1
GATE ME 2006
+2
-0.6
A machine of $$250$$ kg mass is supported on springs of total stiffness $$100$$ kN/m. Machine has an unbalanced rotating force of $$350$$ N at speed of $$3600$$ rpm. Assuming a damping factor of $$0.15,$$ the value of transmissibility ratio is
A
$$0.0531$$
B
$$0.9922$$
C
$$0.0162$$
D
$$0.0028$$
2
GATE ME 2006
+2
-0.6
A vibratory system consists of a mass $$12.5$$ kg, a spring of stiffness $$1000$$ $$N/m,$$ and a dashpot with damping coefficient of $$15$$ $$Ns/m.$$

The value of logarithmic decrement is

A
$$1.35$$
B
$$0.42$$
C
$$0.68$$
D
$$0.66$$
3
GATE ME 2006
+2
-0.6
A vibratory system consists of a mass $$12.5$$ kg, a spring of stiffness $$1000$$ $$N/m,$$ and a dashpot with damping coefficient of $$15$$ $$Ns/m.$$

The value of critical damping of the system is:

A
$$0.223$$ $$Ns/m$$
B
$$17.88$$ $$Ns/m$$
C
$$71.4$$ $$Ns/m$$
D
$$223.6$$ $$Ns/m$$
4
GATE ME 2005
+2
-0.6
In a spring-mass system, the mass is 0.1 kg and the stiffness of the spring is 1 kN/m. By introducing a damper, the frequency of oscillation is found to be 90% of the original value. What is the damping coefficient of the damper?
A
1.2 N.s/m
B
3.4 N.s/m
C
8.7 N.s/m
D
12.0 N.s/m
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