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Theory of Machine

Theory of Machine
A mechanism _________ for transmitting or transforming motion.

None of these
Unpredictable
Can not be used
Can be used

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Theory of Machine
Which gear is used for connecting two coplanar and intersecting shafts?

Helical gear
Spur gear
Bevel gear
None of these

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Theory of Machine
The maximum efficiency of spiral gears is (where θ = Shaft angle, and φ = Friction angle)

cos (θ + φ) + 1/ cos (θ - φ) + 1
cos (θ - φ) + 1/ cos (θ + φ) + 1
sin (θ + φ) + 1/ cos (θ - φ) + 1
cos (θ - φ) + 1/ sin (θ + φ) + 1

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Theory of Machine
A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having I 40 kg m2. The resultant speed after ing will be

100 RPM
90 RPM
80 RPM
data are insufficient

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Theory of Machine
In an open pair, the two elements of a pair

Have a surface contact when in motion
Are kept in contact by the action of external forces, when in motion
Have a line or point contact when in motion
Are not held together mechanically

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Theory of Machine
When the sleeve of a Porter governor moves upwards, the governor speed

Remain unaffected
Decreases
Increases
First increases and then decreases

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