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Northern IrelandMotor Vehicle & Road User StudiesQuick questions
The motor vehicle: engine and systems
Quick questions on The four-stroke petrol engine cycle - CCEA GCSE MVRUS
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are the four strokes?Show answer
The cycle has four strokes (two up, two down); the crankshaft turns twice for one complete cycle.
What is valve positions - a key exam point?Show answer
So both valves are closed during compression and power - the part of the cycle that must be sealed for compression and combustion.
What is q1?Show answer
Give the four strokes in the correct order. [2 marks]
What is q2?Show answer
During which stroke does the spark plug ignite the mixture? [1 mark]
What is q3?Show answer
Name the two strokes during which both valves are closed. [1 mark]
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