Correct Answer: C
Explanation:
Explanation:
Both definitions are standard.
Correct Answered:
Wrong Answered:
1. 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
Both definitions are standard.
Correct Answered:
Wrong Answered:
2. Under logarithmic decrement, the amplitude of successive vibrations are
A
Constant
B
In arithmetic progression
C
In geometric progression
D
In logarithmic progression
Amplitude decays in geometric progression with each cycle in logarithmic decrement.
Correct Answered:
Wrong Answered:
3. 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
Decay ratio ~ geometric. From 6 cycles 0.125, at 4 cycles it`s 0.25 (option B). Correction: correct answer = 0.25.
Correct Answered:
Wrong Answered: