Discussion
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- Question
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°
- Correct Answer
- 0° and 180°
- 1. 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
- 2. 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 Discuss
- 3. 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
- 4. The frictional torque transmitted in a multi-collared shaft is same as that of a single collared shaft.
Options- A. Right
- B. Wrong Discuss
- 5. The centre distance between two meshing involute gears is equal to
Options- A.
- B.
- C.
- D.
Discuss
- 6. 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
- 7. 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
- 8. A pair of friction discs is an example of rolling pair.
Options- A. True
- B. False Discuss
- 9. The sliding pairs, turning pairs and screw pairs form lower pairs.
Options- A. True
- B. False Discuss
- 10. The two elements of a pair are said to form a __________ when they permit relative motion between them.
Options- A. open pair
- B. kinematic pair Discuss
Theory of machines problems
Search Results
Correct Answer: m1r1 = m2r2
Correct Answer: 52.92 N-s/m
Correct Answer: decreases exponentially with time
Correct Answer: Right
Correct Answer:
Correct Answer: 2.22 mm
Correct Answer: pitch curve
Correct Answer: False
Correct Answer: True
Correct Answer: kinematic pair
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