Question

The _____________ sensor, is a microphone type sensor that detects ping or pre-ignition noise so that the ignition timing can be retarded.

(a) throttle position

(b) manifold pressure

(c) camshaft position

(d) knock

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This intriguing question comes from Electronic Injection System in division Electronic Injection Systems of IC Engine

Answer 1

Right choice is (d) knock

Easiest explanation: The knock sensor, is a microphone type sensor that detects ping or pre-ignition noise so that the ignition timing can be retarded while the camshaft position sensor, senses rotation of engine camshaft for speed and timing of injection whereas the throttle position sensor, senses the movement of the throttle plate so that the mixture flow can be adjusted for engine speed and acceleration while the manifold pressure sensor, monitors vacuum in the engine intake manifold so that the mixture strength can be adjusted with changes in engine load.