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Theory of machines
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Theory of machines
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In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is
less than 2
equal to one
greater than 2
equal to 2
The maximum fluctuation of energy is the
sum of the maximum and minimum energies
ratio of the mean resisting torque to the workdone per cycle
variations of energy above and below the mean resisting torque line
difference between the maximum and minimum energies
When a point moves along a straight line, its acceleration will have
coriolis component only
tangential component only
radial component only
radial and tangential components both
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as
compound pendulum
Simple Pendulum
torsional pendulum
second's pendulum
In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from
10° - 15°
30° - 40°
25° - 30°
15° - 25°
When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will
oscillate with increasing time period
oscillate with constant amplitude
oscillate with decreasing amplitude
return to equilibriumposition without oscillation
A mechanism is an assemblage of
four or more than four links
two links
three links
All of These
When a body is subjected to transverse vibrations, the stress induced in a body will be
tensile stress
shear stress
compressive, stress
bending stress
Which of the following statement is correct for involute gears
The variation in centre distance of shafts increases radial force.
The interference is inherently absent.
A convex flank is always in contact with concave flank.
The pressure angle is constant throughout the teeth engagement.
The maximum fluctuation of speed is the
difference of the maximum and minimum speeds
difference of minimum fluctuation of speed and the mean speed
variations of speed above and below the mean resisting torque line
sum of maximum and minimum speeds
When the particles of a body moves perpendicular to its axis, then the body is said to have
longitudinal vibration
transverse vibration
torsional vibration
NONE OF THESE
Which of the following is an open pair
Cam and follower
Ball and socket joint
Lead screw and nut
Journal bearing
When the sleeve of a Porter governor moves upwards, the governor speed
Increases
Decreases
remains unaffected
first increases and then decreases
If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be
same as the first one
four times the first one
one and a half times the first one
one fourth of the first one
At the nodal point in a shaft, the amplitude for torsional vibration will be
maximum
Infinity
Minimum
Zero
For dynamic balancing of a shaft
Both (a) and (b)
None of the above
the net couple due to the dynamic forces acting on the shaft is equal to zero
the net dynamic force acting on the shaft is equal to zero
The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r1 = Minimum radius of the cam, r2 = Radius of the roller follower, and θ = Angle turned by the cam from the beginning of the follower displacement)
(r1 + r2)
(r1 - r2)
(r1 + r2)(1 + cos θ)
(r1 - r2)(1 - cosθ)
A spring controlled governor is said to be stable if the controlling force line when produced intersects the Y-axis
at the origin
above the origin
below the origin
any one of these
In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called
NONE OF THESE
exhaust lap
Lead
steam lap
An automobile steering gear is an example of
rolling pair
lower pair
sliding pair
higher pair
The component of the acceleration, parallel to the velocity of the particle, at the given instant is called
coriolis component
tangential component
NONE OF THESE
radial component
A disc is a spinning with an angular velocity ω rad/s about the axis ofspin.
The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and ωP = Angular velocity of precession of the axis of spin)
Iω2
IωωP
In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the trans-missibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)
equal to unity
greater than unity
Zero
less than unity
A slider moves at a velocity v on a link revolving at ω rad/s. The coriolis component of acceleration is
2 ωv2
ωv
2 ωv
ω2v
The Klein's method of construction for reciprocating engine mechanism
utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine
is based on the acceleration diagram
is a simplified version of instantaneous centre method
enables determination of coriolis component
For an involute gear, the ratio of base circle radius and pitch circle radius is equal to
sin φ
cos φ
sec φ
cosec φ
The angle of inclination of the plane, at which the body begins to move down the plane is called
Angle of friction
angle of repose
NONE OF THESE
Angle of projection
The relation between me number of links (l) and the number of binary joints (j) for a kinematic chain having constrained motion is given by l = l - 2. If the left hand side of this equation is greater than the right hand side, then the chain is
successfully constrained chain
locked chain
incompletely constrained chain
completely constrained chain
A friction circle is a circle drawn when a journal rotates in abearing.
Its radius depends upon the coefficient of friction and the
magnitude of the forces on journal
radius of journal
angular velocity of journal
clearance between journal and bearing
The ratio of the driving tensions for V-belts is __________ times that of flatbelts.
(where β = Semi-angle of the groove)
cos β
cosec β
sec β
sin β
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