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Theory of Machine

Theory of Machine
A higher pair has__________.

None of these
Surface contact
No contact
Point contact

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Theory of Machine
Rectangular bar in a rectangular hole is the following type of pair

Partially constrained motion
Completely constrained motion
Freely constrained motion
Incompletely constrained motion

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Theory of Machine
Klein's construction is useful to determine

Displacement of various parts
Angular acceleration of various parts
Acceleration of various parts
Velocity of various parts

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Theory of Machine
A foot step bearing and rotor of a vertical turbine form examples of

Successfully constrained motion
Partially constrained motion
Incompletely constrained motion
Completely 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 cos(α + φ)
P = W tan(α + φ)
P = W tan(α - φ)
P = W tan(φ - α)

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Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

(ω₁ - ω₂)r
ω₁.ω₂.r
(ω₁ - ω₂)2r
(ω₁ + ω₂)r

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