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Theory of Machine

Theory of Machine
A rigid body possesses ________degrees of freedom

One
Six
Two
Four

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Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

Slightly less than 45 mm
45 mm
Slightly more than 45 mm
95 mm

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Theory of Machine
Kinematic pairs are those which have two elements that

Are held together
Have surface contact
Have line contact
Permit relative motion

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Theory of Machine
In an open pair, the two elements of a pair

Are kept in contact by the action of external forces, when in motion
Have a surface contact when in motion
Are not held together mechanically
Have a line or point contact when in motion

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Theory of Machine
The velocity of a particle moving with simple harmonic motion, at any instant is given by (where ω = Displacement of the particle from mean position)

ω √(x² - r²)
ω √(r² - x²)
ω² √(r² - x²)
ω² √(x² - r²)

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Theory of Machine
When one of the links of a kinematic chain is fixed, the chain is known as a

Mechanism
Inversion
Machine
Structure

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