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Theory of Machine

Theory of Machine
The type of gears used to connect two non parallel and non intersecting shafts is

Spur gear
Spiral gear
Bevel gear
Helical gear

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Theory of Machine
When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than

0.5
1
2
0.25

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

Can be used
Can not be used
None of these
Unpredictable

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Theory of Machine
A system in dynamic balance implies that

The system is also statically balanced
There will absolutely no wear of bearings
There is no critical speed in the system
The system is critically damped

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Theory of Machine
The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

l₂ = kG
l₁ = kG
l₁l₂ = kG
l₁l₂ = kG²

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Theory of Machine
The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.

Same
None of these
Unpredictable
Different

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