Angle of ascent of cam is defined as the angle
A. During which the follower returns to its initial position
B. Of rotation of the cam for a definite displacement of the follower
C. Through which the cam rotates during the period in which the follower remains in highest position
D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
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Angle of descent of cam is defined as the angle
A. During which the follower returns to its initial position
B. Of rotation of the cam for a definite displacement of the follower
C. Through which the cam rotates during the period in which the follower remains in the highest position
D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
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Angle of dwell of cam is defined as the angle
A. During which the follower returns to its initial position
B. Of rotation of the cam for definite displacement of the follower
C. Through which the cam rotates during the period in which the follower remains in the highest position
D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
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Cam angle is defined as the angle
A. During which the follower returns to its initial position
B. Of rotation of the cam for a definite displacement of the follower
C. Through which, the cam rotates during the period in which the follower remains in the highest position
D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
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A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a
A. Structure
B. Mechanism
C. Kinematic chain
D. Inversion
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The relation between number of links (l ) and number of joints (j) in a kinematic chain is
A. l = 2 1 ( j + 2 )
B. l = 3 2 ( j + 2 )
C. l = 4 3 ( j + 3 )
D. l = j + 4
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The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be
A. To raise the bow and stern
B. To lower the bow and stern
C. To raise the bow and lower the stern
D. To raise the stern and lower the bow
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When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be
A. To move the ship towards starboard
B. To move the ship towards port side
C. To raise the bow and lower the stern
D. To raise the stern and lower the bow
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Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts?
A. Theory of machines
B. Applied mechanics
C. Mechanisms
D. Kinetics
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In a steam engine, the link constitutes a
A. Piston, piston rod and cross-head
B. Connecting rod with big and small end brasses, caps and bolts
C. Crank pin, crankshaft and flywheel
D. All of the above
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The component of the acceleration, parallel to the velocity of the particle, at the given instant is called
A. Radial component
B. Tangential component
C. Coriolis component
D. None of these
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The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called
A. Radial component
B. Tangential component
C. Coriolis component
D. None of these
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The two elements of a pair are said to form a _________ when they permit relative motion between them.
A. Open pair
B. Kinematic pair
C. Sliding pair
D. None of these
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The primary unbalanced force is maximum _________ in one revolution of the crank.
A. Twice
B. Four times
C. Eight times
D. Sixteen times
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The secondary unbalanced force is maximum __________ in one revolution of the crank.
A. Two times
B. Four times
C. Eight times
D. Sixteen times
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Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts?
A. Theory of machines
B. Applied mechanics
C. Mechanisms
D. Kinetics
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If some links are connected such that motion between them can take place in more than one direction, it is called
A. Incompletely constrained motion
B. Partially constrained motion
C. Completely constrained motion
D. Successfully constrained motion
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The frequency of oscillation of a torsional pendulum 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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The unbalanced force due to reciprocating 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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