Machine Design
A screw is said to be over hauling screw, if the

Friction angle is equal to helix angle
Efficiency of screw is 100%
Friction angle is less than helix angle
Friction angle is more than helix angle

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Machine Design
In oilness bearings

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

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Machine Design
When a belt drive is transmitting maximum power,

Driving tension on tight side is twice the centrifugal tension
Driving tension on slack side is equal to centrifugal tension
Effective tension is equal to centrifugal tension
Effective tension is half of centrifugal tension

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Machine Design
In composite or reverse laid ropes

Wires in two adjacent strands are twisted in opposite direction
Direction of twist of wires and strands are same
Direction of twist of wires in strands is opposite to the direction of twist of strands
Wires are not twisted

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Machine Design
Turn buckle has

Left hand threads on both ends
Left hand threads on one end and right hand threads on other end
No threads
Right hand threads on bout ends

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