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Machine Design

Machine Design
In a marine flange coupling, the pitch circle diameter of bolts is taken as

2.5 d
1.6 d
2 d
1.2 d

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Machine Design
In the assembly of pulley, key and shaft

All the three are designed for equal strength
Key is made the strongest
Key is made the weakest
Pulley is made the weakest

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Machine Design
When the fulcrum is in between the load and effort, the lever is said to be of

Third type
Second type
Any one of these
First type

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Machine Design
The strap end of a connecting rod of steam engine is joined by

Gib of cotter joint
Sleeve and cotter joint
Knuckle joint
Spigot socket cotter joint

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Machine Design
The backlash for spur gears depends upon

Module
Tooth profile
Pitch line velocity
Both module and pitch line velocity

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

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