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Theory of Machine

Theory of Machine
Which of the following mechanism is obtained from lower pair?

All of these
Valve and valve gears
Gyroscope
Pantograph

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

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Theory of Machine
In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

Could change or remain unaltered depending on which link is fixed
Will remain same
Will not occur
Will change

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Theory of Machine
The example of spherical pair is

Bolt and nut
Ball and socket joint
Lead screw of a lathe
Ball bearing and roller bearing

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

ω × 2π
ω/2π
π/ω
2π/ω

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Theory of Machine
Whitworth quick return mechanism is obtained by inversion of

Roller cam mechanism
Five link mechanism
Slider crank mechanism
Kinematic chain

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