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Mechanical Engineering Objective Questions { Engineering Mechanics }



358.  Which of the following statement is correct?
A. The periodic time of a particle moving with simple harmonic motion is the time taken by a particle for one complete oscillation,
B. The periodic time of a particle moving with simple harmonic motion is directly proportional to its angular velocity.
C. The velocity of the particle moving with simple harmonic motion is zero at the mean position.
D. The acceleration of the particle moving with simple harmonic motion is maximum at the mean position.
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359. The law of the machine is(where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)
A. P = mW - C
B. P = m/W + C
C. P = mW + C
D. P = C - mW
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360. According to lami's theorem
A. the three forces must be equal
B. the three forces must be at 120° to each other
C. the three forces must be in equilibrium
D. if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two
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361. The centre of gravity of a quadrant of a circle lies along its central radius (r) at a distance of
A. 0.5r
B. 0.6r
C. 0.7r
D. 0.8r
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362. Which of the following are vector quantities?
A. Angular displacement
B. Angular velocity
C. Angular acceleration
D. all of these
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363. The maximum mechanical advantage of a lifting machine is
A. 1 + m
B. 1 - m
C. 1 / m
D. m
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364. A machine having an efficiency greater than 50%, is known as
A. reversible machine
B. non-reversible machine
C. neither reversible nor non-reversible machine
D. ideal machine
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