The Stirling Engine

What is the basic principle behind the stirling engine?
Heat gradients
Motorized work
Cranks
Basic machines
What percent efficiency does a well crafted stirling engine peak at?
100%
75%
50%
25%
Which is not a process in the stirling engine cycle?
Isothermal Expansion of Fluid
Isovolumetric Heat Addition
Isothermal Heat Removal
Isovolumetric Heat Removal
How would you be able to reverse the cycle direction of the stirling engine?
Initializing the spin the other direction
Switching the direction of the heat gradient
Start off with the displacer at the top
Move the crank 90 degrees.
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