# Machine Dynamics Questions and Answers – Effect of Partial Balancing of Reciprocating Parts of Two Cylinder Locomotives

This set of Machine Dynamics Puzzles focuses on “Effect of Partial Balancing of Reciprocating Parts of Two Cylinder Locomotives”.

1. What is the effect of partial balancing of the reciprocating parts?
a) Unbalanced primary force
b) Unbalanced secondary force
c) Balanced primary force
d) Balanced secondary force

Explanation: The 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.

2. Due to partial balancing there is unbalanced force only along the line of stroke.
a) True
b) False

Explanation: Partial balancing results in generation of unbalanced force acting along the line of stroke and in a direction perpendicular to the line of stroke.

3. The effect of an unbalanced primary force along the line of stroke is to produce ________
a) Swaying couple
b) Constant tractive force
c) Piston effort
d) Crank effort

Explanation: The major effect of an unbalanced primary force along the line of stroke is to produce Swaying couple and change in Tractive force along the line of stroke.

4. The effect of an unbalanced primary force perpendicular to the line of stroke is to produce _____
a) Variation in pressure on the rails
b) Variation in tractive force
c) Swaying couple
d) Piston effort

Explanation: The effect of an unbalanced primary force along the line of stroke is to produce Swaying couple and variation in tractive force along the line of stroke and The effect of an unbalanced primary force perpendicular to the line of stroke is to produce variation in pressure on the rails.

5. What is the effect of variation of pressure on the rails?
a) Hammering action
b) Piston effort
c) Variation in tractive force
d) Swaying couple

Explanation: The effect of an unbalanced primary force perpendicular to the line of stroke is to produce variation in pressure on the rails, which results in hammering action on the rails.
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6. Hammering action on the rails is caused by _______
a) Variation of pressure on the rails
b) Variation of temperature on the rails
c) Variation of thermal diffusibility of the rails
d) Variation of crank effort

Explanation: The maximum magnitude of the unbalanced force along the perpendicular to the line of stroke of rails is the hammering action caused by the variation in pressure on the rails due to unbalanced forces.

7. Hammer blow is along the line of stroke of the unbalanced force.
a) True
b) False

Explanation: Hammer blow is defined as the maximum magnitude of the unbalanced force along the perpendicular to the line of action of the stroke, it’s effect can be seen as the hammering effect on the rails.

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