Machine Kinematics

Mechanism

Question 1
Marks : +2 | -2
Pass Ratio : 100%
If the number of links in a mechanism are equal to l, then the number of possible inversions are equal to
l – 2
l – 1
l
l + 1
Explanation:
Whatever is the number of links in a mechanism, only that much number of inversion can be obtained.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
In a coupling rod of a locomotive, each of the four pairs is a _____________ pair.
sliding
turning
rolling
screw
Explanation:
In a locomotive, one rod of the coupling rod can only turn or revolve about a fixed axis of another rod. This takes place only in case of turning pair.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is an inversion of a single slider crank chain?
Pendulum pump or Bull engine
Rotary internal combustion engine
Oscillating cylinder engine
Crank and slotted lever quick return motion mechanism
Explanation:
All the mechanisms mentioned above are forms of single slider crank chain only and hence, they all contain three turning pairs and one sliding pair. The inversion of a single slider crank chain are found in the following mechanism:
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
0
1
2
-1
Explanation:
A structure can be formed only when the number of degrees of freedom is zero.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as
structure
machine
inversion
compound mechanism
Explanation:
We can obtain as many mechanisms as the number of links in kinematic chain by fixing, in turn,different links in a kinematic chain. This method is known as inversion of the mechanism.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
The whitworth quick return motion mechanism is formed in a slider crank chain when the
coupler link is fixed
longest link is a fixed link
slider is a fixed link
smallest link is a fixed link
Explanation:
None.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
In a single slider crank chain
each of the four pairs is a turning pair
one is a turning pair and three are sliding pairs
two are turning pairs and two are sliding pairs
three are turning pairs and one is a sliding pair
Explanation:
Single slider crank chain consists of one sliding pair and three turning pairs.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
The mechanism in which two are turning pairs and two are sliding pairs, is called a
elliptical trammel
scotch yoke mechanism
oldham’s coupling
all of the mentioned
Explanation:
A double slider crank chain consists of two sliding pairs and two turning pairs. The inversions of a double slider crank chain are as follows:
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Whitworth quick return motion mechanism is an inversion of a double slider crank chain.
True
False
Explanation:
Whitworth quick return motion mechanism is a form of single slider crank chain and it consists of one sliding pair and three turning pairs.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
A point on a connecting link of a double slider crank mechanism traces a
straight line path
hyperbolic path
parabolic path
elliptical path
Explanation:
None.