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THEORY OF MACHINE

Theory of Machine
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

45° and 225°
180° and 270°
270° and 360°
90° and 180°

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Theory of Machine
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

135° and 315°
90° and 180°
270° and 360°
0° and 90°

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Theory of Machine
Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

10
30
34
20

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Theory of Machine
In railway axle boxes, the bearing used is

Cylindrical roller bearing
Deep groove ball bearing
Double row self aligning ball bearing
Double row spherical roller bearing

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

Ensure uniform loading
Reduce vibration
Reduce slip
Ensure proper alignment

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