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Exam 4: Mechanical Balancing of Rotating Systems: Calculations and Principles

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Question 1

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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

A) 7711
B) 4546
C) 2570
D) 8764

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Question 2

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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?

A) 736
B) 836
C) 936
D) 636

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Question 3

Multiple Choice

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From the given data, find the balancing mass's inclination in degrees if r=0.2m required in the same plane.Masses = 200kg, 300kg, 240 kg, 260Kg,

From the following data of a 60 degree V-twin engine, determine the minimum 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

Let the disturbing mass be 200 kg and the radius of rotation be 20 cm and the rotation speed be 50 rad/s, then calculate the centripetal force in kN.

Let the disturbing mass be 100 kg and the radius of rotation be 10 cm and the rotation speed be 50 rad/s, then calculate the centrifugal force in kN.

In a locomotive, the ratio of the connecting rod length to the crank radius is kept very large in order to

Which of the following is the correct expression for secondary force?

For a V-twin engine, which of the following means can be used to balance the primary forces?

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 34.5 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 kN?

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?

Which of the following statement is correct?

If all the masses are in one plane, then what is the maximum no. of masses which can be placed in the same plane?

For the secondary balancing of the engine, which of the condition is necessary?

In order to achieve stability, the sum of secondary forces and secondary couples must be ------- and their respective polygons must be …......

Which of the following statements is correct about the balancing of a mechanical system?

The numerical values of the secondary forces and secondary couples couples may be obtained by considering the ___________

From the given data, find the balancing mass in Kg if r=0.2m required in the same plane.Masses = 200kg, 300kg, 240 kg, 260Kg, corresponding radii = 0.2m, 0.15m, 0.25m and 0.3m.Angles between consecutive masses = 45, 75 and 135 degrees.

In balancing of single-cylinder engine, the rotating unbalance is ____________

Which of the following statements are associated with complete dynamic balancing of rotating systems? 1) Resultant couple due to all inertia forces is zero. 2) Support reactions due to forces are zero but not due to couples . 3) The system is automatically statically balanced. 4) Centre of masses of the system lies on the axis of rotation.