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- Question
The frequency of damped vibrations with viscous damping is __________ the frequency of undamped vibrations.
Options- A. more than
- B. less than
- C. same as
- Correct Answer
- less than
- 1. 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
- 2. 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
- 3. When the connection between the two elements is such that only required kind of relative motion occurs, it is known as self-closed pair.
Options- A. Right
- B. Wrong Discuss
- 4. In a screw jack, the effort required to lower the load W is given by
Options- A. P = W tan(? - ?)
- B. P = W tan(? + ?)
- C. P = W tan(? - ?)
- D. P = W cos(? + ?) Discuss
- 5. The pair is known as a higher pair, when the relative motion between the elements of a pair is
Options- A. turning only
- B. sliding only
- C. rolling only
- D. partly turning and partly sliding Discuss
- 6. 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
- 7. An automobile steering gear is an example of
Options- A. sliding pair
- B. rolling pair
- C. lower pair
- D. higher pair Discuss
- 8. 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 Discuss
- 9. Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.
Options- A. Right
- B. Wrong Discuss
- 10. 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
Theory of machines problems
Search Results
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: P = W tan(? - ?)
Correct Answer: partly turning and partly sliding
Correct Answer: both (a) and (b)
Correct Answer: lower pair
Correct Answer: is in motion
Correct Answer: Right
Correct Answer: lower pair
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