### Theory of Machines

1. For a kinematic chain to be considered as mechanism

1. two links should be fixed
2. one link should be fixed
3. none of the links should be fixed
4. there is no such criterion
5. none of the above.

2. 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.

kinematically sound

3. “Open pairs are those which have

1. point or line contact between the two elements when in motion
2. surface contact between the two ele-ments when in motion
3. elements of pairs not held together mechanically
4. two elements that permit relative motion
5. none of the above.

elements of pairs not held together mechanically

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
5. none of the above.

90 RPM

5. A cam mechanism imparts following motion

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

all of the above

6. 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.

higher pair

7. 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.

no

8. 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.

prime circle

9. 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

incompletely constrained motion

10. 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.