Correct answer
Half a revolution of the crankshaft.
Half a revolution: 180 degrees. A stroke is the piston’s movement from top dead centre to bottom dead centre or vice versa. The complete four-stroke cycle requires four strokes and two crankshaft revolutions, 720 degrees. A stroke, a complete cycle and the firing interval between different cylinders are distinct concepts.
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One revolution of the crankshaft.
Half a revolution of the crankshaft.
Two revolutions of the crankshaft.
The real exam in English is a translation of the Spanish original; compare both here.
Show the Spanish original
En un motor convencional de cuatro cilindros y cuatro tiempos, ¿cuánto gira el cigüeñal durante una carrera completa de un pistón, de un punto muerto al otro?
- Media vuelta del cigüeñal.(Correct answer)
- Una vuelta del cigüeñal.
- Dos vueltas del cigüeñal.
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