Engineering Questions with Answers - Multiple Choice Questions
Machine Kinematics Questions and Answers – Mechanism – 1
1 - Question
A type-writer constitutes a machine.
a) True
b) False
View Answer
Answer: b
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.
2 - Question
The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as
a) structure
b) machine
c) inversion
d) compound mechanism
View Answer
Answer: c
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.
3 - Question
If the number of links in a mechanism are equal to l, then the number of possible inversions are equal to
a) l – 2
b) l – 1
c) l
d) l + 1
View Answer
Answer: c
Explanation: Whatever is the number of links in a mechanism, only that much number of inversion can be obtained.
4 - Question
Which of the following statement is correct as regard to the difference between a machine and a structure?
a) The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another.
b) The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only.
c) A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work.
d) all of the mentioned
View Answer
Answer: d
Explanation: None
5 - Question
A kinematic chain is known as a mechanism when
a) none of the links is fixed
b) one of the links is fixed
c) two of the links are fixed
d) none of the mentioned
View Answer
Answer: b
Explanation: When one of the links of a kinematic chain is fixed, the chain is known as mechanism.
6 - Question
The inversion of a mechanism is
a) changing of a higher pair to a lower pair
b) turning its upside down
c) obtained by fixing different links in a kinematic chain
d) obtained by reversing the input and output motion
View Answer
Answer: c
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.
7 - Question
The Grubler’s criterion for determining the degrees of freedom (n) of a mechanism having plane motion is
a) n = (l – 1) – j
b) n = 2(l – 1) – 2j
c) n = 3(l – 1) – 2j
d) n = 4(l – 1) – 3j
View Answer
Answer: c
Explanation: None
8 - Question
The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
a) 0
b) 1
c) 2
d) -1
View Answer
Answer: a
Explanation: A structure can be formed only when the number of degrees of freedom is zero.
9 - Question
In a four bar chain or quadric cycle chain
a) each of the four pairs is a turning pair
b) one is a turning pair and three are sliding pairs
c) two are turning pairs and two are sliding pairs
d) three are turning pairs and one is a sliding pair
View Answer
Answer: a
Explanation: Four bar chain or quadric cycle chain consists of four links, each of them forms a turning pair.
10 - Question
The mechanism in which two are turning pairs and two are sliding pairs, is called a
a) double slider crank chain
b) elliptical trammel
c) scotch yoke mechanism
d) all of the mentioned
View Answer
Answer: d
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:
a) elliptical trammel
b) scotch yoke mechanism
c) oldham’s coupling