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Essential Skills Manual - Automotive Service Technician

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ESSENTIAL SKILLS<br />

INVENTORY<br />

NUMERACY<br />

S-2<br />

Page 92<br />

AUTOMOTIVE SERVICE TECHNICIAN<br />

NOC 7321<br />

22. The torque strength of a shaft is proportional to the cube of the shaft<br />

diameters as shown:<br />

Strength of shaft 1 = (diameter of shaft 1) 3<br />

Strength of shaft 2 (diameter of shaft 2) 3<br />

How much stronger would a 1-inch diameter shaft be than one that is ½-inch<br />

in diameter?<br />

_____________8 times stronger_________________________________<br />

23. A 28-tooth gear running at 320 rpm drives another gear. The other gear runs<br />

at 128 rpm. How many teeth are on the other gear?<br />

____________The other gear has 70 teeth _________<br />

28 = 128 (indirect proportion)<br />

X 320<br />

24. What is the diameter of a hose that is 1 /16 inch larger than 2 5 /8 inches?<br />

______________2 11 /16”______________________________________<br />

<strong>Automotive</strong> <strong>Service</strong> <strong>Technician</strong><br />

NOC 7321

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