Dynamics
Lab Viva questions
1. What
is meant by mechanism?
a system of parts
working together in a machine; a piece of machinery.
2. Define
Machine.
A machine is a device which receives
energy in some available form and utilizes it to some particular type of work.
3. Define
Dynamics of Machines.
It
deals with the study of forces acting on the parts of a machines.
4. What
is meant by slider crank mechanism?
The Slider-crank mechanism is used to
transform rotational motion into translational motion by means of a rotating
driving beam, a connection rod and a sliding body.
5. What
is your aim of the experiment?
To find out the slider velocity and
angular velocity of the experiment.
6. Applications
of slider crank mechanism?
7. What is meant by velocity?
the speed of something in a given direction.
8. What is meant by angular
acceleration?
Angular acceleration, also
called rotational acceleration,
is a quantitative expression of the change in angular velocity that a spinning object
undergoes per unit time. It is a vector quantity, consisting of a magnitude
component and either of two defined directions or senses.
9. What
is meant by beam?
Beams are generally horizontal structural members which transfer
loads horizontally along their length to the supports where the loads are
usually resolved into vertical forces. Beams are used for resisting vertical loads,
shear forces and bending moments
10. What
are the types of beam?
a. Simply Supported Beam
b. Fixed Beam
c. Cantilever Beam
d. Continuously Supported Beam
11. What are the types of Loading?
a. Point load
b. Uniformly distributed load
c. Uniformly varying load
12. What Is the aim of experiment?
To
find the natural efficiency of the beam.
13. What is meant by natural frequency?
the frequency at
which a system oscillates when not subjected to a continuous or repeated
external force.
14. What is meant by frequency?
It is defined as
the number of cycles per second.
15. What is the unit of frequency?
The SI unit of frequency is the hertz (Hz), named after the German physicist
Heinrich Hertz. One hertz means that an event repeats once per
second. A previous name for this unit was cycles per second (cps). The SI unit for period is the second.
16. What is the use of cam?
A cam is a rotating or sliding piece in a
mechanical linkageused especially
in transforming rotary motion into linear motion or vice versa.
17. What is meant by camp jump phenomenon?
Follower looses
contact with cam surface when cam rotates beyond particular speed due to
inertia forces
18. What are types of cam?
a. Wedge or flat cams
b. Radial or Disc Cams
c. Spiral cams
d. Cylindrical cams
e. Conjugate cams
f.
Globoidal
Cams
g. Spherical cams
19.
What
are the types of follower available?
a. (a) Knife edge follower
b. (b) Roller follower
c. (c) Flat faced follower
d. (d) Spherical follower
20. What is the aim of this experiment?
jump-speed characteristics of the cam & follower mechanism.
21. What is meant by governor?
Governors
are also known as speed limiters; they are used in different places like
engines to measure and regulate the speed of an engine.
22. What are types
of governors?
a. Watt governor
b. Porter governor
c. Proell governor
d.
Hartnell
governor
23. What is meant by stiffness of spring?
For an
elastic body with a single degree of freedom (DOF) (for example, stretching or
compression of a rod), the stiffness is defined as k = F δ {\displaystyle k={\frac
{F}{\delta }}} ... δ is the displacement produced by the force along the same
degree of freedom (for instance, the change in length of a stretched spring).
24. What is meant by sensitivity of governor?
Sensitivity is definedas
the ratio of the mean speed to the speed range of the governor over its limits of operation.
25. What are classification of governors?
Generally
Governors can be classified as either Centrifugal orInertia.
26. What is meant by centrifugal governor?
The
effort of the governor is obtained from the change in centrifugal force on
(usually) two rotating masses known as Balls,
when an increase or decrease in governor speed occurs.
27. What is meant by inertia governors?
Inertia Governors work on a different principle. The governor balls are
arranged so that the inertia forces caused by angular acceleration or
retardation of the governor shaft tend to alter their positions. The amount of
the displacement of the balls is controlled by springs and the governor
mechanism to alter the supply of energy to the engine.
28. What is meant by gyroscope?
a
device consisting of a wheel or disc mounted so that it can spin rapidly about
an axis which is itself free to alter in direction. The orientation of the axis
is not affected by tilting of the mounting, so gyroscopes can be used to
provide stability or maintain a reference direction in navigation systems,
automatic pilots, and stabilizers.
29. What is meant by gyroscope couple?
Gyroscopic
Couple. If a uniform disc of polar moment
of inertia is rotated about its axis with an angular velocity , its Angular
Momentum is a vector and can be represented in diagram (c) by the line up which
is drawn in the direction of the axis of rotation.
30. What is the use of gyroscope couple?
Gyroscopes
can be very perplexing objects because they move in peculiar ways and even seem
to defy gravity. These special properties make gyroscopes extremely important
in everything from your bicycle to the advanced navigation system on the space shuttle. A
typical airplane uses about a dozen gyroscopes in everything from its compass to its autopilot. The Russian Mir space station used 11
gyroscopes to keep its orientation to the sun, and the Hubble
Space Telescope has a batch of
navigational gyros as well.
31. What is meant by centrifugal force?
a
force, arising from the body's inertia, which appears to act on a body moving in
a circular path and is directed away from the centre around which the body is
moving.
32. What is meant by moment of inertia?
a
quantity expressing a body's tendency to resist angular acceleration, which is
the sum of the products of the mass of each particle in the body with the
square of its distance from the axis of rotation.
33. What is meant by whirling of shaft?
Whirling speed is also called as Critical speed of ashaft. It
is defined as the speed at which a rotatingshaft will tend to vibrate violently in the
transverse direction if the shaft rotates in horizontal direction. In
other words, the whirling or critical speed is the speed at
which resonance occurs.
34. What is meant by flywheel?
A flywheel is a rotating mechanical device that
is used to store rotational energy.
Flywheels have an inertia
called the moment of inertia and thus resist changes in rotational speed. The
amount of energy stored in a flywheel is proportional to the square of its
rotational speed.
35. What
do you mean by inertia?
The property of matter
offering resistance to any change of its state of rest or of uniform motion in
a straight line is known as inertia.
36. What is meant by axisymmetric?
symmetrical
about an axis.
37. What is meant by degree of freedom?
In
statistics, the number of degrees of freedom
is the number of values in the final calculation of a statistic that are free
to vary. The number of independent ways by which a dynamic system can move,
without violating any constraint imposed on it, is called number of degrees of freedom.
38. What is meant by gear?
a toothed wheel that
works with others to alter the relation between the speed of a driving
mechanism (such as the engine of a vehicle) and the speed of the driven parts
(the wheels).
39. What is meant by gear ratio?
The
Gear Ratio is defined as the input speed relative to the output
speed.
40. What is meant by gear train?
a system of gears which
transmits motion from one shaft to another.
41. What is meant by radius of gyration?
the
distance from an axis at which the mass of a body may be assumed to be
concentrated and at which the moment of inertia will be equal to the moment of
inertia of the actual mass about the axis, equal to the square root of the
quotient of the moment of inertia and the mass.
42. What is meant by balancing of rotating mass?
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43. What is meant by mechanism?
When one of the links
of a kinematics chain is fixed, the chain is known as mechanism. It may be used
for transmitting or transforming motion e.g. engine indicators, typewriter etc.
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