In reciprocating engines primary forces _________.
  • a)
    Are completely balanced
  • b)
    Are partially balanced
  • c)
    Are balanced by secondary forces
  • d)
    Cannot be balanced
Correct answer is option 'B'. Can you explain this answer?

SSC Question

Learners World
Jun 06, 2021
In the case of reciprocating masses, Primary forces are partially balanced. Because in the reciprocating masses, "the resultant forces" will be completely balanced, but "the resultant couple" won't be balanced; that is why we call reciprocating masses only partially balanced.
Since reciprocating mass cannot balance fully, partial balancing of the reciprocating mass is done while revolving masses can be balanced fully.
Primary unbalanced Force FP = mrω2cos2θ
Secondary unbalanced Force = FS = mrω2cos2θ/n
Effect of Partial Balancing of Reciprocating Parts
Reciprocating parts are only partially balanced. Due to this partial balancing of the reciprocating parts, there is an unbalanced primary force along the line of stroke and an unbalanced primary force perpendicular to the stroke line. The effect of an unbalanced primary force along the line of stroke is to produce;
  • Variation in tractive force along the line of stroke
  • Swaying couple

This discussion on In reciprocating engines primary forces _________.a)Are completely balancedb)Are partially balancedc)Are balanced by secondary forcesd)Cannot be balancedCorrect answer is option 'B'. Can you explain this answer? is done on EduRev Study Group by SSC Students. The Questions and Answers of In reciprocating engines primary forces _________.a)Are completely balancedb)Are partially balancedc)Are balanced by secondary forcesd)Cannot be balancedCorrect answer is option 'B'. Can you explain this answer? are solved by group of students and teacher of SSC, which is also the largest student community of SSC. If the answer is not available please wait for a while and a community member will probably answer this soon. You can study other questions, MCQs, videos and tests for SSC on EduRev and even discuss your questions like In reciprocating engines primary forces _________.a)Are completely balancedb)Are partially balancedc)Are balanced by secondary forcesd)Cannot be balancedCorrect answer is option 'B'. Can you explain this answer? over here on EduRev! Apart from being the largest SSC community, EduRev has the largest solved Question bank for SSC.
This discussion on In reciprocating engines primary forces _________.a)Are completely balancedb)Are partially balancedc)Are balanced by secondary forcesd)Cannot be balancedCorrect answer is option 'B'. Can you explain this answer? is done on EduRev Study Group by SSC Students. The Questions and Answers of In reciprocating engines primary forces _________.a)Are completely balancedb)Are partially balancedc)Are balanced by secondary forcesd)Cannot be balancedCorrect answer is option 'B'. Can you explain this answer? are solved by group of students and teacher of SSC, which is also the largest student community of SSC. If the answer is not available please wait for a while and a community member will probably answer this soon. You can study other questions, MCQs, videos and tests for SSC on EduRev and even discuss your questions like In reciprocating engines primary forces _________.a)Are completely balancedb)Are partially balancedc)Are balanced by secondary forcesd)Cannot be balancedCorrect answer is option 'B'. Can you explain this answer? over here on EduRev! Apart from being the largest SSC community, EduRev has the largest solved Question bank for SSC.