11.
One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where $$\delta $$ = Deflection of the spring)

12.
In vibration isolation system, if $$\frac{\omega }{{\omega {\text{n}}}} < 2,$$  then for all values of damping factor, the transmissibility will be (where $$\omega $$ = Angular speed of the system, $$\omega {\text{n}}$$ = Natural frequency of vibration of the system)

14.
The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

15.
In a mechanism, the fixed instantaneous centers are those centers which

18.
The length of a simple pendulum which gives the same frequency as the compound pendulum, is

19.
For the brake to be self locking, the force P at C shown in the below figure, should
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