THEORY OF MACHINE QUIZ

In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

Cause withdrawing or throttling of steam

Reduce maximum opening of port to steam

Reduce length of effective stroke of piston

All of these

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In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The distance between fixed pivots of crank and followers is

Slightly less than 95 mm

95 mm

Slightly more than 95 mm

45 mm

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The ratio of the driving tensions for V-belts is __________ times that of flat belts.(Where β = Semi-angle of the groove)

cosecβ

secβ

sinβ

cosβ

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Power of a governor is the

Mean force exerted at the sleeve for maximum equilibrium speed

Mean force exerted at the sleeve for a given percentage change of speed

None of these

Work-done at the sleeve for maximum equilibrium speed

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The example of completely constrained motion is a

Motion of a piston in the cylinder of a steam engine

Motion of a shaft with collars at each end in a circular hole

All of these

Motion of a square bar in a square hole

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Cross head and guides form a

Sliding pair

Turning pair

Higher pair

Lower pair

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Critical damping is a function of

Damping coefficient and natural frequency

Mass and stiffness

Mass and natural frequency

Mass and damping coefficient

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The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as

Turning pair

Rolling pair

Spherical pair

Sliding pair

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A pulley and belt in a belt drive form a

Rolling pair

Turning pair

Sliding pair

Cylindrical pair

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The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

Increases

Remain same

None of these

Decreases

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