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InsemSep 20232019 patternBE Mech

Dynamics of Machinery SPPU Insem Question Paper Sep 2023

All 4 questions from this SPPU insem 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
Insem
Session
Sep 2023
Max. marks
30
Time
1 Hour 15 minutes
Semester
VII
Paper code
[6188]-155

Printed for: B.E. (Mechanical) (Insem)

Instructions to the candidates

  1. Answer Q.1 or Q.2, Q.3 or Q.4.
  2. Neat diagrams must be drawn wherever necessary.
  3. Figures to the right side indicate full marks.
  4. Assume suitable data wherever necessary.

Questions

  1. Q1

    1. a)

      What is meant by primary and secondary balancing of reciprocating masses?

      [6]
    2. b)

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

      [9]

  2. Q2

    1. a)

      Explain the method of direct and reverse cranks to determine the unbalance forces in radial engines.

      Also asked:Oct 2022

      [6]
    2. b)

      A shaft carries four masses in parallel planes A, B, C and D in this order along its length. The masses at B and C are 18 kg and 12.5 kg respectively, and each has an eccentricity of 60 mm. The masses at A and D have an eccentricity of 80 mm. The angle between the masses at B and C is 100º and that between the masses at B and A is 190º, both being measured in the same direction. The axial distance’ between the planes A and B is 100 mm and that between B and C is 200 mm. If the shaft is in complete dynamic balance, determine: i) The magnitude of the masses at A and D ii) The distance between planes A and D iii) The angular position of the mass at D 2

      [9]

  3. Q3

    1. a)

      Explain the effect of gyroscopic couple on two wheeler.

      [7]
    2. b)

      An areoplane makes a complete half circle of 90 m radius, towards right when flying at 400 km/hr. The rotating engine and the propeller of the plane have a mass 500 kg with a radius of gyration of 40 cm. The engine rotates at 3000 rpm in anticlockwise direction when viewed from the front end. Find the gyroscopic couple on plane and state its effect on it.

      [8]

  4. Q4

    1. a)

      Derive from the first principles an expression for the gyroscopic couple.

      [6]
    2. b)

      A ship is propelled by a turbine rotor having a mass of 500 kg and speed of 2100 rpm. The rotor has radius of gyration of 500 mm and rotates in clockwise direction when viewed from the stern. Determine gyroscopic couple and its effect in following conditions: i) The ship takes left turn at radius of 300 m at speed of 30 km/hr. ii) The ship pitches 6 0 above and 6 0 below the horizontal position. The bow is descending with maximum velocity. The pitching motion is simple harmonic with a periodic time of 20 sec. iii) The ship rolls and at certain instant it has angular velocity of 0.03 rad/sec clockwise when viewed from stern.   

      Also asked:Oct 2022

      [9]