Related Questions
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4
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the
A. Magnitude of the forces on journal
B. Angular velocity of journal
C. Clearance between journal and bearing
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4
Torsional vibrations are said to occur when the particles of a body moves
A. Perpendicular to its axis
C. In a circle about its axis
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4
If the opposite links of a four bar linkage are equal, the links will always form a
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4
A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is
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4
In S.H.M., acceleration is proportional to
C. Rate of change of velocity
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4
Which of the following statement is correct for involute gears?
A. The interference is inherently absent.
B. The variation in centre distance of shafts increases radial force.
C. A convex flank is always in contact with concave flank.
D. The pressure angle is constant throughout the teeth engagement.
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4
For simple harmonic motion of the of follower, a cosine curve represents
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4
A mechanism is an assemblage of
C. Four or more than four links
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A circle passing through the pitch point with its center at the center of cam axis is known as
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The acceleration of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by
A. ω². (r₁ r₂). (1 - cos² θ)
B. ω². (r₁ + r₂). (1 + cos² θ)
C. ω². (r₁ + r₂). [(2 - cos² θ)/cos³ θ]
D. ω². (r₁ - r₂). (1 - sin² θ)
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4
The frictional torque transmitted by a cone clutch is same as that of
D. Truncated conical pivot bearing
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A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of
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4
A single degree of freedom system is given by, m × (d²x/dt²) + c × (dx/dt) + sx = F.cosω.t with usual notations. It represents
A. Free vibration with damping
B. Free vibration without damping
C. Forced vibration with damping
D. Forced vibration without damping
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4
The coriolis component of acceleration exists whenever a point moves along a path that has
C. Gravitational acceleration
D. Tangential acceleration
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4
A slider crank chain consists of following numbers of turning and sliding pairs
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In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to
C. Ensure uniform loading
D. Ensure proper alignment
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4
The stress induced in a body will be shear stress, when it is subjected to
A. Longitudinal vibrations
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In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, if N coincides with O, then
A. Acceleration and velocity of the piston P is zero
B. Acceleration and velocity of the piston P is maximum
C. Acceleration of the piston P is zero and its velocity is maximum
D. Acceleration of the piston P is maximum and its velocity is zero
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4
Which of the following is an example of a higher pair?
C. Ball and roller bearing
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The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
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The example of lower pair is
A. Shaft revolving in a bearing
B. Straight line motion mechanisms
C. Automobile steering gear
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Kinematic pairs are those which have
A. Point or line contact between the two elements when in motion
B. Surface contact between the two elements when in motion
C. Elements of pairs not held together mechanically
D. Two elements that permit relative motion
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4
The motion between a pair which takes place in __________ is known as incompletely constrained motion.
C. More than one direction
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The number of centers in a crank driven slider crank mechanism is
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The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is
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The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the
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The two elements of a pair are said to form a _________ when they permit relative motion between them.
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Rectilinear motion of piston is converted into rotary by
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A point on a connecting link (excluding end points) of a double slider crank mechanism traces a
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In a rigid link OA, velocity of A w.r.t. O will be