Engineering Questions with Answers - Multiple Choice Questions
Machine Kinematics Questions and Answers – Grubler’s Criterion for Plane Mechanisms
1 - Question
The approximate straight line mechanism is a
a) 4 bar linkage
b) 6 bar linkage
c) 8 bar linkage
d) 3 bar linkage
View Answer
Answer: a
Explanation: The straight line mechanism has 4 bar linkage.
2 - Question
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
View Answer
Answer: c
Explanation: Two elemets which are not held together form open pairs.
Two elements held together mechanically form a closed pair.
3 - Question
Peaucellier mechanism has
a) 8 links
b) 6 links
c) 4 links
d) 5 links
View Answer
Answer: a
Explanation: Peaucellier mechanism has 8 links.
Hart mechanism has 6 links.
4 - Question
Hart mechanism has
a) 8 links
b) 6 links
c) 4 links
d) 5 links
View Answer
Answer: b
Explanation: Hart mechanism has 6 links.
Peaucellier mechanism has 8 links.
5 - Question
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
View Answer
Answer: b
Explanation: Kinematic chain is one which satisfies
L = 2/3 (J + 2),
which is not satisfied in this case.
6 - Question
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
View Answer
Answer: a
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 - Question
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
View Answer
Answer: d
Explanation: The sliding pair wears rapidly due to friction and is bulky also.
8 - Question
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
View Answer
Answer: b
Explanation: If one of the links of the constrained chain is fixed, it results into mechanism.
9 - Question
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
View Answer
Answer: c
Explanation: Eccentric sheave is equivalent to 2 links, 1 link is due to oscillatory link, and one is fixed link.
10 - Question
Whitworth quick return mechanism is obtained by inversion of
a) slider crank mechanism
b) kinematic chain
c) five link mechanism
d) roller cam mechanism
View Answer
Answer: a
Explanation: None.