WorksheetsKOM - Basics of Mechanism
Total questions: 25
Worksheet time: 25mins
The branch of mechanics which deals with only motions and not with the forces
STATIC
KINEMATICS
KINETICS
DYNAMICS
---------is a combination of rigid or restraining parts or bodies from which the machine is assembled.
MACHINE
STRUCTURE
MECHANISM
CONNECTING ROD
A---------- is again a combination of links connected to each other but no relative motion exists between them.
MACHINE
CONNECTING ROD
MECHANISM
STRUCTURE
If the relative motion between them is completely or successfully constrained then the pair is known as -------
rolling pair
kinematic pair
sliding pair
cylindrical pair
Example of rolling pair?
crankshaft
mirror in car
ball bearings
connecting rod
What is a mechanical advantage?
not using simple machines
making the task harder
using simple machines so the task is easier
An example of higher pair
car mirror
a shaft rotating in a bearing
a nut turning on a screw
cam and follower
Which type of mechanism is used on a bicycle?
Pulley
Gears
Rack and pinion
Chain and sprocket
Shaft with a collar at both ends revolving in a circular hole is a example of ____________ pair.
Prismatic Pair
Turning pair
Screw Pair
Spherical pair
The Screw pair is a combination of _________ and __________ pair.
Turning pair and Rolling pair
sliding pair and turning pair
sliding pair and Rolling pair
all the above
The ball and socket joint, attachment of a car mirror, pen stand are examples of __________ pair.
Spherical pair
Turning pair
Rolling pair
none of this
A mechanism with __________ links is known as simple mechanism,
TWO
FOUR
THREE
MORE THAN FOUR
A higher pair has__________.
Point contact
Surface contact
No contact
None of the above
When the kinematic pairs are coupled in such a way that the last link is joined to the first link to transmit definite motion (i.e. completely or successfully constrained motion), it is called a
kinematic chain
link
pair
mechanism
When the two elements of a pair have surface contact when relative motion takes place and the surface of one element slides over the surface of another element, the pair formed as lower pair, Say True or False
True
False
The relation between number of links and number of lower pairs is given as l = 2p – 4. If L.H.S is less than R.H.S of this equation then the chain is
constrained
unconstrained
locked
none of these
The Grubler’s equation is applicable to:
1 DOF Mechanisms
2 DOF Mechanisms
3 DOF Mechanisms
0 DOF Mechanisms
A four bar kinematic chain has ____ turning pairs
1
2
3
4
The relation between the number of pairs ( p ) forming a kinematic chain and the number of links (l) is
l = 2p – 2
l = 2p – 3
l = 2p – 4
l = 2p – 5
In a kinematic chain, a quaternary joint is equivalent to
one binary joint
two binary joints
three binary joints
four binary joints
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
The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
0
1
2
-1
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
three are turning pairs and one is sliding pair
each of the four pairs is a sliding pair.
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
Which of the following is an inversion of double slider crank chain ?
Coupling rod of a locomotive
Pendulum pump
Elliptical trammels
Oscillating cylinder engine
