Machine Design
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

Pressure angle
Helix angle
Pitch lead angle
None of these

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Machine Design
Stress concentration is caused due to

Pitting at points or areas at which loads on a member are applied
All of these
Variation in properties of material from point to point in a member
Abrupt change of section

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

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

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