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Theory of Machine

Theory of Machine
When a ship travels in a sea, which of the effect is more dangerous

Steering
Rolling
Pitching
All of these

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Theory of Machine
The ratio of height of Porter governor (when length of arms and links are equal) to the height of Watt's governor is (where m = Mass of the ball, and M = Mass on the sleeve)

(m + M)/M
m/(m + M)
(m + M)/m
M/(m + M)

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

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Theory of Machine
Sense of tangential acceleration of a link

Could be either same or opposite to velocity
Is same as that of velocity
Is opposite to that of velocity
Is perpendicular to that of velocity

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Theory of Machine
The height of a Watt's governor (in meters) is equal to (where N = Speed of the arm and ball about the spindle axis)

895/N²
8.95/N²
8950/N²
89.5/N²

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Theory of Machine
Bifilar suspension method is used to find the

Periodic time of the body
Angular acceleration of the body
Moment of inertia of the body
Frequency of vibration of the body

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