Dynamics Of Machines Set 7

Mechanical Engineering

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This set of Dynamics of Machines Multiple Choice Questions & Answers (MCQs) focuses on Dynamics Of Machines Set 7

Q1 | Calculate the natural longitudinal frequency in Hz.
  • 575
  • 625
  • 525
  • 550
Answer: 575
Q2 | 01mm.
  • 44.14
  • 49.85
  • 43.43
  • 46.34
Answer: 49.85
Q3 | Determine the frequency of transverse vibrations of the shaft.
  • 31
  • 35
  • 37
  • 41
Answer: 41
Q4 | Determine the static deflection of the shaft in mm.
  • 0.147
  • 0.213
  • 0.132
  • 0.112
Answer: 0.147
Q5 | 665×10-3m, calculate the critical speed of the shaft in rps. Centre of disc at 0.25m away from centre of axis of shaft.
  • 8.64
  • 9.64
  • 10.64
  • 12.2
Answer: 12.2
Q6 | 5 m. Find the natural frequency of torsional vibrations.
  • 5.32
  • 5.86
  • 5.65
  • 6.66
Answer: 5.32
Q7 | 6m, l2=0.5m, l3=0.4m
  • 8.95
  • 7.95
  • 6.95
  • 5.95
Answer: 8.95
Q8 | 85m, kb = 0.55m C = 80 GN/m2
  • 3.37
  • 7.95
  • 6.95
  • 5.95
Answer: 3.37
Q9 | 095m, d2=0.06m, d3=0.05m Ma = 900 Kg, Mb = 700 Kg
  • 0.855m
  • 0.795m
  • 0.695m
  • 0.595m
Answer: 0.855m
Q10 | 05, 0.06, 0.07.
  • 0.05
  • 0.06
  • 0.07
  • 0.08
Answer: 0.08
Q11 | 5m and 70mm in diameter, the middle rotor is at a distance 1.5m from one end. Calculate the free torsional vibration frequency for a single node system in Hz if the mass moment of inertia of rotors in Kg- m2 are: 0.15, 0.3 and 0.09. C=84 kN/mm2
  • 171
  • 181
  • 191
  • 201
Answer: 171
Q12 | 5m and 70mm in diameter, the middle rotor is at a distance 1.5m from one end. Calculate the free torsional vibration frequency for a two node system in Hz if the mass moment of inertia of rotors in Kg- m2 are: 0.15, 0.3 and 0.09. C=84 kN/mm2
  • 257
  • 281
  • 197
  • 277
Answer: 277
Q13 | Neglecting the inertia of shaft and gears calculate the frequency of free torsional vibrations in Hz.
  • 4.7
  • 5.7
  • 4.5
  • 5.5
Answer: 4.7
Q14 | 5 and the mean speed is 20 rpm, find the maximum speed.
  • 15 rpm
  • 25 rpm
  • 30 rpm
  • 40 rpm
Answer: 25 rpm
Q15 | 5 and the mean speed is 20 rpm, find the minimum speed.
  • 15 rpm
  • 25 rpm
  • 30 rpm
  • 40 rpm
Answer: 15 rpm
Q16 | 3 m. The engine rotates at 2400 r.p.m. clockwise when viewed from the rear. Find the gyroscopic couple on the aircraft.
  • 10.046 kn-m
  • 11.046 kn-m
  • 12.046 kn-m
  • 13.046 kn-m
Answer: 10.046 kn-m
Q17 | 6 m. It rotates at 1800 r.p.m. clockwise, when looking from the stern. Determine the gyroscopic couple, if the ship travels at 100 km/hr and steer to the left in a curve of 75 m radius.
  • 100.866 kn-m
  • 200.866 kn-m
  • 300.866 kn-m
  • 400.866 kn-m
Answer: 200.866 kn-m
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