Discussion
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- Question
The dynamic friction is the friction experienced by a body, when the body
Options- A. is in motion
- B. is at rest
- C. just begins to slide over the surface of the other body
- D. none of the above
- Correct Answer
- is in motion
- 1. An automobile steering gear is an example of
Options- A. sliding pair
- B. rolling pair
- C. lower pair
- D. higher pair Discuss
- 2. In order to balance the reciprocating masses,
Options- A. primary forces and couples must be balanced
- B. secondary forces and couples must be balanced
- C. both (a) and (b)
- D. none of these Discuss
- 3. The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations.
Options- A. more than
- B. less than
- C. same as Discuss
- 4. The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ?1 rad/s in the clockwise direction and the link OB turns with angular velocity ?2 rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
Options- A. ?1.?2.r
- B. ( ?1 - ?2)r
- C. ( ?1 + ?2)r
- D. ( ?1 - ?2)2r Discuss
- 5. In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon
Options- A. total lift, total angle of lift, minimum radius of cam and cam speed
- B. radius of circular arc, cam speed, location of centre of circular arc and roller diameter
- C. mass of cam follower linkage, spring stiffness and cam speed
- D. total lift, centre of gravity of the cam and cam speed Discuss
- 6. Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.
Options- A. Right
- B. Wrong Discuss
- 7. When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a
Options- A. lower pair
- B. higher pair
- C. self-closed pair
- D. force-closed pair Discuss
- 8. The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (?) is equal to
Options- A. 90° and 180°
- B. 45° and 225°
- C. 180° and 270°
- D. 270° and 360° Discuss
- 9. The acceleration of the particle moving with simple harmonic motion is inversely proportional to the displacement of the particle from the mean position.
Options- A. Yes
- B. No Discuss
- 10. The ratio of the actual damping coefficient to the critical damping coefficient is called damping factor.
Options- A. Yes
- B. No Discuss
Theory of machines problems
Search Results
Correct Answer: lower pair
Correct Answer: both (a) and (b)
Correct Answer: less than
Correct Answer: ( ?1 - ?2)r
Correct Answer: total lift, total angle of lift, minimum radius of cam and cam speed
Correct Answer: Right
Correct Answer: lower pair
Correct Answer: 45° and 225°
Correct Answer: No
Correct Answer: Yes
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