1. All harmonic farces, except those which are multiples of half the number of cylinders, are balanced. |
2. Couples are balanced if the engine is symmetrical about a plane normal to the axis of the cranks shaft. |
3. In a four cylinder in-line engine, second and fourth harmonic forces are unbalanced whereas in a six cylinder in-line engine, second fourth and sixth harmonic forces are unbalanced. |
A) 1, 2 and 3 are correct
B) 1 and 3 are correct
C) 1 and 2 are correct
D) 2 and 3 are correct
Correct Answer: A
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