When the primary direct crank of a reciprocating engine makes an angle of $$\theta $$ with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.
A. $$\frac{\theta }{2}$$
B. $$\theta $$
C. $$2\theta $$
D. $$4\theta $$
Answer: Option C
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