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EndsemNov 20252019 patternBE Mech

Dynamics of Machinery SPPU Endsem Question Paper Nov 2025

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 2025
Max. marks
70
Time
2½ Hours
Semester
VII
Paper code
[6584]-218

Printed for: B.E. (Mechanical)

Instructions to the candidates

  1. Answer 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 wherever necessary.

Questions

  1. Q1

    1. a)

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

      [9]
    2. b)

      Enlist elements of a vibratory system and explain with neat diagram mathematical modeling of a bicycle.

      Also asked:May 2025

      [8]

  2. Q2

    1. a)

      In a Single Degree of Freedom vibratory system, a suspended mass of 16 kg makes 30 oscillations in 22 seconds. The amplitude of oscillations decreases to 0.25 of initial value after 5 oscillations. Determine the i) Stiffness of the spring ii) Logarithmic decrement iii) Damping factor iv) Damping Coefficient

      [9]
    2. b)

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

      [8]

  3. Q3

    1. a)

      An electric motor running at 500 rpm is supported on a spring and a dashpot. The spring has the stiffness of 6400 N/m and dashpot offers a resistance of 400 N at 4.0 m/sec. The unbalanced mass of 0.6 kg rotates at 5 cm radius and the total mass of vibratory body is 16 kg. Calculate: i) Damping factor ii) Amplitude of vibration and phase angle iii) Resonant speed and resonant amplitude iv) Force exerted by spring and dashpot on motor v) Resultant force

      [10]
    2. b)

      Explain in detail with neat sketch forced vibration due to rotating unbalance.

      Also asked:May 2023

      [8]

  4. Q4

    1. a)

      A machine having mass of 200 kg is mounted on spring and damper. The total stiffness of spring is 7.84 × 10 5 N/m while damping ratio of damper is 0.15. A vertical harmonic force F = 392sin (314.15t) N acts on the machine. For the steady state vibrations of the system, Calculate, i) amplitude of vibration ii) the transmissibility iii) transmitted Force iv) phase difference between transmitted force and excited force

      [10]
    2. b)

      Explain quality factor and half power bandwidth.

      [8]

  5. Q5

    1. a)

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

      [10]
    2. b)

      Explain the concept of torsionally equivalent shaft and derive equation for its equivalent length. 3

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

      [7]

  6. Q6

    1. a)

      For the Spring mass system shown in Fig. 6 a), find Eigen values and Eigen vectors by matrix method

      [10]
    2. b)

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

      Also asked:May 2025 ·Nov 2023

      [7]

  7. Q7

    1. a)

      Explain time domain and frequency domain techniques for vibration monitoring.

      [10]
    2. b)

      List the vibration measuring instruments. Explain any one in detail.

      Also asked:Nov 2024 ·Nov 2022

      [8]

  8. Q8

    1. a)

      Explain in detail various types of sound filed in the vicinity of a sound source.

      [10]
    2. b)

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

      [8]