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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

Option C

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A screw is said to be over hauling screw, if its efficiency is A. less than 50% B. more than 50% C. equal to 50% D. none of these	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