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%
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 3
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 4
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 5
Marks : +2 | -2
Pass Ratio : 100%
A type-writer constitutes a machine.
True
False
Explanation:
When a mechanism is required to transmit power or to do some particular type of work, it then becomes a machine.But in case of a typewriter there is no case of power transmission. Hence it is not a machine.
Question 6
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 7
Marks : +2 | -2
Pass Ratio : 100%
Scotch yoke mechanism is used to generate
sine functions
square roots
logarithms
inversions
Explanation:
None.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which of the following statement is correct as regard to the difference between a machine and a structure?
The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another.
The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only.
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work.
all of the mentioned
Explanation:
None
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%
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.