Theory of machines problems
- 1. 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
Correct Answer: lower pair
- 2. 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
Correct Answer: 45° and 225°
- 3. 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
Correct Answer: No
- 4. The ratio of the actual damping coefficient to the critical damping coefficient is called damping factor.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 5. 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
Correct Answer: 180°
- 6. 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
Correct Answer: (1 - c)m.?2.r(cos ? - sin ?)
- 7. In railway axle boxes, the bearing used is
Options- A. deep groove ball bearing
- B. double row self-aligning ball bearing
- C. double row spherical roller bearing
- D. cylindrical roller bearing Discuss
Correct Answer: double row spherical roller bearing
- 8. In order to give the primary balance of the reciprocating parts of a multi-cylinder in-line engines,
Options- A. the algebraic sum of the primary forces must be equal to zero
- B. the algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
- C. both (a) and (b)
- D. none of these Discuss
Correct Answer: both (a) and (b)
- 9. When a particle moves round the circumference of a circle of radius r with ? rad/s, then its maximum acceleration is ?2r.
Options- A. Right
- B. Wrong Discuss
Correct Answer: Right
- 10. The centre distance between two meshing involute gears is equal to
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
More in Mechanical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.