Dynamics of Machinary MCQ Questions and answers

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

(A) minimize the effect of primary forces
(B) minimize the effect of secondary forces
(C) have perfect balancing
(D) start the locomotive conveniently

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Q. Secondary forces in reciprocating mass on engine frame are

(A) of same frequency as of primary forces
(B) twice the frequency as of primary forces
(C) four times the frequency as of primary forces
(D) none of the mentioned

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

(A) Revolving balance mass
(B) Rotating balance mass
(C) Reciprocating balance mass
(D) By the means of secondary forces

A

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Q. The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

(A) 0°
(B) 90°
(C) 180°
(D) 360°

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Q. 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

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

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Q. 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

A

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Q. In the given figure, m1=10 Kg, m2=30Kg and m=50 Kg, if r=0.3m, l=1m, find l2 = 0.5m, find r1 in m.

(A) 1.5
(B) 0.75
(C) 3
(D) 6

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Q. 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,

(A) 201.48
(B) 200.32
(C) 210.34
(D) 202.88

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Q. 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.

(A) 1, 2, 3 and 4
(B) 1, 2, and 3 only
(C) 2, 3 and 4 only
(D) 1, 3 and 4 only

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Q. 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

Dynamics of Machinary MCQs with answers Page - 4

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

Q. Secondary forces in reciprocating mass on engine frame are

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

Q. The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

Q. 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

Q. 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

Q. In the given figure, m1=10 Kg, m2=30Kg and m=50 Kg, if r=0.3m, l=1m, find l2 = 0.5m, find r1 in m.

Q. 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,

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