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Theory of Machine

Theory of Machine
Module of a gear is

2D/T
2T/D
T/D
D/T

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Theory of Machine
In order to balance the reciprocating masses,

Secondary forces and couples must be balanced
None of these
Both (A) and (B)
Primary forces and couples must be balanced

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Theory of Machine
The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is

Fc = ar
Fc = ar - b
Fc = ar + b
Fc = a/r + b

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Theory of Machine
In a flat collar pivot bearing, the moment due to friction is proportional to

(r₁² - r₂²)/(r₁ + r₂)
(r₁³ - r₂³)/(r₁ - r₂)
(r₁³ - r₂³)/(r₁² - r₂²)
(r₁² - r₂²)/(r₁ - r₂)

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Theory of Machine
If the opposite links of a four bar linkage are equal, the links will always form a

Triangle
Pentagon
Parallelogram
Rectangle

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Theory of Machine
In S.H.M., the velocity vector w.r.t. displacement vector

Lags by 90°
Leads by 90°
Leads by 180°
Are in phase

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