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Theory of Machine

Theory of Machine
For an involute gear, the ratio of base circle radius and pitch circle radius is equal to

cosφ
secφ
sinφ
cosecφ

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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

90 RPM
100 RPM
data are insufficient
80 RPM

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Theory of Machine
To connect two parallel and coplanar shafts the following type of gearing is used

Spur gear
Spiral gear
None of the listed here
Bevel gear

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Theory of Machine
If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

0°
180°
90°
360°

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Theory of Machine
The unbalanced primary forces in a reciprocating engine are

Balanced completely
Balanced by secondary forces
Balanced partially
Not balanced

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Theory of Machine
In multi V-belt transmission, if one of the belt is broken, we have to change the

Broken belt and its adjacent belts
All the belts
Broken belt
There is no need of changing any one as remaining belts can take care of transmission of load

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