Theory of machines Questions

• The frictional torque transmitted in a multi-collared shaft is same as that of a single collared shaft.
• In under damped vibrating system, the amplitude of vibration
• A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is
• 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)
• The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is
• 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 pressure angle of a cam is the angle between the direction of the follower motion and a normal to the
• A pair of friction discs is an example of rolling pair.
• The sliding pairs, turning pairs and screw pairs form lower pairs.
• The two elements of a pair are said to form a __________ when they permit relative motion between them.