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Machine Design

Machine Design
The allowable static stress for steel gears is approximately __________ of the ultimate tensile stress.

Double
One-fourth
One-third
One-half

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Machine Design
Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

F
F.P
P
F + P

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Machine Design
The connecting rod bolts are tightened up so that tightening stress

Approaches yield point
Is just sufficient to hold parts together
Is 50% of yield point
Is about yield point divided by safety factor

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Machine Design
In a butt welded joint, the size of weld is __________ the throat of weld.

Equal to
Double
0.5 times
2 times

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Machine Design
The stress induced in the belt is,

Compressive stress
Direct shear stress
Tensile stress
Torsional shear stress

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

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

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