Dynamics of Machinery important questionsMost repeated in SPPU papers
These 24 questions appeared in more than one SPPU Dynamics of Machinery paper we have: 11 papers, from Oct 2022 to Nov 2025. The most-asked come first. Each one links to the papers it was asked in.
Repeated questions
Endsem questions (21)
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- 2×asked
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.
- 2×asked
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 31400 N/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.
- 2×asked
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 seconds and amplitude of vibration should reduce to one- sixteenth in one cycle. Find the spring stiffness and the damping coefficient of shock absorber.
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Insem questions (3)
- 2×asked
A ship is propelled by a turbine rotor having a mass of 6000 kg and speed of 2400 rpm. The direction of rotation of rotor is anticlockwise when viewed from the bow end. The radius of gyration of rotor is 450 mm. Determine the gyroscopic effect on ship, when, i) Ship is steering to the left in a curve of 60 m radius at a speed of 18 knots (1 knot = 1860 m/hr). ii) Ship is pitching in S.H.M. with bow descending (falling) with maximum velocity. The time period of pitching is 18 seconds and the ship pitches 7.5° above and 7.5° below the normal position. iii) Ship is rolling and at the instant, its angular velocity is 0.035 rad/s counter clockwise when viewed from stern.
- 2×asked
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.
- 2×asked
Questions count as repeated when their wording matches closely across papers. Numericals that depend on a figure are left out, since the figure changes from paper to paper.