Machine Design
When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent twisting moment is equal to

M + √(M² + T²)
(1/2) × [M + √(M² + T²)]
√(M² + T²)
(1/2) × √(M² + T²)

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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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