1
GATE ME 2015 Set 1
Numerical
+2
-0
A precision instrument package (m = 1kg) needs to be mounted on a surface vibrating at 60 Hz. It is desired that only 5% of the base surface vibration amplitude be transmitted to the instrument. Assume that the isolation is designed with its natural frequency significantly lesser than 60Hz, so that the effect of damping may be ignored. The stiffness (in N/m) of the required mounting pad is _____________.
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2
GATE ME 2015 Set 1
MCQ (Single Correct Answer)
+2
-0.6
Considering massless rigid rod and small oscillations, the natural frequency (in rad/s) of vibration of the system shown in the figure is GATE ME 2015 Set 1 Theory of Machines - Vibrations Question 25 English
A
$$\sqrt {{{400} \over 1}} $$
B
$$\sqrt {{{400} \over 2}} $$
C
$$\sqrt {{{400} \over 3}} $$
D
$$\sqrt {{{400} \over 4}} $$
3
GATE ME 2014 Set 4
Numerical
+2
-0
A single degree of freedom system has a mass of 2kg, stiffness 8 N/m and viscous damping ratio 0.02. The dynamic magnification factor at an excitation frequency of 1.5 rad/s is ___________
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4
GATE ME 2014 Set 3
Numerical
+2
-0
A mass-spring-dashpot system with mass m = 10 kg, spring constant k = 6250 N/m is excited by a harmonic excitation of 10 cos(25t) N. At the steady state, the vibration amplitude of the mass is 40mm. The damping coefficient (c, in N.s/m) of the dashpot is ______________ GATE ME 2014 Set 3 Theory of Machines - Vibrations Question 27 English
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