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The lowest speed of engine at which the engine runs smoothly is called ________

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in Farm Machinery by (38.9k points)
The lowest speed of engine at which the engine runs smoothly is called ________

(a) at least speed

(b) threshold speed

(c) minimum speed

(d) idling speed

The question was posed to me during an online interview.

The question is from Working Principle of Battery Ignition System topic in portion Ignition and Power Transmission of Farm Machinery

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Right choice is (d) idling speed

Explanation: Idle speed is the rotational speed of an engine when the engine is idling. An engine is said to be idle when the engine is not coupled from its drivetrain and the pedal for throttling is not in a depressed position. Idle speed is usually measured in RPM (revolutions per minute). At this speed, the engine will be generating enough power to run smoothly but it won’t be sufficient to perform any useful work.

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