Magnification factor is the ratio of ______

Which of the following conditions should be satisfied for static balancing? 1. Dynamic forces acting on the system should be zero 2. Couple acting on the system due to dynamic force should be zero 3. Centrifugal forces acting on the system should be zero 4. Couple acting on the system due to centrifugal forces should be zero

A. Condition 1 and condition 2

B. Condition 1 and condition 3

C. Condition 3 and condition 4

D. All of the above

Which of the following factors are not responsible for unbalancing in rotating systems?

A. Errors

B. Tolerances

C. Shape of the rotor

D. None of the above

Determine magnitude of balancing mass required if 250 mm is the radius of rotation. Masses of A, B and C are 300 kg, 250 kg and 100 kg which have radii of rotation as 50 mm, 80 mm and 100 mm respectively . The angles between the consecutive masses are 110° and 270° respectively.

A. 45.36 kg

B. 47.98 kg

C. 40.50 kg

D. None of the above

What are discrete parameter systems?

A. Systems which have infinite number of degree of freedom

B. Systems which have finite number of degree of freedom

C. Systems which have no degree of freedom

D. None of the above

In which type of vibrations, amplitude of vibration goes on decreasing every cycle?

A. Damped vibrations

B. Undamped vibrations

C. Both a. and b.

D. None of the above