Questions and Answers Section 1

Questions and Answers

Question :

01. In a reciprocating steam engine,which of the following forms a kinematic link?

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Crankshaft and flywheel

Note:-Each resistant body in a machine which moves relative to another resistant body is called Kinematic link or element.

Question :

02.The maximum velocity of a particle moving with simple harmonic motion is

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ωr

Note:-oscillatory motion under a retarding force proportional to the amount of displacement from an equilibrium position.

Question :

03.When the tip of a tooth undercuts the root on its mating gear, it is known as 

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interference

Note:-When two gears are in mesh at one instant there is a chance to mate involute portion with non-involute portion of mating gear. This phenomenon is known as "interference" and occurs when the number of teeth on the smaller of the two meshing gears is less than a required minimum.

Question :

04.Under logarithmic decrement, the amplitude of successive vibrations are

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in geometric progression

Question :

05.In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is Constant, then

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crossed belt drive is recommended.

Question :

06.The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

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90° and 180°

Note:-Traction, or tractive force, is the force used to generate motion between a body and a tangential surface, through the use of dry friction, though the use of shear force of the surface is also commonly used.

Question :

07.A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

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Elliptical path

Note:-A small body in space orbits a large one (like a planet around the sun) along an elliptical path, with the large body being located at one of the ellipse foci. Two bodies with similar mass orbiting around a common barycenter with elliptic orbits.

Question :

08.According to Kennedy's theorem, if three bodies move relatively to each other, their instantaneous centres will lie on a

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straight line.




Question :

09.The periodic time is given by (where ω = Angular velocity of the particle in rad/s)

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2π/ω

Question :

10.When two links are connected by a pin joint, their instantaneous centre lies

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at the pin joint.