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Which method infers engine load on a speed density system?

  • A.Throttle angle alone
  • B.The alpha-n method, in which throttle angle and engine speed together are used to estimate the charge admitted
  • C.Manifold pressure combined with speed and air temperature
  • D.The mass air flow sensor, which measures the air entering the engine directly and therefore reports the load

Answer: C

Speed density calculates the charge from manifold pressure, engine speed, displacement and temperature. Alpha-n genuinely is the third method and is used on engines with individual throttles, which makes the last option a real alternative strategy. Naming what changes and what stays the same is the reliable route through questions of this shape. The order in which the effects act is what decides the outcome, so it is worth establishing first. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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