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Machine Design

Machine Design
The static tooth load should be __________ the dynamic load.

Equal to
Less than
Greater than
None of these

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Machine Design
The ratio of pitch circle diameter in millimeters to the number of teeth, is called

None of these
Circular pitch
Module
Diametral pitch

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Machine Design
Buttress threads are usually found on

Railway carriage couplings
Screw cutting lathes
Feed mechanisms
Spindles of bench vices

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Machine Design
The shear stress in a beam varies from zero at the outer fibers to a maximum at the________.

Upper surface
Lower surface
None of these
Neutral surface

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given by Where m = mass of belt per meter (kg/m) v = belt velocity (m/s) f = coefficient of friction a = angle of wrap (radians)

(P1 - mv²)/ (P2 - mv²) = eᶠα
P1 / P2 = eᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα
P1 / P2 = e–ᶠα

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Machine Design
The ball bearings are provided with a cage

To maintain the balls at a fixed distance apart
To facilitate slipping of balls
To prevent the lubricant from flowing out
To reduce friction

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