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MP Sub-Engineer ME: Vibrations Quiz 48

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Question 1

The frequency of oscillation is the number of cycles per unit time described by the particle, given by the relation __________.

Question 2

A vertical shaft of 100 mm diameter and 1 m length has its upper end fixed at the top. The other end carries a disc of 5000 N and the modulus of elasticity of the shaft material is 2

10⁵ N/mm². Neglecting the weight of the shaft, the frequency of the longitudinal vibrations will be nearly___.

Question 3

The accurate method of finding the natural frequency of transverse vibrations of a system of several loads attached to some shaft is

Question 4

The speed at which the shaft runs, so that the deflection of the shaft from the axis of rotation becomes infinite, is known as

Question 5

Which one of the following relations with usual notations will hold good in a dynamic vibration absorber system under tuned conditions?

Question 6

In a vibrating system the spring has stiffness 8 N/m and the mass is 2 kg. the system is having a damper whose damping coefficient of viscous damping is 8 N-s/m. The system is __________.

Question 7

The equation of motion for a single degree of freedom system is

The damping ratio for the system is(in N s/m)

Question 8

The mass of a single-degree damped vibrating system is 7.5 kg and it makes 24 free oscillations in 14 s when disturbed from its equilibrium position. The amplitude of vibration reduces to 0.25 of its initial value after five oscillations. Then the logarithmic decrement will be