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Theory of Machine

Theory of Machine
Which of the following is an open pair?

Lead screw and nut
Journal bearing
Cam and follower
Ball and socket joint

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Theory of Machine
When the primary direct crank of a reciprocating engine makes an angle of 'θ' with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.

2θ
θ/2
θ
4θ

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

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Theory of Machine
In under damped vibrating system, the amplitude of vibration

Increases exponentially with time
Decreases linearly with time
Decreases exponentially with time
Increases linearly with time

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Theory of Machine
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO. The acceleration of the piston P with respect to the crank-pin C is given by

ω² × NO
ω² × CO
ω² × CN
ω² × QN

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Theory of Machine
The example of completely constrained motion is a

All of these
Motion of a shaft with collars at each end in a circular hole
Motion of a piston in the cylinder of a steam engine
Motion of a square bar in a square hole

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