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MCQs

Total Questions : 543 | Page 54 of 55 pages
Question 531. When the particles of a body moves perpendicular to its axis, then the body is said to have
  1.    Longitudinal vibration
  2.    Transverse vibration
  3.    Torsional vibration
  4.    None of these
 Discuss Question
Answer: Option B. -> Transverse vibration
Question 532. When there is a reduction in amplitude over every cycle of vibration, then the body is said to have
  1.    Free vibration
  2.    Forced vibration
  3.    Damped vibration
  4.    Under damped vibration
 Discuss Question
Answer: Option C. -> Damped vibration
Question 533. When a shaking force is transmitted through the springs, damping becomes detrimental when the ratio of its frequency to the natural frequency is greater than
  1.    0.25
  2.    0.5
  3.    1
  4.    2
 Discuss Question
Answer: Option D. -> 2
Question 534. A rotor supported at A and B carries two masses as shown in the below figure. The rotor is
  1.    Dynamically balanced
  2.    Statically balanced
  3.    Statically and dynamically balanced
  4.    Not balanced
 Discuss Question
Answer: Option C. -> Statically and dynamically balanced
Question 535. The equation of free vibrations of a system is $$\frac{{{{\text{d}}^2}{\text{x}}}}{{{\text{d}}{{\text{t}}^2}}} + 36{\pi ^2}{\text{x}} = 0{\text{,}}$$    its natural frequency is
  1.    3Hz
  2.    $$3\pi {\text{Hz}}$$
  3.    6Hz
  4.    $$6\pi {\text{Hz}}$$
 Discuss Question
Answer: Option A. -> 3Hz
Question 536. The amplitude of vibration is always __________ the radius of the circle.
  1.    Equal to
  2.    Less than
  3.    Greater than
  4.    None of these
 Discuss Question
Answer: Option A. -> Equal to
Question 537. According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on
  1.    A triangle
  2.    A point
  3.    Two lines
  4.    A straight line
 Discuss Question
Answer: Option D. -> A straight line
Question 538. The Bifilar suspension method is used to determine
  1.    Natural frequency of vibration
  2.    Position of balancing weights
  3.    Moment of inertia
  4.    Centripetal acceleration
 Discuss Question
Answer: Option C. -> Moment of inertia
Question 539. The displacement of the reciprocating roller follower, when it has contact with the straight flanks of the tangent cam, is given by (where r1 = Minimum radius of the cam, r2 = Radius of the roller follower and $$\theta $$ = Angle turned by the cam from the beginning of the follower displacement)
  1.    $$\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)\left( {1 - \cos \theta } \right)$$
  2.    $$\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\left( {1 + \cos \theta } \right)$$
  3.    $$\left( {{{\text{r}}_1} - {{\text{r}}_2}} \right)\left( {\frac{{1 - \cos \theta }}{{\cos \theta }}} \right)$$
  4.    $$\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\left( {\frac{{1 - \cos \theta }}{{\cos \theta }}} \right)$$
 Discuss Question
Answer: Option D. -> $$\left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\left( {\frac{{1 - \cos \theta }}{{\cos \theta }}} \right)$$
Question 540. At the nodal point in a shaft, the amplitude for torsional vibration will be
  1.    Minimum
  2.    Maximum
  3.    Zero
  4.    Infinity
 Discuss Question
Answer: Option C. -> Zero

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