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EndsemNov 20232019 patternBE Mech

Dynamics of Machinery SPPU Endsem Question Paper Nov 2023

All 8 questions from this SPPU endsem paper, as printed. Read them here or open the PDF.

Open the PDFMost repeated Dynamics of Machinery questions
Subject code
402042
Pattern
2019 pattern
Exam
Endsem
Session
Nov 2023
Max. marks
70
Time
2½ Hours
Semester
VII
Paper code
[6181]-232

Printed for: B.E. (Mechanical)

Instructions to the candidates

  1. Attempt Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8.
  2. Neat diagrams must be drawn wherever necessary.
  3. Figures to the right indicate full marks.
  4. Assume Suitable data if necessary.

Questions

  1. Q1

    1. a)

      Determine the natural frequency of the mass ‘m’ placed at one end of a cantilever beam of negligible mass as shown in fig. 1a.

      [5]
    2. b)

      Explain with neat diagram mathematical model of a motorbike.

      [6]
    3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [6]

  2. Q2

    1. a)

      Define the term damping factor and explain with neat sketches, underdamped, overdamped and critically damped systems.

      Also asked:May 2025

      [8]
    2. b)

      An under-damped shock absorber is to be designed for a motorcycle of mass 200 kg such that during a road bump, the damped period of vibration is limited to 2 second and amplitude of vibration should reduce to one- sixteenth in one cycle. Find the spring stiffiness and the damping coefficient of shock absorber.

      Also asked:May 2025

      [9]

  3. Q3

    1. a)

      Derive an expression for the amplitude of vibration for a system having rotating or reciprocating unbalance.

      Also asked:May 2025

      [8]
    2. b)

      A machine part of mass 4 kg vibrates in a viscous fluid. Determine the damping coefficient when a harmonic exciting force of 50 N results in resonant amplitude of 250 mm with a period of 0.4 second. If the excitation frequency is 2 Hz, find the percentage increase in the amplitude of forced vibration when damper is removed.

      Also asked:May 2025

      [10]

  4. Q4

    1. a)

      A radio set of 20 kg mass has to be isolated from a machine vibrating with an amplitude of 0.05 mm at a speed of 500 cpm. The set is mounted on four isolators, each having a spring scale of 31400N/m and damping coefficient of 392 N-s/m. Determine i) Amplitude of vibration of radio set ii) Dynamic load on each isolator due to vibration.

      Also asked:May 2025

      [10]
    2. b)

      Derive an expression for deflection of vertical shaft with a single rotor without damping.

      Also asked:May 2025 ·May 2024

      [8]

  5. Q5

    1. a)

      Explain the concept of torsionally equivalent shaft and derive equation for its equivalent length.

      Also asked:Nov 2025 ·May 2025 ·Nov 2024 ·May 2024 ·May 2023 ·Nov 2022

      [7]
    2. b)

      Determine the natural frequency and corresponding mode shapes of given system shown in Fig. 5b when K = 40N/m and m = 10kg. 3

      [10]

  6. Q6

    1. a)

      Explain the torsional vibrations of geared system neglecting inertia of gears.

      Also asked:Nov 2025 ·May 2025

      [7]
    2. b)

      For a spring-mass system shown in Fig. 6b, find Eigen values and Eigen vectors by matrix method.

      [10]

  7. Q7

    1. a)

      What is FFT analyzer? Explain the importance of frequency spectrum for machinery fault detection.

      [10]
    2. b)

      Explain the process of vibration measurement with neat sketch.

      [8]

  8. Q8

    1. a)

      What are different methods of vibration control? Explain any one in detail.

      Also asked:May 2025

      [6]
    2. b)

      Explain with neat sketch the working of sound level meter.

      Also asked:May 2025 ·May 2023

      [6]
    3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [6]