Simple Mechanisms

Question 1
Marks : +2 | -2
Pass Ratio : 100%
In a kinematic chain, a quaternary joint is equivalent to
one binary joint
two binary joints
three binary joints
four binary joints
Explanation:
When four links are joined at the same connection, the joint is called a quaternary joint. It is equivalent to three binary joints.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is an inversion of single slider crank chain ?
Beam engine
Watt’s indicator mechanism
Elliptical trammels
Whitworth quick return motion mechanism
Explanation:
None
Question 3
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:
When n = 0, then the mechanism forms a structure and no relative motion between the links is possible.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The relation between the number of links (l) and the number of binary joints ( j) for a kinematic chain having constrained motion is given by j = 3/2 I -2 If the left hand side of this equation is greater than right hand side, then the chain is
locked chain
completely constrained chain
successfully constrained chain
incompletely constrained chain
Explanation:
If the left hand side is greater than the right hand side, therefore it is not a kinematic chain and hence no relative motion is possible. Such type of chain is called locked chain and forms a rigid frame or structure which is used in bridges and trusses.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The lead screw of a lathe with nut forms a
sliding pair
rolling pair
screw pair
turning pair
Explanation:
When the two elements of a pair are connected in such a way that one element can turn about the other by screw threads, the pair is known as screw pair. The lead screw of a lathe with nut, and bolt with a nut are examples of a screw pair.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
In a reciprocating steam engine, which of the following forms a kinematic link ?
cylinder and piston
piston rod and connecting rod
crank shaft and flywheel
flywheel and engine frame
Explanation:
in a reciprocating steam engine, piston, piston rod and crosshead constitute one link ; connecting rod with big and small end bearings constitute a second link ; crank, crank shaft and flywheel a third link and the cylinder, engine frame and main bearings a fourth link.
Question 7
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
all of the links are fixed
Explanation:
When one of the links of a kinematic chain is fixed, the chain is known as mechanism. It may be used for transmitting or transforming motion e.g. engine indicators, typewriter etc.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is an inversion of double slider crank chain ?
Coupling rod of a locomotive
Pendulum pump
Elliptical trammels
Oscillating cylinder engine
Explanation:
A kinematic chain which consists of two turning pairs and two sliding pairs is known as double slider crank chain and elliptical trammels are such pairs.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
In a 4 – bar linkage, if the lengths of shortest, longest and the other two links are denoted by s, l, p and q, then it would result in Grashof’s linkage provided that
l + p < s + q
l + s < p + q
l + p = s + q
none of the mentioned
Explanation:
None
Question 10
Marks : +2 | -2
Pass Ratio : 100%
The motion transmitted between the teeth of gears in mesh is
sliding
rolling
may be rolling or sliding depending upon the shape of teeth
partly sliding and partly rolling
Explanation:
When the two elements of a pair have a line or point contact when relative motion takes place and the motion between the two elements is partly turning and partly sliding, and in mesh the gears have a point contact.