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Machine Design

Machine Design
Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be

2
16
8
4

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

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Machine Design
When spring index increases, the value of Wahl's stress factor

Remains same
Decreases linearly
Increases exponentially
Increases linearly

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Machine Design
In nitrated parts, the origins of the fatigue cracks will occur at

Within the core
None of these
Surface
Just below the surface

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Machine Design
The wear load should be __________ the dynamic load.

None of these
Greater than
Equal to
Less than

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Machine Design
Rankine's theory is used for

Elastic materials
Plastic materials
Ductile materials
Brittle materials

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