1. The equation of motion for a single degree of freedom system with viscous damping is given below in which, the damping ratio of the system is
Answer
Correct Answer:
9/16
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2. When there is a reduction in amplitude over every cycle of vibration, then the body is said to have
Answer
Correct Answer:
Damped vibration
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3. At the nodal point in a shaft, the amplitude for torsional vibration will be
Answer
Correct Answer:
Zero
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4. A shaft carrying three rotors will have
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Correct Answer:
Two nodes
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5. Frequency of vibrations is usually expressed in
Answer
Correct Answer:
Number of cycles per second
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6. A single degree of freedom system is given by the following equation with usual notations. It represents:
Answer
Correct Answer:
Forced vibration with damping
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7. Critical damping is a function of
Answer
Correct Answer:
Mass and stiffness
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8. If the damping factor for a vibrating system is unity, then the system will be
Answer
Correct Answer:
Critically damped
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9. Longitudinal vibrations are said to occur when the particles of a body moves
Answer
Correct Answer:
Parallel to its axis
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10. When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as
Answer
Correct Answer:
Compound pendulum
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11. In order to double the period of a simple pendulum, the length of the string should be
Answer
Correct Answer:
Quadrupled
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12. In under damped vibrating system, the amplitude of vibration
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Correct Answer:
Decreases exponentially with time
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13. The ratio of the actual damping coefficient to the critical damping coefficient is called.
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Correct Answer:
Damping factor
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14. The amplitude of vibration is always the radius of the circle.
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Correct Answer:
Equal to
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15. In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is
Answer
Correct Answer:
180°
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16. The critical speed of a shaft in revolution per second is as that of natural frequency of transverse vibration.
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Correct Answer:
Same
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17. The periodic time is given by (where ω = Angular velocity of the particle in rad/s)
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Correct Answer:
2π/ω
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18. The periodic time of a compound pendulum is _ when the distance between the point of suspension and the centre of gravity is equal to the radius of gyration of the body about its centre of gravity.
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Correct Answer:
Minimum
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19. The equation of free vibrations of a system is given below, Its natural frequency is,
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Correct Answer:
3 Hz
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20. The velocity of a body moving with simple harmonic motion is at the mean position.
Answer
Correct Answer:
Maximum
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21. The equation of motion for a vibrating system with viscous damping is If the roots of this equation are real, then the system will be
Answer
Correct Answer:
Overdamped
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22. The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as
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Correct Answer:
Magnification factor
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23. The critical speed of a shaft depends upon its
Answer
Correct Answer:
Mass and stiffness
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24. A shaft carrying two rotors at its ends will have
Answer
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One node
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25. When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will
Answer
Correct Answer:
Oscillate with increasing time period
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26. When the particles of a body moves perpendicular to its axis, then the body is said to be,
Answer
Correct Answer:
Transverse vibration
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27. The maximum velocity of a particle moving with simple harmonic motion is
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Correct Answer:
ωr
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28. Torsional vibrations are said to occur when the particles of a body moves
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Correct Answer:
In a circle about its axis
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29. The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as
Answer
Correct Answer:
Magnification factor
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30. The frequency of oscillation at compared to earth will be
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Correct Answer:
2.44 times less
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31. A reed type tachometer use the principle of
Answer
Correct Answer:
Transverse vibration
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32. The stress induced in a body will be shear stress, when it is subjected to
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Correct Answer:
Torsional vibrations
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33. Which among the following is not considered when reference standards are used in the field of mechanical vibration and shock, monitoring and analysis of machines?
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Correct Answer:
None of the above
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34. Which basic document describes general requirements for measurement and evaluation of machine vibrations using shaft measurements?
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Correct Answer:
ISO – 7919-1
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35. Which of the following is a type of untuned vibration absorber?
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Correct Answer:
Houdaille damper
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36. Which of the following methods can be used to reduce excitation level at the source?
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Correct Answer:
Both a and b
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37. Which of the following conditions is/are to be satisfied by the seismometer for it to be used as velometer?
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Correct Answer:
It's natural frequency should be large
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38. Which of the following vibrometers have frequency ratio (ω/ωn) << 1?
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Correct Answer:
Accelerometers
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39. Which type of monitoring system uses stroboscope to measure speed of the machine?
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Correct Answer:
Basic condition monitoring system
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40. Seismometer can be used to measure acceleration of any instrument only if _____
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Correct Answer:
both a. and b.
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41. Which of the following statements is/are true?
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Correct Answer:
Torsional vibrations do not occur in a three rotor system, if rotors rotate in same direction
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42. Simulation is a process which _________
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Correct Answer:
Explores behavior of a model by varying input variables
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43. What is meant by geometric modeling?
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Correct Answer:
Both a and b
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44. Magnification factor is the ratio of ______
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Correct Answer:
Amplitude of steady state vibrations and zero frequency deflection
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45. Determine natural frequency of a system, which has equivalent spring stiffness of 30000 N/m and mass of 20 kg?
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Correct Answer:
6.16 Hz
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46. According to which method, maximum kinetic energy at mean position is equal to maximum potential energy at extreme position?
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Correct Answer:
Rayleigh's method
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47. What are deterministic vibrations?
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Correct Answer:
Vibrations caused due to unknown exciting force
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48. Which of the following vibrations are classified according to the magnitude of actuating force?
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Correct Answer:
Deterministic vibrations
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49. In which type of vibrations, amplitude of vibration goes on decreasing every cycle?
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Correct Answer:
Damped vibrations
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50. What are discrete parameter systems?
