Related Questions
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If the damping factor for a vibrating system is unity, then the system will be
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4
Hart mechanism has
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Cylindrical cams can be classified as
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In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.
B. Directly proportional to
C. Inversely proportional to
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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
In a hydrodynamic journal bearing, there is
A. A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
B. A thick film of lubricant between the journal and the bearing
C. No lubricant between the journal and the bearing
D. A forced lubricant between the journal and the bearing
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4
The advantage of the piston valve over the slide valve is that in the former case
B. Power absorbed is less
C. Both wear and power absorbed are low
D. The pressure developed being high provides tight sealing
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A kinematic chain is known as a mechanism when
A. None of the links is fixed
B. One of the links is fixed
C. Two of the links are fixed
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Effort of a governor is the
A. Mean force exerted at the sleeve for a given percentage change of speed
B. Workdone at the sleeve for maximum equilibrium speed
C. Mean force exerted at the sleeve for maximum equilibrium speed
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4
The unbalanced force due to revolving masses
A. Varies in magnitude but constant in direction
B. Varies in direction but constant in magnitude
C. Varies in magnitude and direction both
D. Constant in magnitude and direction both
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4
If there are L number of links in a mechanism, then number of possible inversions is equal to
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The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is
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If the number of links in a mechanism is equal to l, then the numbers of possible inversions are equal to
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When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
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4
The critical speed of a shaft depends upon its
D. Stiffness and eccentricity
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The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)
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Which of the following is an open pair?
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The two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as
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Inertia force acts
A. Perpendicular to the acceleration force
B. Along the direction of acceleration force
C. Opposite to the direction of acceleration force
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It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by
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The maximum efficiency of a screw jack is
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The sense of Coriolis component is such that it
A. Leads the sliding velocity vector by 90°
B. Lags the sliding velocity vector by 90°
C. Is along the sliding velocity vector
D. Leads the sliding velocity vector by 180°
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4
The number of centers in a crank driven slider crank mechanism is
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An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the
A. Tip of the gear tooth and flank of pinion
B. Tip of the pinion and flank of gear
C. Flanks of both gear and pinion
D. Tip of both gear and pinion
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The coriolis component of acceleration depends upon
B. Angular velocity of the link
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In a four stroke I.C. engine, the turning moment during the compression stroke is
C. Positive during major portion of the stroke
D. Negative during major portion of the stroke
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If the controlling force line for a spring controlled governor when produced intersects the Y-axis at the origin, then the governor is said to be
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The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
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The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.
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When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.