Machine Kinematics

Mechanism

Question 1
Marks : +2 | -2
Pass Ratio : 100%
The Grubler’s criterion for determining the degrees of freedom (n) of a mechanism having plane motion is
n = (l – 1) – j
n = 2(l – 1) – 2j
n = 3(l – 1) – 2j
n = 4(l – 1) – 3j
Explanation:
None
Question 2
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 3
Marks : +2 | -2
Pass Ratio : 100%
Scotch yoke mechanism is used to generate
sine functions
square roots
logarithms
inversions
Explanation:
None.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The mechanism consisting of three turning pairs and one sliding pair, is called a
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 5
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 6
Marks : +2 | -2
Pass Ratio : 100%
The inversion of a mechanism is
changing of a higher pair to a lower pair
turning its upside down
obtained by fixing different links in a kinematic chain
obtained by reversing the input and output motion
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 7
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is an inversion of a double slider crank chain?
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 8
Marks : +2 | -2
Pass Ratio : 100%
A kinematic chain is known as a mechanism when
none of the links is fixed
one of the links is fixed
two of the links are fixed
none of the mentioned
Explanation:
When one of the links of a kinematic chain is fixed, the chain is known as mechanism.
Question 9
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.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
In a four bar chain or quadric cycle 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:
Four bar chain or quadric cycle chain consists of four links, each of them forms a turning pair.