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Machine Design

Machine Design
Rankine's theory of failure is applicable for following type of materials

Plastic
Brittle
Ductile
Elastic

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Machine Design
A self locking screw has

Course threads
Coefficient of friction is greater than tangent of load angle
Fine threads
Hole for inserting split pin

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Machine Design
The root angle of a bevel gear is equal to

Pitch angle + dedendum angle
Pitch angle - addendum angle
Pitch angle - dedendum angle
Pitch angle + addendum angle

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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 cosecφ
T sec²φ
T/sec³φ
T sec³φ

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Machine Design
For tight leakage joints, following type of thread is best suited

Buttress
NPT (national pipe threads).
Metric
Square

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Machine Design
According to maximum normal stress theory, the maximum normal stress in the shaft is

(1/2) × [σ + √(σ² × 4τ²)]
√(σ² × 4τ²)
σ + √(σ² × 4τ²)
(1/2) × √(σ² × 4τ²)

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