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Machine Kinematics Multiple Choice Questions and Answers – Centre of Percussion
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Free download in PDF Machine Kinematics – Centre of Percussion Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) The piston of a steam engine moves with simple harmonic motion. The crank rotates at 120 r.p.m. with a stroke of 2 metres. Find the velocity of the piston, when it is at a distance of 0.75 metre from the centre.
[A] 8 m/s
[B] 8.31 m/s
[C] 9 m/s
[D] none of the mentioned
Answer: 8.31 m/s
(2) The piston of a steam engine moves with simple harmonic motion. The crank rotates at 120 r.p.m. with a stroke of 2 metres. Find the acceleration of the piston, when it is at a distance of 0.75 metre from the centre.
[A] 118.46 m/s2
[B] 90 m/s2
[C] 100 m/s2
[B] none of the mentioned
Answer: 118.46 m/s2

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(3) Law of isochronism
[A] states the time period (tp ) of a simple pendulum does not depend upon the mass of the body suspended at the free end of the string.
[B] states the time period (tp ) of a simple pendulum does not depend upon its amplitude of vibration and remains the same, provided the angular amplitude (θ) does not exceed 4°.
[C] states the time period (tp) of a simple pendulum is directly proportional to √L , where L is the length of the string.
[D] none of the mentioned
Answer: states the time period (tp ) of a simple pendulum does not depend upon its amplitude of vibration and remains the same, provided the angular amplitude (θ) does not exceed 4°.
(4) Law of mass
[A] states the time period (tp ) of a simple pendulum does not depend upon the mass of the body suspended at the free end of the string.
[B] states the time period (tp ) of a simple pendulum does not depend upon its amplitude of vibration and remains the same, provided the angular amplitude (θ) does not exceed 4°.
[C] states the time period (tp ) of a simple pendulum is directly proportional to √L , where L is the length of the string.
[D] none of the mentioned
Answer: states the time period (tp ) of a simple pendulum does not depend upon the mass of the body suspended at the free end of the string.
(5) Law of length
[A] states the time period (tp ) of a simple pendulum does not depend upon the mass of the body suspended at the free end of the string.
[B] states the time period (tp ) of a simple pendulum does not depend upon its amplitude of vibration and remains the same, provided the angular amplitude (θ) does not exceed 4°.
[C] states the time period (tp) of a simple pendulum is directly proportional to √L , where L is the length of the string.
[D] none of the mentioned
Answer: states the time period (tp) of a simple pendulum is directly proportional to √L , where L is the length of the string.
(6) Law of gravity
[A] states the time period (tp ) of a simple pendulum does not depend upon the mass of the body suspended at the free end of the string.
[B] states the time period (tp ) of a simple pendulum does not depend upon its amplitude of vibration and remains the same, provided the angular amplitude (θ) does not exceed 4°.
[C] states the time period (tp) of a simple pendulum is directly proportional to √L , where L is the length of the string.
[D] states the time period (tp ) of a simple pendulum is inversely proportional to √g , where g is the acceleration due to gravity.
Answer: states the time period (tp ) of a simple pendulum is inversely proportional to √g , where g is the acceleration due to gravity.
(7) A helical spring, of negligible mass, and which is found to extend 0.25 mm under a mass of 1.5 kg, is made to support a mass of 60 kg. The spring and the mass system is displaced vertically through 12.5 mm and released. Determine the frequency of natural vibration of the system.
[A] 6 Hz
[B] 4.98 Hz
[C] 5.98 Hz
[D] none of the mentioned
Answer: 4.98 Hz
(8) A helical spring, of negligible mass, and which is found to extend 0.25 mm under a mass of 1.5 kg, is made to support a mass of 60 kg. The spring and the mass system is displaced vertically through 12.5 mm and released. Find the velocity of the mass, when it is 5 mm below its rest position.
[A] 0.36 m/s
[B] 0.46 m/s
[B] 0.56 m/s
[B] none of the mentioned
Answer: 0.36 m/s

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