Steam Engine · World History

In a 'double-acting' steam engine, how is the steam applied?

  1. Only to the top of the piston
  2. To both sides of the piston alternately
  3. To two different engines at the same time
  4. Twice for every one rotation of the flywheel
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Correct answer: To both sides of the piston alternately

James Watt's double-acting engine admitted steam to both the top and bottom of the piston. This provided a power stroke in both directions, making the engine much more powerful and producing smoother motion for industrial use.

Difficulty: Medium Question 20 of 20

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