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Theory of Machine

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

2π/ω
π/ω
ω/2π
ω × 2π

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Theory of Machine
A spring controlled governor is found unstable. It can be made stable by

Decreasing the ball mass
Increasing the spring stiffness
Increasing the ball mass
Decreasing the spring stiffness

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Theory of Machine
Which of the following mechanism is an approximate straight line motion mechanism?

Watt's mechanism
Robert's mechanism
Grasshopper mechanism
All of these

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Theory of Machine
The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as

None of these
Incompletely constrained motion
Successfully constrained motion
Completely constrained motion

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Theory of Machine
The relation between number of links (l) and number of joints (j) in a kinematic chain is

l = (2/3).(j + 2)
l = (1/2).(j + 2)
l = j + 4
l = (3/4).(j + 3)

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Theory of Machine
The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is

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

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