logo

CuriousTab

CuriousTab

Discussion

Home ‣ Mechanical Engineering ‣ Engineering Mechanics Comments
  • Question

  • The efficiency of a screw jack is maximum, when(where ? = Helix angle, and ? = Angle of friction.)


  • Options
  • A. ? = 45° + ?/2
  • B. ? = 45° - ?/2
  • C. ? = 90° + ?
  • D. ? = 90° - ?

  • Correct Answer
  • ? = 45° - ?/2 

    • Engineering Mechanics problems

    Search Results

    • 1. A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

    • Options
    • A. 1m
    • B. 2m
    • C. 3m
    • D. 4m
      • Discuss
    • 2. For a self locking machine, the efficiency must be

    • Options
    • A. equal to 50%
    • B. less than 50%
    • C. greater than 50%
    • D. 100%
      • Discuss
    • 3. The terms 'leverage' and 'mechanical advantage' Of a compound lever have got the same meaning.

    • Options
    • A. Correct
    • B. Incorrect
      • Discuss
    • 4. The centre of oscillation and centre of suspension for a compound pendulum are interchangeable.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. The periodic time (T) is given by(where ? = Angular velocity of particle in rad / s.)

    • Options
    • A. ?/2?
    • B. 2?/?
    • C. 2? x ?
    • D. ?/?
      • Discuss
    • 6. 
      The above figure shows the three coplaner forces P, Q and R acting at a point O. If these forces are in equilibrium, then

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. The range of projectile(R) on an upward inclined plane is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 8. In a wormed geared pulley block, if the number of teeth on the worm wheel is doubled, then its velocity ratio is also doubled.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. In a framed structure, as shown in the below figure, the force in the member CD is tensile in nature.

    • Options
    • A. Agree
    • B. Disagree
      • Discuss
    • 10. The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudinal axis or polar axis is

    • Options
    • A. mr2/2
    • B. mr2/4
    • C. mr2/6
    • D. mr2/8
      • Discuss

    Comments

    There are no comments.
Enter a new Comment




Aptitude

Engineering

Programming

Reasoning

Links

Copyright ©CuriousTab. All rights reserved.