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Theory of Machine

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

None of these
Minimum
Maximum
Zero

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Theory of Machine
In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

To start the locomotive quickly
Have perfect balancing
Minimize the effect of primary forces
Minimize the effect of secondary forces

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Theory of Machine
In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is

Greater than 2
Equal to 1
Equal to 2
Less than 2

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Theory of Machine
The velocity of sliding of meshing gear teeth is(Where ω₁ and ω₂ are angular velocities of meshing gears and ‘y’ is distance between point of contact and the pitch point)

(ω₁ + ω₂)/y
(ω₁ × ω₂) y
(ω₁/ω₂) y
(ω₁ + ω₂) y

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Theory of Machine
Whitworth quick return mechanism is obtained by inversion of

Slider crank mechanism
Roller cam mechanism
Five link mechanism
Kinematic chain

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Theory of Machine
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

α = 90° - φ
α = 90° + φ
α = 45° + φ/2
α = 45° - φ/2

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