GATE ME 2014 Set 3 | Vibrations Question 29 | Theory of Machines

GATE ME 2014 Set 3

MCQ (Single Correct Answer)

-0.3

Consider a single degree-of-freedom system with viscous damping excited by a harmonic force. At resonance, the phase angle (in degree) of the displacement with respect to the exciting force is

$$0$$

$$45$$

$$90$$

$$135$$

GATE ME 2014

MCQ (Single Correct Answer)

-0.3

Critical damping is the

largest amount of damping for which no oscillation occurs in free vibration

smallest amount of damping for which no oscillation occurs in free vibration

largest amount of damping for which the motion is simple harmonic in free vibration

smallest amount of damping for which the motion is simple harmonic in free vibration

GATE ME 2014

MCQ (Single Correct Answer)

-0.3

In vibration isolation, which one of the following statements is NOT correct regarding Transmissibility ($$T$$)?

$$T$$ is nearly unity at small excitation frequencies

$$T$$ can be always reduced by using higher damping at any excitation frequency

$$T$$ is unity at the frequency ratio of $$\sqrt 2 $$

$$T$$ is infinity at resonance for undamped systems

GATE ME 2013

MCQ (Single Correct Answer)

-0.3

If two nodes are observed at a frequency of $$1800$$ rpm during whirling of a simply supported long slender rotating shaft, the first critical speed of the shaft in rpm is

$$200$$

$$450$$

$$600$$

$$900$$

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