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Machine Design

Machine Design
In a full journal bearing, the angle of contact of the bearing with the journal is

120°
270°
360°
180°

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Machine Design
When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

One-fourth
Double
Same
One-half

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Machine Design
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon

0.35 to 0.45%
0.20 to 0.40%
None of these
0.40 to 0.60%

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Machine Design
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

Ensure uniform loading
Reduce slip
Reduce vibration
Ensure proper alignment

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Machine Design
In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

2 d
2.5 d
1.5 d
1 d

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Machine Design
If T is the actual number of teeth on a helical gear and φ is the helix angle for the teeth, then formative number of teeth is written as

T sec³φ
T/sec³φ
T cosecφ
T sec²φ

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