For the secondary balancing of the engine, which of the condition is necessary?
A. Secondary force polygon must be close
B. Secondary force polygon must be open
C. Primary force polygon must be close
D. Primary force polygon must be open
Answer:A
For the secondary balancing of the engine, which of the condition is necessary?
A. Secondary force polygon must be close B. Secondary force polygon must be open C. Primary force polygon must be close D. Primary force polygon must be open