Machine Design
The bearing characteristic number in a hydrodynamic bearing depends upon

Viscosity, speed and bearing pressure
Length, width and speed
Length, width and load
Viscosity, speed and load

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

Both (A) and (B)
The efficiency of a self locking screw can not be more than 50%
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

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