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Machine Dynamics Practice Test: Balancing of Reciprocating Masses
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Balancing of Reciprocating Masses topics include: Primary unbalanced forces for reciprocating masses, locomatives balancing, tractive force, swaying couple, multi cylinder inline and v-engines. Balancing of reciprocating masses is a mechanical engineering process that involves distributing the weight of all components in a machine evenly.  The purpose of balancing is to: Reduce vibrations Ensure smooth operation of rotating machinery Minimize dynamic forces and moments Prevent excessive wear, noise, and structural failure  An imbalance in these masses can lead to machine failure,... Show more
Machine Dynamics Practice Test: Balancing of Reciprocating Masses
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25 Questions

1. If the mass of the reciprocating parts is doubled, then the primary force is halved.
2. For a V-twin engine, which of the following means can be used to balance the primary forces?
3. This couple has swaying effect about a horizontal axis.
4. In an outside cylinder locomotive, the position of the driving wheels is _________
5. At which of the following angles in degrees does the tractive force attains a maximum value?
6. Find the maximum value of tractive force in newtons from the following data:
m = 100Kg
ω = 300 rpm
radius = 0.6m
c = 2/3
7. Hammer blow is along the line of stroke of the unbalanced force.
8. The partial balancing means
9. What is the effect of variation of pressure on the rails?
10. The tractive force is maximum or minimum when the angle of inclination of the crank to the line of stroke ( θ ) is equal to
11. What is the total no. of cylinders in a locomotive having crank at right angles?
12. A single or uncoupled locomotive is one, in which the effort is transmitted to _____
13. Find the minimum value of swaying couple in newtons from the following data:
m = 100Kg
ω = 300 rpm
radius = 0.6m
c = 2/3
a = 2\(\sqrt{2}\)m
14. At which of the following angles in degrees does the swaying couple attains a maximum value?
15. For a two cylinder locomotives, the crank are placed at right angles to each other.
16. In coupled locomotives, the driving wheels are connected to the leading and trailing wheel by an _______ coupling rod.
17. Find the minimum value of tractive force in newtons from the following data:
m = 100Kg
ω = 300 rpm
radius = 0.6m
c = 2/3
18. In order to facilitate the starting of locomotive in any position, the cranks of a locomotive, with two cylinders, are placed at ______________ to each other.
19. In a locomotive, the maximum magnitude of the unbalanced force along the perpendicular to the line of stroke, is known as
20. A V-twin engine has the cylinder axes at 90 degrees and the connecting rods operate a common crank. The reciprocating mass per cylinder is 23 kg and the crank radius is 7.5 cm. The length of the connecting rod is 0.3 m. If the engine is rotating at the speed is 500 r.p.m. What is the value of maximum resultant secondary force in Newtons?
21. The effect of an unbalanced primary force along the line of stroke is to produce ________
22. Due to partial balancing there is unbalanced force only along the line of stroke.
23. The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke ( θ ) is equal to
24. Find the variation in swaying couple in newtons from the following data:
m = 100Kg
ω = 300 rpm
radius = 0.6m
c = 2/3
a = 2\(\sqrt{2}\)m
25. From the following data of a 60 degree V-twin engine, determine the maximum value for primary forces in newtons:
Reciprocating mass per cylinder = 1.5 Kg
Stroke length = 10 cm
Length of connecting rod = 25 cm
Engine speed = 2500 rpm