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Machine Design

Machine Design
The included angle in unified of American National threads is

47°
29°
60°
55°

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Machine Design
Wahl's stress factor __________ very rapidly as the spring index decreases.

Remain same
Decreases
Increases
None of these

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Machine Design
The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to(Where, Pc = tension in belt due to centrifugal force)

Pc/3
3 Pc
1 Pc
2 Pc

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Machine Design
A steel containing up to 0.15% carbon is known as

Dead mild steel
Medium carbon steel
Mild steel
High carbon steel

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Machine Design
When a shaft is subjected to combined twisting moment (T) and bending moment (M), then the equivalent twisting moment is equal to

(1/2) × [M + √(M² + T²)]
M + √(M² + T²)
√(M² + T²)
(1/2) × √(M² + T²)

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Machine Design
In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called

Normal pitch
Axial pitch
Module
Diametral pitch

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