THEORY OF MACHINE QUIZ

Cam angle is defined as the angle

Of rotation of the cam for a definite displacement of the follower

During which the follower returns to its initial position

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

Through which, the cam rotates during the period in which the follower remains in the highest position

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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

Higher pair

Lower pair

Self-closed pair

Force-closed pair

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The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

(ω₁ - ω₂) 2r

(ω₁ + ω₂) r

(ω₁ - ω₂) r

ω₁.ω₂.r

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When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a

Self-closed pair

Lower pair

Force-closed pair

Higher pair

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Transmission angle is the angle between

Output link and fixed link

Input link and coupler

Output link and coupler

Input link and fixed link

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Balancing of rotating and reciprocating parts of an engine is necessary when it runs at

Moderate speed

Highs peed

Slow speed

Any one of these

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In S.H.M., acceleration is proportional to

Displacement

All of these

Rate of change of velocity

Velocity

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Which one of the following can completely balance several masses revolving in different planes on a shaft?

Two masses in any two planes

A single mass in different planes

A single mass in one of the planes of the revolving masses

Two equal masses in any two planes

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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

Oscillate with decreasing amplitude

Oscillate with constant amplitude

Return to equilibrium position without oscillation

Oscillate with increasing time period

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The example of higher pair is

Ball and roller bearings

All of these

Belt, rope and chain drives

Gears, cams

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