Theory of Machine
In involute gears, the pressure angle is

Dependent on the size of gears
Always constant
Dependent on the size of teeth
Always variable

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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

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

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