The crank and slotted lever quick-return motion mechanism is shown in Fig.48. The length of links (O_{1}

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The crank and slotted lever quick-return motion mechanism is shown in Fig.48. The length of links \(O_{1} O_{2}, O_{1} C\) and \(O_{2} A\) are \(10 \mathrm{~cm}, 20 \mathrm{~cm}\) and \(5 \mathrm{~cm}\) respectively.

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The quick return ratio of the mechanism is

(a) 3.0

(b) 2.75

(c) 2.0

(d) 0 .

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