Machine Design
Two helical springs of the same material and of equal circular cross-section, length and number of turns, but having radii 80 mm and 40 mm, kept concentrically (smaller radius spring within the larger radius spring), are compressed between two parallel planes with a load W. The inner spring will carry a load equal to

W/2
W/9
8W/9
2W/3

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Machine Design
When the belt is transmitting maximum power,

The tension in slack side is equal to the centrifugal tension
The tension in tight side is twice the centrifugal tension
None of these
The tension in tight side is thrice the centrifugal tension

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Machine Design
The contact ratio is the ratio of

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

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