Theory of Machine
Balancing of rotating and reciprocating parts of an engine is necessary when it runs at

Any one of these
Moderate speed
Highs peed
Slow speed

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Theory of Machine
For dynamic balancing of a shaft

Both (A) and (B)
None of these
The net dynamic force acting on the shaft is equal to zero
The net couple due to the dynamic forces acting on the shaft is equal to zero

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Theory of Machine
Lower pairs are those which have

Elements of pairs not held together mechanically
Point or line contact between the two elements when in motion
Two elements that permit relative motion
Surface contact between the two elements when in motion

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