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Machine Design

Machine Design
Ball bearing type screws are found in following application

Crane
Aeroplane engines
Screw jack
Steering mechanism

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Machine Design
For high speed engines, the cam follower should move with

Uniform acceleration and retardation
Uniform velocity
Simple harmonic motion
Cycloidal motion

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Machine Design
Euler’s formula for a mild steel column is not valid if the slenderness ratio is

100
60
90
120

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Machine Design
The resultant axial load on a bolt depends on

Relative elastic yielding (springness) of the bolt and the connected member
All of these
External load applied
Initial tension

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Machine Design
Which of the following screw thread is adopted for power transmission in either direction?

Acme threads
Multiple threads
Square threads
Buttress threads

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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/2a)]
σ [1 + (b/3a)]

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