1.According to criterion of constraint by A.W. Klein
a) J + 1/2 H = 3/2L – 2
b) H + 1/2J = 2/3L – 2
c) J + 1/2H = 3/2L – 1
d) J + 3/2H = 1/2L – 2
Explanation: The criterion for a chain to be constrained is
J + 1/2 H = 3/2L – 2
2. A quarternary joint is equivalent to
a) one binary joint
b) two binary joints
c) three binary joints
d) four binary joints
Explanation: A quarternary joint is equivalent to three binary joints
3. A typewriter mechanism has 7 number of binary joints, six links and none of higher pairs. The mechanism is
a) kinematically sound
b) not sound
c) soundness would depend upon which link is kept fixed
d) none of the mentioned
Explanation: J + 1/2 H = 3/2L – 2
or, 7 + 0 = 3/2 x 6 -2
or, 7 = 7
Hence, it is Kinematically sound.
4. The approximate straight line mechanism is a
a) 4 bar linkage
b) 6 bar linkage
c) 8 bar linkage
d) 3 bar linkage
Explanation: The straight line mechanism has 4 bar linkage.
5. 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.
6. Peaucellier mechanism has
a) 8 links
b) 6 links
c) 4 links
d) 5 links
Explanation: Peaucellier mechanism has 8 links.
Hart mechanism has 6 links.
7. Hart mechanism has
a) 8 links
b) 6 links
c) 4 links
d) 5 links
Explanation: Hart mechanism has 6 links.
Peaucellier mechanism has 8 links.
8. 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.
9. 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
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
10. 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.