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The largest change of output quantity for which there is no output of the instrument is the ____________

(a) dead time

(b) dead zone

(c) first order response

(d) none of the mentioned

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This intriguing question originated from Intake Air Flow Measurement topic in chapter Engine Electronics of IC Engine

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Answer: (b) dead zone

Explanation: The dead zone refers to the largest change in the input quantity (measurand) for which there is no output from the instrument. This happens when the system does not register small or insignificant changes in the measurand, essentially having a threshold below which the system remains unresponsive. It is a characteristic of some measurement systems where small variations in the input do not result in a measurable output.

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