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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. For a two cylinder locomotives, the crank are placed at right angles to each other.
2. Swaying couple attains a maxima or minima when the crank angle is 45 degrees.
3. The partial balancing means
4. The resultant unbalanced force due to the two cylinders, along the line of stroke, is known as ______
5. In coupled locomotives, the driving wheels are connected to the leading and trailing wheel by an _______ coupling rod.
6. 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
7. The swaying couple is due to the
8. The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is
9. The unbalanced forces along the line of stroke for the two cylinders constitute a ______ about the centre line between the cylinders.
10. Find the maximum value of swaying couple in newtons from the following data:
m = 200Kg
ω = 300 rpm
radius = 0.6m
c = 2/3
a = 2\(\sqrt{2}\)m
11. The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke ( θ ) is equal to
12. 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 11.5 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?
13. This couple has swaying effect about a horizontal axis.
14. What is the total no. of cylinders in a locomotive having crank at right angles?
15. Tractive force attains a maxima or minima when the crank angle is 90 degrees.
16. In an outside cylinder locomotive, the position of the driving wheels is _________
17. For a V-twin engine, which of the following means can be used to balance the primary forces?
18. Due to partial balancing there is unbalanced force only along the line of stroke.
19. If the maximum value occurs at 45 degrees then at which of the following angles in degrees will the swaying couple attains its maximum value again?
20. 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.
21. If c be the fraction of the reciprocating parts of mass m to be balanced per cyclinder of a steam locomotive with crank radius r, angular speed ω, distance between centre lines of two cylinders a, then the magnitude of the maximum swaying couple is given by
22. 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
23. Find the variation in tractive force in newtons from the following data:
m = 100Kg
ω = 300 rpm
radius = 0.6m
c = 2/3
24. In a locomotive, the ratio of the connecting rod length to the crank radius is kept very large in order to
25. The effect of an unbalanced primary force along the line of stroke is to produce ________

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