Machine Dynamics MCQ

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• Which of the following should be done to make an unstable system stable ?
  ক

  The gain of the system should be decreased

  খ

  The gain of the system should be increased

  গ

  The number of poles to the loop transfer function should be increased

  ঘ

  The number of zeros to the loop transfer function should be increased
• Which of the following devices are commonly used as error detectors in instruments ?
  ক

  Vernistats

  খ

  Microsyns

  গ

  Resolvers

  ঘ

  None of the mentioned
• A closed loop system is distinguished from open loop system by which of the following ?
  ক

  Servomechanism

  খ

  Feedback

  গ

  Output pattern

  ঘ

  Input pattern
• Which of the following statements is not necessarily correct for open control system ?
  ক

  Input command is the sole factor responsible for providing the control action

  খ

  Presence of non-linearities causes malfunctioning

  গ

  Less expensive

  ঘ

  Generally free from problems of non-linearities
• Which of the following is an open loop control system ?
  ক

  Field controlled D.C. motor

  খ

  Ward leonard control

  গ

  Metadyne

  ঘ

  Stroboscope
• For open control system which of the following statements is incorrect ?
  ক

  Less expensive

  খ

  Recalibration is not required for maintaining the required quality of the output

  গ

  Construction is simple and maintenance easy

  ঘ

  Errors are caused by disturbances
• The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in
  ক

  transverse vibrations

  খ

  torsional vibrations

  গ

  longitudinal vibrations

  ঘ

  none of the mentioned
• The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as
  ক

  damping factor

  খ

  damping coefficient

  গ

  logarithmic decrement

  ঘ

  magnification factor
• The factor which affects the critical speed of a shaft is
  ক

  diameter of the disc

  খ

  span of the shaft

  গ

  eccentricity

  ঘ

  all of the mentioned
• When a body is subjected to transverse vibrations, the stress induced in a body will be
  ক

  shear stress

  খ

  tensile stress

  গ

  compressive stress

  ঘ

  none of the mentioned
• Longitudinal vibrations are said to occur when the particles of a body moves
  ক

  perpendicular to its axis

  খ

  parallel to its axis

  গ

  in a circle about its axis

  ঘ

  none of the mentioned
• When there is a reduction in amplitude over every cycle of vibration, then the body is said to have
  ক

  free vibration

  খ

  forced vibration

  গ

  damped vibration

  ঘ

  none of the mentioned
• In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as
  ক

  tractive force

  খ

  swaying couple

  গ

  hammer blow

  ঘ

  none of the mentioned
• The swaying couple is due to the
  ক

  primary unbalanced force

  খ

  secondary unbalanced force

  গ

  two cylinders of locomotive

  ঘ

  partial balancing
• The partial balancing means
  ক

  balancing partially the revolving masses

  খ

  balancing partially the reciprocating masses

  গ

  best balancing of engines

  ঘ

  all of the mentioned
• The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is
  ক

  0°

  খ

  90°

  গ

  180°

  ঘ

  360°
• Which of the following statements is correct about the balancing of a mechanical system?
  ক

  If it is under static balance, then there will be dynamic balance also

  খ

  If it is under dynamic balance, then there will be static balance also

  গ

  Both static as well as dynamic balance have to be achieved separately

  ঘ

  None of the mentioned
• Cam angle is defined as the angle
  ক

  during which the follower returns to its initial position

  খ

  of rotation of the cam for a definite displacement of the follower

  গ

  through which, the cam rotates during the period in which the follower remains in the highest position

  ঘ

  moved by the cam from the instant the follower begins to rise, till it reaches its highest position
• For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is
  ক

  maximum and zero

  খ

  zero and maximum

  গ

  minimum and maximum

  ঘ

  zero and minimum
• The cam follower generally used in aircraft engines is
  ক

  knife edge follower

  খ

  flat faced follower

  গ

  spherical faced follower

  ঘ

  roller follower
• Cylindrical cams can be classified as
  ক

  circular

  খ

  tangent

  গ

  reciprocating

  ঘ

  none of the mentioned
• Throw of a cam is the maximum distance of the follower from
  ক

  base circle

  খ

  pitch circle

  গ

  root circle

  ঘ

  prime circle
• Angle of action of cam is defined as the angle
  ক

  of rotation of the cam for a definite displacement of the follower

  খ

  through which the cam rotates during the period in which the follower remains in the highest position

  গ

  moved by the cam from the instant the follower begins to rise, till it reaches its highest position

  ঘ

  moved by the cam from beginning of ascent to the termination of descent
• The pressure angle of a cam depends upon
  ক

  offset between centre lines of cam and follower

  খ

  lift of follower

  গ

  angle of ascent

  ঘ

  all of the mentioned
• Angle of ascent of cam is defined as the angle
  ক

  during which the follower returns to its initial position

  খ

  of rotation of the cam for a definite displacement of the follower

  গ

  through which the cam rotates during the period in which the follower remains in highest position

  ঘ

  moved by the cam from the instant the follower begins to rise, till it reaches its highest position
• Cam size depends upon
  ক

  base circle

  খ

  pitch circle

  গ

  prime circle

  ঘ

  outer circle
• For low and moderate speed engines, the cam follower should move with
  ক

  uniform velocity

  খ

  simple harmonic motion

  গ

  uniform acceleration and retardation

  ঘ

  cycloidal motion
• In a radial cam, the follower moves
  ক

  in a direction perpendicular to the cam axis

  খ

  in a direction parallel to the cam axis

  গ

  in any direction irrespective of the cam axis

  ঘ

  along the cam axis
• The cam follower generally used in automobile engines is
  ক

  knife edge follower

  খ

  flat faced follower

  গ

  spherical faced follower

  ঘ

  roller follower
• The size of a cam depends upon
  ক

  base circle

  খ

  pitch circle

  গ

  prime circle

  ঘ

  pitch curve