the matter is dark. B) almost exclusively visible matter. C) a larger and larger percentage of the matter is visible. D) smaller and smaller masses. E) an equal amount of visible and dark matter.
According to Heisenberg, as the uncertainty in the measurement of a particle's momentum is increased by a factor of 2, by what factor is the uncertainty in that particle's position changed?
a. 1 c. 1/2 b. 4 d. 2