Machine Design
In block brakes, the ratio of shoe width to wheel diameter is taken between

0.25 and 0.50
0.1 and 0.25
0.50 and 0.75
0.75 and 1

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Machine Design
In worm, gears, pitch lead angle is

None of these
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and the plane of rotation
The angle between the tangent to the pitch helix and an element of the cylinder

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Machine Design
Spring stiffness is

Ratio of coil diameter to wire diameter
Its capability of storing energy
Load required to produce unit deflection
Its ability to absorb shocks

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

Belts are available in sets
Only one belt cannot be fitted with other used belts
The new belt will carry more than its share and result in short life
New and old belts will cause vibrations

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