Subtopic: Power efficiencies and measurement, engine performance curves
Question Statement:
As per ASAE standards, the diameter of 1000 rpm-PTO shaft with 20 splines is
Options:
(A) 30 mm
(B) 35 mm
(C) 40 mm
(D) 45 mm
Official Answer Key:
D
Step-by-Step Solution & Explanation
ASAE/SAE PTO shaft standards specify three common speeds (540, 1000 rpm) with defined spline counts and diameters. The 1000-rpm, 20-spline PTO shaft is standardised at 45 mm nominal diameter (as opposed to the 1000-rpm 21-spline smaller-diameter shaft, or the 540-rpm 6-spline shaft) → option (D). This is a standards-recall item.
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