# Machine Kinematics Questions and Answers – Grubler’s Criterion for Plane Mechanisms

This set of Machine Kinematics Multiple Choice Questions & Answers (MCQs) focuses on ” Grubler’s Criterion for Plane Mechanisms”.

1. The approximate straight line mechanism is a

Explanation: 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

Explanation: Two elemets which are not held together form open pairs.
Two elements held together mechanically form a closed pair.

3. Peaucellier mechanism has

Explanation: Peaucellier mechanism has 8 links.

4. Hart mechanism has

Explanation: Hart mechanism has 6 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

Explanation: 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
d) none of the mentioned

Explanation: 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

Explanation: 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

Explanation: 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

10. Whitworth quick return mechanism is obtained by inversion of
a) slider crank mechanism
b) kinematic chain
d) roller cam mechanism

Explanation: None.

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