Dr.A.P.J.Abdul Kalam University BE VII SEM ALL BRANCH Mechanical Vibration & Noise Engineering [ME-703] Dec - 2020 Question Paper

Dr.A.P.J.Abdul Kalam University

Bachelor of Engineering

Seventh Semester Main Examination, Dec-2020

Mechanical Vibration & Noise Engineering [ME-703]

Branch: ME

Time: 3:00 Hrs Max Marks 70

Note : 1. Attempt any five questions out of eight.

           2. All question carry equal marks.

Q.1 (a) What are beats? How do you connect several springs to increase the

overall stiffness?

(b) What is the difference between deterministic and random vibration? Give two practical

example of each. What are the common types of damping?

Q.2 (a) Write short technical notes on "Industrial Noise Control" and "Auditory

Effect of Noise"?

(b) What is expansion theorem? What is its importance? Explain the modal analysis procedure.

Q.3 (a) What are the three elementary part of vibrating system? Define the

number of degree of freedom of vibrating system.

 (b) What are the practical applications of critical damping?

Q.4 (a) Discuss in brief, various types of damping.

 (b) What is magnification factor and how does it vary with frequency ratio?

Q.5 (a) What are the different isolating material and what are their applications?

 (b) Define "Principal mode of vibration"

Q.6 (a) What do you understand by "Semi definite system"?

(b) What is main disadvantage of dynamic vibration absorbers? What is a tuned vibration

absorber?

Q.7 What do you understand by under damped system, overdamped system and critically-damped

system? Explain.

Q.8 Write short note on following-

 i. Natural frequency of vibrations

 ii. Fundamental mode of vibrations

 iii. Degree of freedom of vibration system

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