Theory of machines - Section 1 (2)

A pair of friction discs is an example of rolling pair.

The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

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

The static friction

When a particle moves round the circumference of a circle of radius r with ω rad/s, then its maximum acceleration is ω²r.

The sliding pairs, turning pairs and screw pairs form lower pairs.

The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow.