Theory of Machine
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
Force-closed pair
Lower pair
Self-closed pair

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

The Ackerman steering gear consists of turning pairs
The Ackerman steering gear is most economical
Both (A) and (B)
Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels

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Theory of Machine
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 constant amplitude
Oscillate with decreasing amplitude
Return to equilibrium position without oscillation
Oscillate with increasing time period

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