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Machine Design

Machine Design
The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

24
18
12
14

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (2a/b)]
σ [1 + (3a/b)]
σ [1 + (b/3a)]
σ [1 + (b/2a)]

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Machine Design
The process extensively used for making bolts and nuts is

Cold peening
Extrusion
Cold heading
Hot piercing

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Machine Design
A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm². If the permissible tensile stress in the metal is 20 N/mm², then the thickness of the metal required for making the pipe will be

5 mm
10 mm
15 mm
25 mm

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Machine Design
A screw will be self locking, if

Friction angle is equal to helix angle
Friction angle is less than helix angle
Friction angle is more than helix angle
Efficiency of screw is 100%

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)

⅟₂ × (P1 + P2)
P1 + P2
[⅟₂ × (P1 + P2)] + Pc
P1 - P2

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