Test: CAM & Balancing of Rigid Rotors & Field Balancing - 1 - Mechanical Engineering MCQ

What is the condition for dynamic balancing of a shaft-rotor system?

[IES 2007]

For a spring-loaded roller-follower driven with a disc cam,  

A system in dynamic balance implies that   

In a cam design, the rise motion is given by a simple harmonic motion (SHM) where h is total rise, θ is camshaft angle, β is the total angle of the rise interval. The jerk is given by

A rigid body shown in the Fig. (a) has a mass of 10 kg. It rotates with a uniform angular velocity 'ω'. A balancing mass of 20 kg is attached as shown in Fig. (b). The percentage increase in mass moment of inertia as a result of this addition is

The profile of a cam in a particular zone is given by x normal to the cam profile at  is at an angle (with respect to x axis) 

Assertion (A): A dynamically balanced system of multiple rotors on a shaft can rotate smoothly at the critical speeds of the system.

Reason (R): Dynamic balancing eliminates all the unbalanced forces and couples from the system. 

In a circular arc cam with roller follower, the acceleration in any position of the lift would depend only upon 

Consider the following statements for completely balancing a single rotating mass:        

1. Another rotating mass placed diametrically opposite in the same plane balances the unbalanced mass.
2. Another rotating mass placed diametrically opposite in a parallel plane balances the unbalanced mass.
3. Two masses placed in two different parallel planes balance the unbalanced mass.
Which of the above statements is/are correct?  

Consider the following statements:

Cam followers are generally classified according to
1. the nature of its motion
2. the nature of its surface in contact with the cam
3. the speed of the cam Which of the statements given above are correct? 

A system of masses rotating in different parallel planes is in dynamic balance if the resultant. 

In a single spindle automatic lathe two tools are mounted on the turret, one form tool on the front slide and the other, a parting tool on the rear slide. The parting tool operation is much longer than form tool operation and they operate simultaneously (overlap). The number of cams required for this job is