Theory of Machines

1. typewriter mechanism has 7 number of binary joints, six links and none of higher pairs. The mechanism is

  1. kinematically sound
  2. not sound
  3. soundness would depend upon which link is kept fixed
  4. data is not sufficient to determine same
  5. none of the above.

Correct answer: (A)
kinematically sound

2. 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
  5. none of the above.

Correct answer: (A)
90 RPM

3. A cam mechanism imparts following motion

  1. rotating
  2. oscillating
  3. reciprocating
  4. all of the above
  5. none of the above.

Correct answer: (D)
all of the above

4. A cam with a roller follower would con stitute following type of pair

  1. lower pair
  2. higher pair
  3. open pair
  4. close pair
  5. cam pair.

Correct answer: (B)
higher pair

5. A chain comprises of 5 links having 5 joints. Is it kinematic chain ?

  1. yes
  2. no
  3. it is a marginal case
  4. data are insufficient to determine it
  5. unpredictable.

Correct answer: (B)
no

6. A circle passing through the pitch point with its center at the center of cam axis is known as

  1. pitch circle
  2. base circle
  3. prime circle
  4. outer circle
  5. cam circle.

Correct answer: (C)
prime circle

7. A circular bar moving in a round hole is an example of

  1. incompletely constrained motion
  2. partially constrained motion
  3. completely constrained motion
  4. successfully constrained motion
  5. none of the above

Correct answer: (A)
incompletely constrained motion

8. A completely constrained motion can be transmitted with .

  1. 1 link with pin joints
  2. 2 links with pin joints
  3. 3 links with pin joints
  4. 4 links with pin joints
  5. all of the above.

Correct answer: (D)
4 links with pin joints

9. A foot step bearing and rotor of a vertical turbine form examples of

  1. incompletely constrained motion
  2. partially constrained motion
  3. completely constrained motion
  4. successfully constrained motion
  5. none of the above.

Correct answer: (B)
partially constrained motion

10. A kinematic chain requires at least

  1. 2 links and 3 turning pairs
  2. 3 links and 4 turning pairs
  3. 4 links and 4 turning pairs
  4. 5 links and 4 turning pairs
  5. none of the above.

Correct answer: (C)
4 links and 4 turning pairs

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