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Machine Design

Machine Design
A cotter joint is used to connect two __________ rods.

None of these
Co-axial
Parallel
Perpendicular

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

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Machine Design
The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is

1
4
2
43832

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Machine Design
A shaft coupling should

All of these
Be easy to connect or disconnect
Hold the shafts in perfect alignment
Transmit full power of the shaft

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Machine Design
In order to obtain bolt of uniform strength

Increase shank diameter
Tighten die bolt properly
Increase its length
Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread

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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)

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

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