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WorksheetsTechnical Dynamics
Total questions: 50
Worksheet time: 2hrs 40mins
The direction of linear velocity of any point on a link with respect to another point on the same link is
parallel to the link joining the point
perpendicular to the link joining the points
at 45 degree to the link joining the points
none of the above
The direction of linear velocity of any point on a link with respect to another point on the same link is
angle of friction
angle of repose
angle of projection
In a screw jack, the effort required to lift load W is given by
P = W tan ( α - φ )
P = W tan ( α + φ )
P = W cos ( α - φ )
P = W cos ( α + φ )
The efficiency of screw jack is given by
tan ( α + φ ) / tan α
tan α / tan ( α + φ )
tan ( α - φ ) / tan α
tan α / tan ( α - φ )
The size of gear is usually specified by
pressure angle
circular pitch
diametral pitch
pitch circle diameter
The two parallel and co-planer shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is called
spur gearing
helical gearing
bevel gearing
spiral gearing
In a simple gear train, if the number of idle gear is odd, then the motion of driven gear will
be same as that of driving gear
be opposite to that of driving gear
depends upon the number of teeth on driving gear
none of the above
Maximum fluctuation of energy is the
sum of maximum and minimum energies
difference between the maximum and minimum energies
ratio of the maximum energy and minimum energy
ration of mean resisting torque to the work done per cycle
The height of watt's governor ( in meters ) is equal to
8.95/ N2
89.5/N2
895/N2
8590/N2
A Hartnell governor is
pendulum type governor
spring loaded governor
dead type governor
inertia governor
Size of cam depends on
base circle
pitch circle
prime circle
pitch curve
The cam follower generally used in automobile engine is
knife edge follower
flat faced follower
spherical faced follower
roller follower
In order to have a complete balance of the several revolving masses in different planes
the resultant force must be zero
the resultant couple must be zero
both resultant force and couple must be zero
none of the above
The type of coupling used to join two shafts whose axis are neither in same straight line nor parallel but intersect is
Flexible coupling
universal coupling
chain coupling
oldham's coupling
Creep in belt drive is due to
material of the pulley
material of the belt
lorger size of the driving pulley
uneven extension and contraction due to varying tension
pitch circle diameter of an involute gear
is independent of any other element
dependent on pressure angle
constant for a state of meshing gears
proportional to base diameter
Purpose of using differential gear in automobile is to
control speed
avoid jerks
help in turning
obtain rear movement
A porter governor could be classified as
inertia type governor
pendulum type governor
centrifugal type governor
dead weight type governor
The cam follower generally used in aircraft engine is
knife edge follower
flat faced follower
spherical faced follower
roller follower
In case of the flywheel, the maximum fluctuation of energy is the
ratio of the minimum and maximum energies
difference between the maximum and minimum energy levels
sum of the maximum and minimum energy levels
ratio of the maximum and minimum energies
The spring controlled governors as compared to gravity controlled governors or dead weight type governors
can operate at higher speed
fine tuning is possible in context with the change in speed limits i.e adjustment of maximum and minimum speeds
are more compact and smaller in size
all of the above
For a governor running at a constant speed, what is the value of the force acting on the sleeve?
zero
maximum
variable depending upon the load
minimum
The flywheel influences the
mean speed of the prime mover
mean torque developed by the prime mover
cyclic variation in speed of the prime mover
variation of load demand on the prime mover
The energy is stored and released by the flywheel in the form of
thermal energy
kinetic energy
potential energy
pressure energy
Kinematics of machines deals with
the relative motion between the elements, neglecting the forces causing the motion
the member of interrelated parts
apparatus for applying mechanical power
the forces acting on the machine parts
If the shortest link of a four bar chain mechanism is fixed then the mechanism obtained is
crank-crank or double crank mechanism
rocker- rocker or double lever mechanism
crank - lever mechanism
none of the above
Following is / are the inversions of a four bar chain mechanism
beam engine
Coupled wheels of a locomotive engine
Watt's engine indicator
all of the above
In order to have the smallest link of a four bar chain mechanism to revolve, the sum of lengths of the shortest and longest links should not be ............. the sum of the lengths of other two links
greater than
equal to
smaller than
none of the above
If one of the four links of a kinematic chain is made fixed, the resultant obtained is called
a mechanism
a structure
an element
none of the above
The motion between bolt and nut, shaft rotation in bearing, piston sliding inside the cylinder etc. is kind of
higher pair
lower pair
frictional pair
none of the above
In case of I C Engine, the angular velocity of the connecting rod is zero when the angle of the crank is
90 degree and 70 degree both with respect to IDC
180 degree with respect to IDC
270 degree with respect to IDC
90 degree with respect to IDC
During the analytical or graphical analysis of a slider crank chain mechanism, the crank angle is measured with reference to
outer dead center (ODC )
inner dead center ( IDC )
bottom dead center ( BDC )
top dead centre ( TDC )
The following mechanism/s is/ are used to convert rotary motion in to reciprocating motion
slider crank chain mechanism
cam and follower mechnism
crank and lever mechanism / beam engine
all of the above
The kinematic link is
any part of the machine
any resistant body which is capable of transmitting the required motion and forces with negligible deformation
only the fixed part of the machine
none of the above
the piston velocity becomes zero in a slider crank mechanism when crank reaches an angle of
90 degree with respect to IDC
180 degree with respect to IDC
270 degree with respect to IDC
none of the above
A ternary link is one in which
two links are joined together at the same connection
three links are joined together at the same connection
four links are joined together at the same connection
non of the above
During the dwell period of the follower
it does not move up or down but it remains wherever it is
moves with simple harmonic motion
moves in a straight line
moves with uniform velocity
if the balance mass is to be placed in a plane parallel to the plane of mass creating unbalance, then minimum number of balancing masses required are
three
four
one
two
A reciprocating engine, hand pump, withworth quick return are the inversions of
a single slider chain mechanism
a double slider chain mechanism
a four bar chain mechanism
none of the above
inertia force or dynamic force acts
perpendicular to the direction of and accelerating force
along any direction of and accelerating force
along the direction of and accelerating force
opposite to the direction of and accelerating force
cam and follower mechanism constitutes a following kind of kinematic pair
lower and open
higher and open
lower and closed
higher and closed
which type of the disc cam gives you a more lift with the same kind of roller follower ?
tangent cam
circular cam
off-set cam
none of the above
The angle between the line of stroke and the normal to the pitch curve at any point is called
profile angle
prime angle
pitch angle
pressure angle
The point on the cam profile with maximum pressure angle is called a
trace point
cam center
roller center
pitch point
The sensitivity of the governor due to frictional resistance at the sleeve
increases
decreases
depends on speed
remains same
The governor is and essential element while the flywheel is not in case of
a turbine
a reciprocating engine
a reciprocating compresor
none of the above
The amount of energy absorbed by a flywheel is given by
speed-energy diagram
torque-crank angle diagram
speed-space diagram
acceleration- crank angle diagram
The balancing of rotating and reciprocating parts of an engine is necessary when it runs at
slow speed
medium speed
high speed
For static balancing of a shaft
the net dynamic force acting on the shaft is equal to zero
the net couple due to dynamic force acting on the shaft is equal to zero
both 1 and 2 above
none of the above
Klein's construction is useful to determine
crank has a uniform angular velocity
crank has a non-uniform angular velocity
crank has uniform angular acceleration
crank has uniform angular velocity and angular acceleration
