Dynamics of Machinery MCQs | Page - 4

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Mr. Dubey • 52.61K Points
Coach

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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Mr. Dubey • 52.61K Points
Coach

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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Mr. Dubey • 52.61K Points
Coach

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
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Mr. Dubey • 52.61K Points
Coach

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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Mr. Dubey • 52.61K Points
Coach

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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M

Mr. Dubey • 52.61K Points
Coach

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
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M

Mr. Dubey • 52.61K Points
Coach

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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Mr. Dubey • 52.61K Points
Coach

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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Mr. Dubey • 52.61K Points
Coach

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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Mr. Dubey • 52.61K Points
Coach

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
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