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      Question

      In internal combustion engines, which process occurs

      during the power stroke?
      A Compression of air Correct Answer Incorrect Answer
      B Exhaust gas release Correct Answer Incorrect Answer
      C Air-fuel intake Correct Answer Incorrect Answer
      D Combustion and expansion Correct Answer Incorrect Answer
      E Valve clearance adjustment Correct Answer Incorrect Answer

      Solution

      During the power stroke, the air-fuel mixture combusts, resulting in rapid gas expansion. This pushes the piston downward, producing the mechanical power that drives the engine.

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