Question

In a two-stroke engine, the power stroke occurs compared to a four-stroke engine -

• A. Double
• B. Same
• C. Triple
• D. Four times Correct Answer: (A) Double

Hint:

Engine Comparison Rule: - Two-stroke engine: $1$ Power Stroke = $1$ Revolution of Crankshaft ($360^\circ$). - Four-stroke engine: $1$ Power Stroke = $2$ Revolutions of Crankshaft ($720^\circ$). Therefore, at any given RPM, a two-stroke engine fires twice (double) as frequently.

Answer 1

The Correct Option is A

Step 1: What a power stroke is.
The power stroke is the part of the cycle where the burning fuel pushes the piston and gives useful power.

Step 2: Compare the two engines.
A four-stroke engine gives one power stroke for every two turns of the crankshaft. A two-stroke engine gives one power stroke for every single turn. So for the same number of turns, the two-stroke fires twice as often.

Step 3: Final answer.
This means the power stroke happens double the times in a two-stroke engine.
\[ \boxed{\text{Double}} \]