Engineering Questions with Answers - Multiple Choice Questions
Machine Dynamics MCQ – Effect of Partial Balancing of Reciprocating Parts of Two Cylinder Locomotives
1 - Question
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
View Answer
Answer: a
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 - Question
Due to partial balancing there is unbalanced force only along the line of stroke.
a) True
b) False
View Answer
Answer: b
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 - Question
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
View Answer
Answer: a
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 - Question
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
View Answer
Answer: a
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 - Question
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
View Answer
Answer: a
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.
6 - Question
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
View Answer
Answer: a
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 - Question
Hammer blow is along the line of stroke of the unbalanced force.
a) True
b) False
View Answer
Answer: b
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.