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Machine Design

Machine Design
Ball bearing type screws are found in following application

Crane
Steering mechanism
Aeroplane engines
Screw jack

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Machine Design
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

One-fourth
One-third
Double
One-half

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Machine Design
The property of a bearing material which has the ability to accommodate shaft deflections and bearing inaccuracies by plastic deformation without excessive wear and heating, is known as

Embeddability
Fatigue strength
Comformability
Bondability

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Machine Design
The groove angle of pulleys for V-belt is

420 to 450
More than 400
340 to 360
300 to 320

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Machine Design
For crank shaft bearings, the ratio of the length of the journal to its diameter is_________.

None of these
Less than unity
Greater than unity
Equal to 1

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

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

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