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In a mechanism, the fixed instantaneous centres are those centres which
A. Remain in the same place for all configurations of the mechanism
B. Vary with the configuration of the mechanism
C. Moves as the mechanism moves, but joints are of permanent nature
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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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Longitudinal 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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The product of the diametral pitch and circular pitch is equal to
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The relation l = (2/3).(j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to
A. One lower pair and two additional links
B. Two lower pairs and one additional link
C. Two lower pairs and two additional links
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The purpose of a link is to
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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
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The lower pair is a
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In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called
B. Maximum fluctuation of energy
C. Coefficient of fluctuation of energy
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Rectangular bar in a rectangular hole is the following type of pair
A. Completely constrained motion
B. Partially constrained motion
C. Incompletely constrained motion
D. Freely constrained motion
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V-belts are usually used for
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When brakes are applied to all the four wheels of a moving car, the distance travelled by the car before it is brought to rest, will be
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The steering of a ship means
A. Movement of a complete ship up and down in vertical plane about transverse axis
B. Turning of a complete ship in a curve towards right or left, while it moves forward
C. Rolling of a complete ship sideways
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The radial distance of a tooth from the pitch circle to the bottom of the tooth is called
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With single Hooke's joint it is possible to connect two shafts, the axes of which have an angular misalignment up to
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The locus of a point on a thread unwound from a cylinder will be
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In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)
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There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is
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The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.
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A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by
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When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a
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The sensitiveness of the governor __________ as the speed range decreases.
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Which is the false statement about the properties of instantaneous centre?
A. At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered
B. The two rigid links have no linear velocities relative to each other at the instantaneous centre
C. The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link
D. The double centre can be denoted either by O2 or O12, but proper selection should be made
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The maximum frictional force, which comes into play, when a body just begins to slide over the surface of the other body, is known as
D. Coefficient of friction
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The Klein's method of construction for reciprocating engine mechanism
A. Is a simplified version of instantaneous centre method
B. Utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine
C. Enables determination of coriolis component
D. Is based on the acceleration diagram
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If the damping factor for a vibrating system is unity, then the system will be
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The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)
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In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is
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The power transmitted by a belt is maximum when the maximum tension in the belt is _________ of centrifugal tension.
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The frequency of oscillation of a torsional pendulum is