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Machine Design

Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

67.5°
90°
22.5°
45°

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Machine Design
The largest diameter of an external or internal screw thread is known as

Pitch diameter
Major diameter
Minor diameter
None of these

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Machine Design
The expression 0.175 - 0.841/T is the Lewis form factor for

14½° composite and full depth involute system
20° stub system
20° full depth involute system
None of these

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Machine Design
Basic hole is one

Whose lower as well as upper deviations are zero
Does not exist
Whose upper deviation is zero
Whose lower deviation is zero

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Machine Design
A bolt is designed on the basis of __________ with a large factor of safety.

Direct compressive stress
Direct bending stress
Direct tensile stress
Direct shear stress

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Machine Design
For hardening alloy steels and high speed steels, they are heated to

1300 to 1500°C
500 to 600°C
1100 to 1300°C
700 to 900°C

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