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Theory of Machine

Theory of Machine
In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

0.2
0.6
0.8
0.4

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Theory of Machine
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

m₁ r₂ = m₂ r₁
m₁ r₁ = m₂ r₂
None of these
m₁ m₂ = r₁ r₂

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Theory of Machine
Which of the following is an inversion of Single slider crank chain?

Oldham’s coupling
Rotary engine
Beam engine
Elliptical trammel

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Theory of Machine
A circular bar moving in a round hole is an example of

Incompletely constrained motion
Partially constrained motion
Completely constrained motion
Successfully constrained motion

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

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

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Theory of Machine
The two elements of a pair are said to form a _________ when they permit relative motion between them.

Sliding pair
None of these
Kinematic pair
Open pair

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