Machine Design
A shaft is subjected to

Combined bending and shear stresses
Bending stresses
All of these
Shear stresses

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

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

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Machine Design
The contact ratio is the ratio of

Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch
Length of arc of contact to the circular pitch
Length of path of contact to the circular pitch

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