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1. Determine the mobility of the mechanism b) m 1 c)m=2 d) m 3 e) None of the ab

ID: 2073742 • Letter: 1

Question

1. Determine the mobility of the mechanism b) m 1 c)m=2 d) m 3 e) None of the above 2. How many Ji pairs exist in the mechanism below? d) 12 e) None of the above 3. A lower pair variable has: a) 1 Degree of Freedom, 1 degree of Constraint b) 2 Degrees of Freedom, 1 degree of Constraint c) 2 Degrees of Freedom, 2 degrees of Constraint d) 1 Degree of Freedom, 2 degrees of Constraint e) None of the above 4. A link attached to three kinematic pairs is known as a a) Binary Link b) Triple Link c) Ternary Link d) Trinary Link e) None of the above

Explanation / Answer

1) DOF = 3(n-1)-2j1-j2

since the function of the mechanism is not affected by three parallel link if one of them removed

hence effective no of link n= 4

j1 = 4 j2=0

then

DOF = 3(4-1)-2x4-0

DOF = 1

ans (b) m=1

2)since one ternary joint equivelent to two binary joint then we have 4 ternary joint

thus

j1 = 2*4

j1 = 8

ans (c) 8

3) (d) 1 degree of freedom , 2 degree of constraints

4) (c) Ternary link