Discussion
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- Question
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
- Correct Answer
- both (a) and (b)
- 1. 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
- 2. 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
- 3. 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
- 4. The ratio of the actual damping coefficient to the critical damping coefficient is called damping factor.
Options- A. Yes
- B. No Discuss
- 5. 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
- 6. 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
- 7. The centre distance between two meshing involute gears is equal to
Options- A.
- B.
- C.
- D.
Discuss
- 8. The frictional torque transmitted in a multi-collared shaft is same as that of a single collared shaft.
Options- A. Right
- B. Wrong Discuss
- 9. In under damped vibrating system, the amplitude of vibration
Options- A. decreases linearly with time
- B. increases linearly with time
- C. decreases exponentially with time
- D. increases exponentially with time Discuss
- 10. 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
Theory of machines problems
Search Results
Correct Answer: double row spherical roller bearing
Correct Answer: (1 - c)m.?2.r(cos ? - sin ?)
Correct Answer: 180°
Correct Answer: Yes
Correct Answer: No
Correct Answer: Right
Correct Answer:
Correct Answer: Right
Correct Answer: decreases exponentially with time
Correct Answer: 52.92 N-s/m
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