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1. Viscous damping system: amplitude after 6 cycles is 0.125 of initial. Ratio after 4 cycles?

A

0.125

B

0.25

C

0.50

D

0.75

2. Under logarithmic decrement, the amplitude of successive vibrations are

A

Constant

B

In arithmetic progression

C

In geometric progression

D

In logarithmic progression

3. Oscillation of decreasing amplitude with time is damped oscillation. Oscillation under periodic force is forced oscillation. Choose correct.

A

1 correct, 2 incorrect

B

2 correct, 1 incorrect

C

Both correct

D

Both incorrect