Machine Design
Lewis form factor for 14½° composite and full depth involute system is (where T = Number of teeth)

None of these
0.154 - (0.912/T)
0.124 - (0.684/T)
0.175 - (0.841/T)

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Machine Design
The effective stress in wire ropes during normal working is equal to the stress due to

Bending plus stress due to acceleration/retardation
Axial load plus stress due to bending
Axial load plus stress due to acceleration/retardation
Acceleration/retardation of masses plus stress due to bending

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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 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)

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