Discussion
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- Question
A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is
Options- A. 1.4 N-s/m
- B. 18.52 N-s/m
- C. 52.92 N-s/m
- D. 529.2 N-s/m
- Correct Answer
- 52.92 N-s/m
- 1. In under damped vibrating system, the amplitude of vibration
Options- A. decreases linearly with time
- B. increases linearly with time
- C. decreases exponentially with time
- D. increases exponentially with time Discuss
- 2. The frictional torque transmitted in a multi-collared shaft is same as that of a single collared shaft.
Options- A. Right
- B. Wrong Discuss
- 3. The centre distance between two meshing involute gears is equal to
Options- A.
- B.
- C.
- D.
Discuss
- 4. When a particle moves round the circumference of a circle of radius r with ? rad/s, then its maximum acceleration is ?2r.
Options- A. Right
- B. Wrong Discuss
- 5. In order to give the primary balance of the reciprocating parts of a multi-cylinder in-line engines,
Options- A. the algebraic sum of the primary forces must be equal to zero
- B. the algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
- C. both (a) and (b)
- D. none of these Discuss
- 6. A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m2 attached in the same plane of rotation as that of m1, such that (where r1 and r2 are the radii of rotation of m1 and m2 respectively)
Options- A. m1r2 = m2r1
- B. m1r1 = m2r2
- C. m1m2 = r1r2
- D. none of these Discuss
- 7. The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is
Options- A. 0° and 90°
- B. 0° and 180°
- C. 90° and 180°
- D. 180° and 360° Discuss
- 8. A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of
Options- A. 2 mm
- B. 2.22 mm
- C. 2.50 mm
- D. 3.0 mm Discuss
- 9. The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the
Options- A. pitch circle
- B. base circle
- C. pitch curve
- D. prime circle Discuss
- 10. A pair of friction discs is an example of rolling pair.
Options- A. True
- B. False Discuss
Theory of machines problems
Search Results
Correct Answer: decreases exponentially with time
Correct Answer: Right
Correct Answer:
Correct Answer: Right
Correct Answer: both (a) and (b)
Correct Answer: m1r1 = m2r2
Correct Answer: 0° and 180°
Correct Answer: 2.22 mm
Correct Answer: pitch curve
Correct Answer: False
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