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Correct Answer:
Systems which have finite number of degree of freedom
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51. The unbalanced force caused due to reciprocating mass is given by the equation
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Correct Answer:
mrω2 cos θ + mrω2 (cos 2θ/n)
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52. Which of the following factors are not responsible for unbalancing in rotating systems?
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Correct Answer:
None of the above
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53. What is the name of the gear's diameter in millimeters?
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Correct Answer:
Pitch
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54. What is another name for gear ratio?
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Correct Answer:
Module
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55. What type of Pitch is the ratio of the number of teeth on the gear?
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Correct Answer:
Diametral
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56. What is the name of the number of teeth on the gear?
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Correct Answer:
Diametral Pitch
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57. What is the name of the theoretical circle that all calculations are based on?
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Correct Answer:
Pitch circle
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58. What is the name of a theoretical circle on which all calculations are based?
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Correct Answer:
Pitch circles
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59. What are the smaller gears often called?
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Correct Answer:
Pinion
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60. What other name is used to refer to the larger of the two mating gears?
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Correct Answer:
Gear or the wheel
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61. In what type of gears are the teeth straight and parallel to the axes of rotation?
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Correct Answer:
Spur gears
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62. How are the axes of the two shafts of spur gears?
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Correct Answer:
Parallel
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63. What can we do to find the maximum and minimum values of the pressure angle?
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Correct Answer:
Differentiate this equation
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64. What do gears usually do?
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Correct Answer:
Transmit rotary motion between two shafts
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65. What are machine elements used to transmit rotary motion between two shafts?
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Correct Answer:
Gears
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66. What does the third-order kinematic coefficient show the rate of change of?
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Correct Answer:
Y with respect to the input position theta
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67. What is the second-order kinematic coefficient?
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Correct Answer:
Curvature of the cam
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68. What is a second-order coefficient?
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Correct Answer:
Kinematic
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69. What is the second order coefficient related to?
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Correct Answer:
The curvature of the cam
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70. What is a measure of the "steepness" of the displacement diagram?
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Correct Answer:
First-order kinematic coefficient
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71. What does the first-order kinematic coefficient represent?
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Correct Answer:
The slope of the displacement diagram
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72. What are additional graphs that can be plotted representing the derivative of y with respect to the input position theta?
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Correct Answer:
Kinematic coefficients
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73. What is plotted as the ordinate regardless of the type of cam or the type of follower?
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Correct Answer:
The follower output motion y
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74. What is plotted with the input motion of a cam as the abscissa and the follower output motion as the ordinate?
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Correct Answer:
Displacement diagram
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75. Which axis is the smallest circle centered on?
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Correct Answer:
Cam rotation axis
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76. Where does the cam axis rotate?
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Correct Answer:
At the cam rotation axis
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77. Where does the pitch curve Locus get it's name from?
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Correct Answer:
The trace point
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78. What is the name of the curve that shows how a pitch moves across an octave?
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Correct Answer:
Pitch Curve Locus
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79. What is the point of a Trace Point?
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Correct Answer:
Theoretical point of the follower
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80. Where is the point of the follower?
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Correct Answer:
Trace Point
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81. What is the surface developed by holding the cam stationary?
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Correct Answer:
The cam surface
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82. What is the nomenclature for the follower that is being rotated?
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Correct Answer:
The cam surface
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83. What is the unit of measurement for abscissa?
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Correct Answer:
One cycle of the input motion theta
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84. To what scale is the abscissa of a displacement diagram drawn?
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Correct Answer:
Any convenient
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85. What is the abscissa usually drawn to?
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Correct Answer:
Any convenient scale
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86. What type of constraint do the two contact points provide?
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Correct Answer:
Constant-breadth
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87. What provides the constraint in a constant-breadth cam?
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Correct Answer:
Two contact points
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88. What is the most common type of follower?
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Correct Answer:
Reciprocating
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89. What is a machine element used to drive another element called?
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Correct Answer:
A follower
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90. In what medium is a machine element used to drive another element, called a follower?
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Correct Answer:
Cam
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91. What does the term jerk stand for in physics?
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Correct Answer:
Time derivative of acceleration
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92. What is the time derivative of acceleration?
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Correct Answer:
Jerk
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93. What rate of change do angular acceleration and angular velocity have in relation to each other?
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Correct Answer:
Time
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94. What is the time rate of change of an object's angular velocity?
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Correct Answer:
Acceleration
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95. What is the time rate of change of the angular velocity called?
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Correct Answer:
Angular acceleration
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96. What is the name of the rate of change of velocity?
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Correct Answer:
Instantaneous acceleration
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97. What is the time rate of change of velocity of an object when it is traveling at the speed of light?
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Correct Answer:
Instantaneous
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98. What does the Scotch yoke do to the rod?
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Correct Answer:
Has the effect of a connecting rod of infinite length
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99. What has the effect of a connecting rod of infinite length?
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Correct Answer:
Scotch yoke
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100. The second terms of the previous equations become what if the Scotch yoke is used?
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Correct Answer:
Zero
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101. What is the definition of the magnitude of the angular velocity?
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Correct Answer:
The time rate of change of the angular orientation of any line
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102. Magnitude of the angular velocity is defined as the time rate of change of the angular orientation of what?
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Correct Answer:
Line
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103. The angular velocity of a rotating body is now defined as a what?
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Correct Answer:
Vector quantity
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104. What type of quantity is omega?
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Correct Answer:
Vector
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105. For what is the instantaneous velocity of a moving object defined?
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Correct Answer:
The limit of this ratio for an infinitesimally small time interval
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106. What is the definition of instantaneous velocity?
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Correct Answer:
Limit of this ratio
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