Secondary
forces in reciprocating mass on engine frame are
Of
same frequency as of primary forces
Twice the frequency as of primary forces
Four times the frequency as of primary forces
Half
the frequency as of primary forces
Twice the frequency as of primary forces
Secondary
forces: In every cycle of 180°, the piston moves from top to bottom or reverse.
The distance travelled by the piston is not uniform and this gives rise to
secondary forces. It occurs twice, every half rotation.
Hence,
the correct option is (B).
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