Automobile Engineering in ME
The ignition in a spark ignition engine takes place when the piston is

Exactly at the T.D.C. position on its compression stroke
Leaving the T.D.C. position on its compression stroke
Approaching the T.D.C position on its exhaust stroke
Approaching the T.D.C. position on its compression stroke

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Automobile Engineering in ME
An imbalance wheel during vehicle operation

Creates a standing wave
Deflects in the vehicle's longitudinal direction
Makes large noise when its heavy point hits the road surface
Bounces vertically or deflects from side to side (as seen from front or rear)

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