491. The acceleration of the particle moving with simple harmonic motion is inversely proportional to the displacement of the particle from the mean position.
Yes
No
✅ The correct answer is option B.
Theory of machines MCQs
492. A pair of friction discs is an example of rolling pair.
TRUE
FALSE
✅ The correct answer is option B.
494. The factor which affects the critical speed of a shaft is
diameter of disc
span of shaft
eccentricity
all of these
✅ The correct answer is option D.
495. In order to balance the reciprocating masses,
primary forces and couples must be balanced
secondary forces and couples must be balanced
both (a) and (b)
none of these
✅ The correct answer is option C.
496. The static friction
[A]. bears a constant ratio to the normal reaction between the two surfaces
[B]. is independent of the area of contact, between the two surfaces
[C]. always acts in a direction, opposite to that in which the body tends to move
[D]. all of the above
✅ The correct answer is option D.
497. The gears are termed as medium velocity gears, if their peripheral velocity is
[A]. 1 – 3 m/s
[B]. 3 – 15 m/s
[C]. 15 – 30 m/s
[D]. 30 – 50 m/s
✅ The correct answer is option B.
498. The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is
[A]. 0° and 90°
[B]. 0° and 180°
[C]. 90° and 180°
[D]. 180° and 360°
✅ The correct answer is option B.
499. In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is
[A]. equal to one
[B]. equal to 2
[C]. less than 2
[D]. greater than 2
✅ The correct answer is option B.
500. The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to
[A]. 90° and 180°
[B]. 45° and 225°
[C]. 180° and 270°
[D]. 270° and 360°
✅ The correct answer is option B.