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The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

A. working depth
B. clearance
C. face width
D. backlash

Option D

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The load cup of a screw jack is made separate from the head of the spindle to A. enhance the load carrying capacity of the jack B. reduce the effort needed for lifting the working load C. prevent the rotation of load being lifted D. reduce the value of frictional torque	The radial distance of a tooth from the pitch circle to the top of the tooth is called A. dedendum B. addendum C. clearance D. working depth