Related Questions
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4
The indicator using Watt mechanism is known as
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The Whitworth quick return motion mechanism is formed in a slider crank chain when the
B. Longest link is a fixed link
C. Slider is a fixed link
D. Smallest link is a fixed link
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4
An automobile steering gear is an example of
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Which of the following mechanism is an approximate straight line motion mechanism?
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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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4
The two elements of a pair are said to form a _________ when they permit relative motion between them.
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To obviate axial thrust, following gear drive is used
A. Double helical gears having opposite teeth
B. Double helical gears having identical teeth
C. Single helical gear in which one of the teeth of helix angle a is more
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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. The acceleration of the piston P with respect to the crankpin C is given by
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Oldhams coupling is an inversion of the kinematic chain used in
A. Whitworth quick return mechanism
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When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will
A. Return to equilibrium position without oscillation
B. Oscillate with increasing time period
C. Oscillate with decreasing amplitude
D. Oscillate with constant amplitude
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4
When a point moves along a straight line, its acceleration will have
B. Tangential component only
C. Coriolis component only
D. Radial and tangential components both
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Which of the following statement is correct?
A. The primary unbalanced force is less than the secondary unbalanced force.
B. The primary unbalanced force is maximum twice in one revolution of the crank.
C. The unbalanced force due to reciprocating masses varies in magnitude and direction both.
D. The magnitude of swaying couple in locomotives is inversely proportional to the distance between the two cylinder centre lines
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4
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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4
When the crank is at the inner dead centre, in a reciprocating steam engine, then the acceleration of the piston will be
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The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called
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3.The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)
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The Coriolis component of acceleration acts
A. Along the sliding surface
B. Perpendicular to the sliding surface
C. At 45° to the sliding surface
D. Parallel to the sliding surface
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Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?
D. Meyer's expansion valve
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A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will
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4
A system of masses rotating in different parallel planes is in dynamic balance if the
A. Resultant force is equal to zero
B. Resultant couple is equal to zero
C. Resultant force and resultant couple are both equal to zero
D. Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
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The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
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Which of the following is an open pair?
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In order to give a complete secondary balance of a multi-cylinder inline engine,
A. The algebraic sum of the secondary forces must be equal to zero
B. The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
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The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)
C. (1 - c).m.ω².r (cosθ - sinθ)
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Which of the following statement is correct for gears?
A. The addendum is less than the dedendum
B. The pitch circle diameter is the product of module and number of teeth
C. The contact ratio means the number of pairs of teeth in contact
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The pair is known as a higher pair, when the relative motion between the elements of a pair is
D. Partly turning and partly sliding
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The number of centers in a crank driven slider crank mechanism is
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When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be
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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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In an ideal machine, the output as compared to input is
D. May be less or more depending on efficiency