Engineering Questions with Answers - Multiple Choice Questions
Machine Kinematics Questions and Answers – Double Slider Crank Chain & its Inversions
1 - Question
Which of the following instruments is used to draw ellipses?
a) Elliptical trammels
b) Slotted lever and crank
c) Gnome engine
d) Oldham’s coupling
View Answer
Answer: a
Explanation: Elliptical trammel is an instrument which is an inversion of a double slider crank chain. It is mainly used to draw ellipses.
2 - Question
Elliptical trammels are used to convert reciprocating motion into rotary motion.
a) True
b) False
View Answer
Answer: b
Explanation: Elliptical trammels are used to draw ellipses; scotch yoke mechanisms are used to convert rotary motion into reciprocating motion.
3 - Question
How inversion is obtained in an elliptical trammel?
a) Fixing the slotted plate
b) Fixing the sliders
c) Fixing the turning pairs
d) Fixing the pin
View Answer
Answer: a
Explanation: An elliptical trammel is an instrument which is an inversion of a double slider crank chain, here the inversion is obtained by fixing the slotted plate. It is used to draw ellipses.
4 - Question
In the given figure, 1 and 2 are sliders, 3 is a bar and 4 is a fixed slotted plate, identify the mechanism.
a) Elliptical trammel
b) Scotch yoke mechanism
c) Oldham’s coupling
d) Gnome engine
View Answer
Answer: a
Explanation: In the given figure, the slotted lever is fixed and there are two sliders, hence it is a double slider crank chain, since the slotted plate is fixed, it is an inversion. This inversion is known as elliptical trammels.
5 - Question
In the given figure if P is not the midpoint of the line connecting 1 and 2, what is the locus of P?
a) Ellipse
b) Straight line
c) Parabola
d) Rectangular hyperbola
View Answer
Answer: a
Explanation: The given figure represents an elliptical trammel, in an elliptical trammel any point on the bar traces a path which is an ellipse, hence the locus of P is ellipse.
6 - Question
In the given figure if P is the midpoint of the line connecting 1 and 2, what is the locus of P?
a) Ellipse
b) Circle
c) Parabola
d) Rectangular hyperbola
View Answer
Answer: b
Explanation: The given figure represents an elliptical trammel, in an elliptical trammel any point on the bar traces a path which is an ellipse, hence the locus of P is ellipse, but in this case P is the midpoint hence, the locus of P will be a circle.
7 - Question
Which of the mechanism is used to convert rotary motion into a reciprocating motion?
a) Elliptical trammel
b) Scotch yoke mechanism
c) Oldham’s coupling
d) Gnome engine
View Answer
Answer: b
Explanation: Scotch yoke mechanism is an example of an inversion of a double slider crank chain, this mechanism is used to convert rotary motion into reciprocating motion.
8 - Question
In Scotch yoke mechanism, the crank is fixed in order to obtain the inversion.
a) True
b) False
View Answer
Answer: b
Explanation: In scotch yoke mechanism there are in total 4 links, one is Crank and one is frame. Inversion can be obtained by fixing either of the remaining two links.
9 - Question
Which of the following mechanism is used for connecting two parallel shafts whose axes are at a small distance apart?
a) Elliptical trammel
b) Scotch yoke mechanism
c) Oldham’s coupling
d) Gnome engine
View Answer
Answer: c
Explanation: Oldham’s coupling is an instrument which is an inversion of double slider crank chain, this is used to connect two parallel shafts whose axes are at a small distance apart.
10 - Question
Which of the following link is fixed to obtain inversion in Oldham’s coupling?
a) Driving shaft
b) Flange
c) Supporting frame
d) Driven shaft
View Answer
Answer: c
Explanation: The shafts are coupled in such a way that if one shaft rotates, the other shaft also rotates at the same speed. This inversion is obtained by fixing the link which corresponds to Supporting frame.
11 - Question
How many turning pairs are there in a double slider crank chain?
a) 1
b) 2
c) 3
d) 4
View Answer
Answer: b
Explanation: Double slider crank chain is a kinematic chain which consists of two turning pairs, as a result it is called double slider crank chain.
12 - Question
A double slider crank chain has one pair of each sliding and turning pairs.
a) True
b) False
View Answer
Answer: b
Explanation: In a double slider crank chain, there are two turning pairs and two sliding pairs. In a single slider crank chain there is one sliding pair and three turning pairs.
13 - Question
How many sliding pairs are there in a double slider crank chain?
a) 1
b) 2
c) 3
d) 4
View Answer
Answer: b
Explanation: Double slider crank chain is a kinematic chain which consists of two sliding pairs, as a result it is called double slider crank chain.
14 - Question
In which of the following mechanisms inversion is obtained by fixing the cylinder?
a) Pendulum pump
b) Gnome engine
c) Double slider crank chain
d) Oscillating cylinder
View Answer
Answer: a
Explanation: Pendulum pump also known as the bull engine is an inversion of single slider crank chain, here inversion is obtained by fixing the cylinder.
15 - Question
Which of the following is not an inversion of double slider crank chain?
a) Elliptical trammels
b) Scotch yoke mechanism
c) Oldham’s coupling
d) Gnome engine
View Answer
Answer: d
Explanation: Gnome engine is an example of inversion of single slider crank chain, whereas Elliptical trammels, Scotch yoke mechanism and Oldham’s coupling are inversions of double slider crank chain.