Dynamics of Machines MCQs | Page - 4

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πŸ“Š Dynamics of Machines
Q. If the crank and the connecting rod are 300 mm and 1 m long respectively and the crank rotates at a constant speed of 250 r.p.m., determine the crank angle at which the maximum velocity occurs is
  • (A) 45
  • (B) 75
  • (C) 90
  • (D) 60
πŸ’¬ Discuss
βœ… Correct Answer: (B) 75
πŸ“Š Dynamics of Machines
Q. Which of the following expression represent the angular acceleration α of the connecting rod?
  • (A) −ω2 . sin θ/n
  • (B) −ω2 . cos θ.n
  • (C) ω2. cos θ/n
  • (D) ω2 . sin θ.n
πŸ’¬ Discuss
βœ… Correct Answer: (A) −ω2 . sin θ/n
πŸ“Š Dynamics of Machines
Q. While calculating angular acceleration of the connecting rod, sin2(θ) term is neglected.
  • (A) true
  • (B) false
  • (C) ---
  • (D) ---
πŸ’¬ Discuss
βœ… Correct Answer: (A) true
πŸ“Š Dynamics of Machines
Q. In a slider crank mechanism, the length of the crank and connecting rod are 180 mm and 540 mm respectively. The crank position is 45° from inner dead centre. The crank shaft speed is 450 r.p.m. (clockwise), calculate angular velocity of the connecting rod in rad/s.
  • (A) 10.3
  • (B) 11.1
  • (C) 12.2
  • (D) 11.8
πŸ’¬ Discuss
βœ… Correct Answer: (B) 11.1
πŸ“Š Dynamics of Machines
Q. When a body is subjected to transverse vibrations, the stress induced in a body will be
  • (A) shear stress
  • (B) bending stress
  • (C) tensile stress
  • (D) compressive stress
πŸ’¬ Discuss
βœ… Correct Answer: (B) bending stress
πŸ“Š Dynamics of Machines
Q. For an under damped harmonic oscillator, resonance
  • (A) occurs when excitation frequency is greater than undamped natural frequency
  • (B) occurs when excitation frequency is less than undamped natural frequency
  • (C) occurs when excitation frequency is equal to undamped natural frequency
  • (D) never occurs
πŸ’¬ Discuss
βœ… Correct Answer: (C) occurs when excitation frequency is equal to undamped natural frequency
πŸ“Š Dynamics of Machines
Q. When there is a reduction in amplitude over every cycle of vibration, then the body is said to have
  • (A) free vibration
  • (B) forced vibration
  • (C) damped vibration
  • (D) none of the mentioned
πŸ’¬ Discuss
βœ… Correct Answer: (C) damped vibration
πŸ“Š Dynamics of Machines
Q. Longitudinal vibrations are said to occur when the particles of a body moves
  • (A) perpendicular to its axis
  • (B) parallel to its axis
  • (C) in a circle about its axis
  • (D) none of the mentioned
πŸ’¬ Discuss
βœ… Correct Answer: (B) parallel to its axis
πŸ“Š Dynamics of Machines
Q. When a body is subjected to transverse vibrations, the stress induced in a body will be
  • (A) shear stress
  • (B) tensile stress
  • (C) compressive stress
  • (D) none of the mentioned
πŸ’¬ Discuss
βœ… Correct Answer: (B) tensile stress

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