logo

CuriousTab

CuriousTab

Discussion

Home ‣ Mechanical Engineering ‣ Theory of machines Comments
  • Question

  • 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

  • Correct Answer
  • Right 

    • Theory of machines problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. 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
    • 4. 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
    • 5. The ratio of the actual damping coefficient to the critical damping coefficient is called damping factor.

    • Options
    • A. Yes
    • B. No
      • Discuss
    • 6. The centre distance between two meshing involute gears is equal to

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. The frictional torque transmitted in a multi-collared shaft is same as that of a single collared shaft.

    • Options
    • A. Right
    • B. Wrong
      • Discuss
    • 8. 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
    • 9. 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
    • 10. A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m2 attached in the same plane of rotation as that of m1, such that (where r1 and r2 are the radii of rotation of m1 and m2 respectively)

    • Options
    • A. m1r2 = m2r1
    • B. m1r1 = m2r2
    • C. m1m2 = r1r2
    • D. none of these
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.