Inversion of Mechanism MCQ

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• When supported on three points, out of 12 degrees of freedom the number of degrees of freedom arrested in a body is
  ক

  3

  খ

  4

  গ

  5

  ঘ

  6
• Match the following Types of mechanism Motion achieved P. Scott Russel mechanism 1. Intermittent motion Q. Geneva mechanism 2. Quick return motion R. Off set slider crank mechanism 3. Simple harmonic motion S. scotch Yoke mechanism 4. Straight line motion
  ক

  P-2,Q-3,R-1,S-4

  খ

  P-3,Q-2,R-4,S-1

  গ

  P-4,Q-1,R-2,S-3

  ঘ

  P-4,Q-3,R-1,S-2
• The mechanism used in a shaping machine is
  ক

  A closed 4bar chain having 4 revolute pairs

  খ

  A closed 6bar chain having 6 revolute pairs

  গ

  A closed 4bar chain having 2 revolute and 2 sliding pairs

  ঘ

  An inversion of single slider crank chain
• The number of inversions for a slider crank mechanism is
  ক

  6

  খ

  5

  গ

  4

  ঘ

  3
• In a four bar linkage, s denotes the shortest link length, L is the longest link length, P and Q are the lengths of other two links. At least one of the three moving links will rotate by 360° if
  ক

  S + L < P + Q

  খ

  S + L > P + Q

  গ

  S + P < L + Q

  ঘ

  S + P > L + Q
• Which of the following statements is incorrect
  ক

  Grashof’s rule states that for a planar crank-rocker four bar mechanism, the sum of the shortest and longest link lengths cannot be less than the sum of the remaining two link lengths.

  খ

  Inversions of a mechanism are created by fixing different links one at a time.

  গ

  Geneva mechanism is an intermittent motion device.

  ঘ

  Gruebler’s criterion assumes mobality of a planar mechanism to be one.
• Match the approaches given below to perform stated kinematics/dynamics analysis of machine. Analysis Approach P. Continuous relative rotation 1. D’Alembert’s principle Q. Velocity and acceleration 2. Grubler’s criterion R. Mobility 3. Grashof’s law S. Dynamic-static analysis 4. Kennedy’s theorem
  ক

  P-1,Q-2,R-3,S-4

  খ

  P-3,Q-4,R-2,S-1

  গ

  P-2,Q-3,R-4,S-1

  ঘ

  P-4,Q-2,R-1,S-3
• A palnar mechanism has 8 links and 10 rotary joints. The number of degrees of freedom of the mechanism, using Grubler’s criterion, is
  ক

  0

  খ

  1

  গ

  2

  ঘ

  3
• The number of degrees of freedom of a planer linkage with 8 links and 9 simple revolute joints is
  ক

  1

  খ

  2

  গ

  3

  ঘ

  4