288. The rate of decay of oscillations is known as
A.Critical damping
B.Damping coefficiera
C.Transmissibility
D.Logarithmic decrement

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289. In forced vibrations the magnitude of damping force at resonance equals
A.Inertia force
B.Impressed force
C.Infinity
D.Spring force

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290. In steady state forced vibrations, the amplitude of vibrations at resonance is
A.Directly proportional to the damping coefficient
B.Directly proportional to the resonant frequency
C.Inversely proportional to the damping coefficient
D.Inversely proportional to the resonant frequency

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291. The ratio of the maximum displacement of the forced vibration to the deflection due to the static force is called
A.Logarithmic decrement
B.Damping coefficient
C.Critical damping coefficient
D.Magnification factor

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292. The ratio of the actual damping coefficient to the critical damping coefficient is called
A.Magnification factor
B.Damping factor
C.Logarithmic decrement
D.Transmissibility

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293. For steady state forced vibrations, the phase lag nt resonance condition is
A.0?
B.45?
C.90
D.180?.

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294. A rotary system having damping coefficient of 50N sec m/rad, when twisted with an angular velocity of 2 rad/sec will experience the damping torque of
A.50 Nm
B.100 Nm
C.25 Nm
D.200 Nm

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