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EndsemMay 20242019 patternBE Mech

Dynamics of Machinery SPPU Endsem Question Paper May 2024

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
May 2024
Max. marks
70
Time
2½ Hours
Semester
VII
Paper code
[6263]-211

Printed for: B.E. (Mechanical Engineering)

Instructions to the candidates

  1. Answer Q1 or Q2, Q3 or Q4, Q5 or Q6, Q7 or Q8.
  2. Neat diagrams must be drawn wherever necessary.
  3. Use of logarithmic tables, slide rule, and electronic pocket calculator is allowed.
  4. Figures to the right indicate full marks.
  5. Assume suitable data, if necessary.

Questions

  1. Q1

    1. a)

      A combination of seven number of identical springs, each having a stiffness of ‘K’, supports a mass ‘m’ as shown in figure 1.Find the natural frequency of oscillations of mass ‘m’.

      [8]
    2. b)

      Explain with a neat diagram mathematical model of a Motor Bike.

      Also asked:May 2023

      [5]
    3. c)

      Explain the following terms used in vibration i) Natural Frequency ii) Amplitude iii) Time period iv) Resonance 2

      [4]

  2. Q2

    1. a)

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

      [8]
    2. b)

      Derive the expression for Logarithmic decrement.

      [5]
    3. c)

      Define the following terms used in vibration i) Critical Damping coefficient ii) Coulomb damping

      [4]

  3. Q3

    1. a)

      A vibrating system having a mass of 1 kg is suspended by a spring of stiffness 1000 N/m. It is put to harmonic excitation of 10 N. Assuming viscous damping, determine i) resonant frequency ii) the phase angle at resonance iii) amplitude of resonance iv) frequency corresponding to peak amplitude v) damped frequency. Take C = 40 N-S/m.

      [10]
    2. b)

      Explain Transmissibility Vs. frequency ratio curve for different amounts of damping.

      [8]

  4. Q4

    1. a)

      The springs of an automobile trailer are compressed 0.1m under its own weight. Find the critical speed when the trailer is passing over a road with a profile of sine-wave whose amplitude is 80 mm and the wavelength is 14 m. Find the amplitude of vibration at a speed of 60 km/hr.

      Also asked:Nov 2024

      [10]
    2. b)

      Derive an expression for deflection of vertical shaft carrying a single rotor without damping. 3

      Also asked:May 2025 ·Nov 2023

      [8]

  5. Q5

    1. a)

      Find the natural frequency of the system shown in figure 2.

      [10]
    2. b)

      Derive the equation for the length of Torsionally Equivalent Shaft.

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

      [8]

  6. Q6

    1. a)

      Using Matrix Method, determine only the natural frequencies of the system shown in figure. 3

      [10]
    2. b)

      Explain free vibrations of a two rotor system using following parameters i) neat diagram ii) frequency equations iii) Position of node iv) amplitude ratios of two rotors. 4

      [8]

  7. Q7

    1. a)

      Differentiate Time domain and frequency domain Analysis. Explain how frequency spectrum can be used to detect vibration related faults in a system.

      Also asked:Nov 2024 ·Nov 2022

      [8]
    2. b)

      Write a short note on piezoelectric accelerometer.

      [5]
    3. c)

      Explain any one vibration isolator with a neat sketch.

      [4]

  8. Q8

    1. a)

      Derive a relation between sound intensity level and sound pressure level.

      Also asked:May 2023

      [8]
    2. b)

      Explain anechoic chamber and reverberant chamber.

      Also asked:May 2025 ·Nov 2022

      [5]
    3. c)

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

      [4]