Lakshya Education MCQs

Question: When one of the links of a kinematic chain is fixed, the chain is known as a
Options:
A.Structure
B.Mechanism
C.Inversion
D.Machine
Answer: Option B

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Question 1. The example of completely constrained motion is a
  1.    Motion of a piston in the cylinder of a steam engine
  2.    Motion of a square bar in a square hole
  3.    Motion of a shaft with collars at each end in a circular hole
  4.    All of the above
Answer: Option D
Question 2. The example of successfully constrained motion is a
  1.    Motion of an I.C. engine valve
  2.    Motion of the shaft between a footstep bearing
  3.    Piston reciprocating inside an engine cylinder
  4.    All of the above
Answer: Option D
Question 3. What is the number of instantaneous centers for an eight link mechanism?
  1.    15
  2.    28
  3.    30
  4.    8
Answer: Option B
Question 4. A body having moment of inertia o:m2 is rotating at 210 RPM and r with another body at rest having I 40 kg m2. The resultant speed after ing will be
  1.    90 RPM
  2.    100 RPM
  3.    80 RPM
  4.    data are insufficient
Answer: Option A
Question 5. A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to
  1.    G.I₂
  2.    G².I₂
  3.    I₂/G
  4.    I₂/G²
Answer: Option B
Question 6. The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be
  1.    To dip the nose and tail
  2.    To raise the nose and tail
  3.    To raise the nose and dip the tail
  4.    To dip the nose and raise the tail
Answer: Option C

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