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Theory of Machine

Theory of Machine
In S.H.M., the velocity vector w.r.t. displacement vector

Leads by 90°
Lags by 90°
Leads by 180°
Are in phase

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Theory of Machine
The mechanism consisting of three turning pairs and one sliding pair, is called a

Whitworth quick return motion mechanism
Crank and slotted lever quick return motion mechanism
All of these
Single slider crank chain

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Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

(r/2) cosφ
r cosφ
r sinφ
r tanφ

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Theory of Machine
A kinematic chain is known as a mechanism when

None of these
None of the links is fixed
One of the links is fixed
Two of the links are fixed

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Theory of Machine
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2.22 mm
2 mm
2.50 mm
3.0 mm

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

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

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