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Theory of Machine

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

Helical gear
Bevel gear
None of these
Spur gear

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Theory of Machine
When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

[(r + R) sinφ]/2
[(r + R) cosφ]/2
[(r² + R²) cosφ]/2
[(r² + R²) sinφ]/2

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Theory of Machine
The minimum force required to slide a body of weight W on a rough horizontal plane is

W cosecθ
W cosθ
W tanθ
W sinθ

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Theory of Machine
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.

None of these
Real
Complex conjugate
Equal

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Theory of Machine
In a pantograph, all the pairs are

Turning pairs
Sliding pairs
Self-closed pairs
Spherical pairs

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Theory of Machine
The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.

Maximum
Minimum
Zero
None of these

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