1
GATE ME 2015 Set 2
+2
-0.6
A single-degree-freedom spring mass system is subjected to a sinusoidal force of $$10$$ N amplitude and frequency $$\omega$$ along the axis of the spring. The stiffness of the spring is $$150$$N/m, damping factor is $$0.2$$ and the undamped natural frequency is $$10$$$$\omega$$. At steady state, the amplitude of vibration (in m) is approximately
A
$$0.05$$
B
$$0.07$$
C
$$0.70$$
D
$$0.90$$
2
GATE ME 2015 Set 1
+2
-0.6
A mobile phone has a small motor with an eccentric mass used for vibrator mode. The location of the eccentric mass on motor with respect to center of gravity $$(CG)$$ of the mobile and the rest of the dimensions of the mobile phone are shown. The mobile is kept on a flat horizontal surface.

Given in addition that the eccentric mass = $$2$$ grams, eccentricity = $$2.19$$ mm, mass of the mobile = $$90$$ grams, g = $$9.81$$ $$m/{s^2}.$$ Uniform speed of the motor in $$RPM$$ for which the mobile will get just lifted off the ground at the end $$Q$$ is approximately

A
$$3000$$
B
$$3500$$
C
$$4000$$
D
$$4500$$
3
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 _____________.
4
GATE ME 2015 Set 1
+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
A
$$\sqrt {{{400} \over 1}}$$
B
$$\sqrt {{{400} \over 2}}$$
C
$$\sqrt {{{400} \over 3}}$$
D
$$\sqrt {{{400} \over 4}}$$
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