Discussion
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- Question
A pair of friction discs is an example of rolling pair.
Options- A. True
- B. False
- Correct Answer
- False
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. The sliding pairs, turning pairs and screw pairs form lower pairs.
Options- A. True
- B. False Discuss
- 7. 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
- 8. The electrodes used in spot welding have a tip of
Options- A. stainless steel
- B. aluminium
- C. copper
- D. brass Discuss
- 9. The blank diameter used in thread rolling will be
Options- A. equal to minor diameter of the thread
- B. equal to pitch diameter of the thread
- C. a little larger than the minor diameter of the thread
- D. a little larger than the pitch diameter of the thread Discuss
- 10. Metal patterns are used for
Options- A. small castings
- B. large castings
- C. complicated castings
- D. large scale production of castings Discuss
Theory of machines problems
Search Results
Correct Answer: pitch curve
Correct Answer: 2.22 mm
Correct Answer: 0° and 180°
Correct Answer: m1r1 = m2r2
Correct Answer: 52.92 N-s/m
Correct Answer: True
Correct Answer: kinematic pair
Correct Answer: copper
Correct Answer: a little larger than the minor diameter of the thread
Correct Answer: large scale production of castings
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