Question

For the four bar mechanism shown in figure, the transmission angle for the given position is

• A. ${60}^{\circ }$
• B. ${90}^{\circ }$
• C. ${30}^{\circ }$
• D. $0^{\circ }$

Answer 1

The correct option is A ${60}^{\circ }$


$\mu$ is the transmission angle

AB = 60 mm,

BC = 120 mm,

CD = 120 mm

In triangle BCE

BC = 120

CE = CD - ED

= 120-60 = 60 mm

$\cos \mu =\frac{CE}{BC}=\frac{60}{120}=\frac{1}{2}$

$\mu ={60}^{\circ }$