Machine Design
Stress concentration in cyclic loading is more serious in

Equally serious in both cases
Ductile materials
Depends on other factors
Brittle materials

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Machine Design
A fast and loose pulley drive is used when

Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the opposite directions

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Machine Design
In oilness bearings

The oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant
Grease required to be applied after some intervals
The oil film is maintained by supplying oil under pressure

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Machine Design
The contact ratio is the ratio of

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

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