Discussion
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- Question
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
- Correct Answer
- lower pair
- 1. Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.
Options- A. Right
- B. Wrong Discuss
- 2. 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
- 3. An automobile steering gear is an example of
Options- A. sliding pair
- B. rolling pair
- C. lower pair
- D. higher pair Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. The ratio of the actual damping coefficient to the critical damping coefficient is called damping factor.
Options- A. Yes
- B. No Discuss
- 9. If ?/?n is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
Options- A. 0°
- B. 90°
- C. 180°
- D. 360° Discuss
- 10. The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ? = Angular speed of crank, r = Radius of crank, and ? = Angle of inclination of crank to the line of stroke)
Options- A. m.?2.r cos ?
- B. c.m.?2.r sin ?
- C. (1 - c)m.?2.r(cos ? - sin ?)
- D. m.?2.r(cos ? - sin ?) Discuss
Theory of machines problems
Search Results
Correct Answer: Right
Correct Answer: is in motion
Correct Answer: lower pair
Correct Answer: both (a) and (b)
Correct Answer: less than
Correct Answer: 45° and 225°
Correct Answer: No
Correct Answer: Yes
Correct Answer: 180°
Correct Answer: (1 - c)m.?2.r(cos ? - sin ?)
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