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Theory of Machine

Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

30
15
8
28

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Theory of Machine
The unbalanced force due to reciprocating masses

Varies in direction but constant in magnitude
Varies in magnitude but constant in direction
Constant in magnitude and direction both
Varies in magnitude and direction both

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Theory of Machine
The periodic time is given by (where ω = Angular velocity of the particle in rad/s)

π/ω
ω × 2π
2π/ω
ω/2π

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Theory of Machine
One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)

2π. √(g/δ)
2π. √(δ/g)
1/2π. √(δ/g)
1/2π. √(g/δ)

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Theory of Machine
For a kinematic chain to be considered as mechanism

Two links should be fixed
None of the links should be fixed
There is no such criterion
One link should be fixed

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Theory of Machine
In a screw jack, the effort required to lower the load W is given by

P = W cos(α + φ)
P = W tan(α - φ)
P = W tan(α + φ)
P = W tan(φ - α)

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