Machine Design
The dedendum is the radial distance from the

Pitch circle to the top of a tooth
Pitch circle to the bottom of a tooth
Top of a tooth to the bottom of a tooth
Addendum circle to the clearance circle

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Machine Design
Which of the following statement is correct regarding power screws?

If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
The efficiency of a self locking screw can not be more than 50%
Both (A) and (B)
The efficiency of Acme (trapezoidal) thread is less than that of a square thread

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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Obtain variable moment of inertia (I) in each leaf
Have variable bending moment (M) in each leaf
Make M/I constant throughout the length of the leaf
Permit each leaf to act as an overhanging beam

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