# Equal speeds condition when driving & driven shafts connected by Hooks joint - Theory of Machines - 1

**Q. Which relation is used to denote condition for equal speeds, when driving and driven shafts are connected by Hook's joint?***- Published on 06 Aug 15***a.** tan θ = ± √cos α

**b.** tan θ = ± √cot α

**c.** tan θ = ± √sin α

**d.** cot θ = ± √cos α

**ANSWER: tan θ = ± √cos α**