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

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

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Machine Design
According to Indian standard specifications, 100 H6/g5 means that

Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7
Tolerance grade for the shaft is 6 and for the hole is 5
Tolerance grade for the hole is 6 and for the shaft is 5
Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7

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Machine Design
Cap screws are

Slotted for a screw driver and generally used with a nut
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Provided with detachable caps
Used to prevent relative motion between parts

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