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Machine Design

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

One-third
One-half
Double
One-fourth

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Machine Design
Which of the following is not correct procedure to increase the fatigue limit?

Shot peening
Surface decarburisation
Cold working
Under stressing

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Machine Design
The included angle for the British Association thread is

60°
55°
47.3°
29°

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Machine Design
Which of the following statement is correct, for two shafts connected in parallel?

Angle of twist of each shaft is the same
Shear stress in each shaft is the same
Torsional stiffness of each shaft is the same
Torque in each shaft is the same

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Machine Design
The design of pin of a rocker arm of an I.C. engine is based on

Bearing failure
Bending failure
All of these
Shearing failure

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

180°
270°
120°
360°

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