250+ TOP MCQs on Grubler’s Criterion for Plane Mechanisms and Answers

Machine Kinematics Multiple Choice Questions on ” Grubler’s Criterion for Plane Mechanisms”.

1. The approximate straight line mechanism is a
a) 4 bar linkage
b) 6 bar linkage
c) 8 bar linkage
d) 3 bar linkage
Answer: a
Clarification: The straight line mechanism has 4 bar linkage.

2. Open pairs are those which have
a) point or line contact between the two elements when in motion
b) surface contact between the two elements when in motion
c) elements of pairs not held together mechanically
d) two elements that permit relative motion
Answer: c
Clarification: Two elemets which are not held together form open pairs.
Two elements held together mechanically form a closed pair.

3. Peaucellier mechanism has
a) 8 links
b) 6 links
c) 4 links
d) 5 links
Answer: a
Clarification: Peaucellier mechanism has 8 links.
Hart mechanism has 6 links.

4. Hart mechanism has
a) 8 links
b) 6 links
c) 4 links
d) 5 links
Answer: b
Clarification: Hart mechanism has 6 links.
Peaucellier mechanism has 8 links.

5. A chain comprises of 5 links having 5 joints. Is it kinematic chain?
a) Yes
b) No
c) It is a marginal case
d) None of the mentioned
Answer: b
Clarification: Kinematic chain is one which satisfies
L = 2/3 (J + 2),
which is not satisfied in this case.

6. In the following equation [ L = 2/3(J + 2)] to determine whether or not the given chain in kinematic, higher pair is treated equivalent to
a) two lower pairs and an additional links
b) two higher pairs and two additional links
c) one lower pairs and two additional links
d) none of the mentioned
Answer: a
Clarification: In the above equation, each higher pair is taken equivalent to two lower pairs and an additional link.
If one of the links of the constrained chain is fixed, it results into mechanism.

7. The main disadvantage of the sliding pair is that it is
a) bulky
b) difficult to manufacture
c) wears rapidly
d) both a and c
Answer: d
Clarification: The sliding pair wears rapidly due to friction and is bulky also.

8. For a kinematic chain to be considered as mechanism
a) two links should be fixed
b) one link should be fixed
c) none of the links should be fixed
d) there is no such criterion
Answer: b
Clarification: If one of the links of the constrained chain is fixed, it results into mechanism.

9. An eccentric sheave pivoted at one point rotates and transmits oscillatory motion to a link whose one end is pivoted and other end is connected to it. This mechanism has
a) 2 links
b) 3 links
c) 4 links
d) 5 links
Answer: c
Clarification: Eccentric sheave is equivalent to 2 links, 1 link is due to oscillatory link, and one is fixed link.

10. Whitworth quick return mechanism is obtained by inversion of
a) slider crank mechanism
b) kinematic chain
c) five link mechanism
d) roller cam mechanism
Answer: a
Clarification: None.