In a screw jack, the effort required to lower the load W is given by

A. P = W tan(α - φ)

B. P = W tan(α + φ)

C. P = W tan(φ - α)

D. P = W cos(α + φ)

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. A mechanism __________ for transmitting or transforming motion.
  2. A body is said to be under forced vibrations, when
  3. The main disadvantage of the sliding pair is that it is
  4. When the body is suspended at the point of suspension, its periodic time and frequency will be ________…
  5. Module of a gear is
  6. Rectangular bar in a rectangular hole is the following type of pair
  7. The tendency of a body to resist change from rest or motion is known as
  8. In gramophones for adjusting the speed of the turntable, the following type of governor is commonly…
  9. In a spring controlled governor, when the controlling force ________ as the radius of rotation increases,…
  10. An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called
  11. Which of the following disciplines provides study of inertia forces arising from the combined effect…
  12. Sensitiveness of the governor is defined as the ratio of the
  13. The frictional torque transmitted in a truncated conical pivot bearing, considering uniform pressure,…
  14. In involute gears, the pressure angle is
  15. For low and moderate speed engines, the cam follower should move with
  16. Flexible coupling is used because
  17. The angle of inclination of the plane, at which the body begins to move down the plane is called
  18. The Klein's diagram is useful to find
  19. In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing…
  20. The lower pairs are __________ pairs.
  21. When the belt is stationary, it is subjected to some tension known as initial tension. The value of…
  22. In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater…
  23. In a steam engine, the distance by which the outer edge of the Dslide valve overlaps the steam port…
  24. The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.
  25. For high speed engines, the cam follower should move with
  26. The relation between number of links (l) and number of joints (j) in a kinematic chain is
  27. An eccentric sheave pivoted at one point rotates and transmits oscillatory motion to a link whose one…
  28. A universal joint is an example of
  29. Angle of ascent of cam is defined as the angle
  30. When the load on the engine increases, it becomes necessary to increase the supply of working fluid…