NEIEP Mechanics Practice Exam

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Prepare for the NEIEP Mechanics Exam with multiple choice questions, hints, and detailed explanations. Ace your test and advance your career!

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For a two-speed AC motor with an 8:1 ratio and a rated speed of 225 FPM, what is the leveling speed?

15 FPM
20 FPM
28 FPM
30 FPM

The correct answer is: 28 FPM

To determine the leveling speed for a two-speed AC motor with an 8:1 ratio and a rated speed of 225 feet per minute (FPM), it's important to understand how the motor operates at its different speed settings. The motor has a high speed at 225 FPM, and given its 8:1 ratio, this implies that the lower speed can be calculated by dividing the high speed by 8. Thus, the leveling speed can be computed as follows: Leveling speed = High speed / Speed ratio In this case, that would be: Leveling speed = 225 FPM / 8 = 28.125 FPM Rounding this value gives approximately 28 FPM, which aligns with the choice provided. Understanding that the leveling speed corresponds to the lower RPM output of the motor at the reduced speed setting clarifies why the answer is effectively 28 FPM. This illustrates the relationship between motor speed settings and operational efficiencies in applications needing variable speeds, such as conveyors or hoists.