Two coplanar couples having equal and op-posite moments_________________?

Related Mcqs:

1. According to principle of moments_________________?

   A. if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
   B. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
   C. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
   D. positive and negative couples can be balanced
   E. none of the above

2. The resultant of the following three couples 20 kg force, 0.5 m arm, $ ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be_________________?

   A. 20 kg, – ve sense
   B. 20 kg, + ve sense
   C. 10 kg, + ve sense
   D. 10 kg, – ve sense
   E. 45 kg, + ve sense

3. Forces are called coplanar when all of them acting on body lie in________________?

   A. one point
   B. one plane
   C. different planes
   D. perpendicular planes
   E. different points

4. A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of__________________?

   A. r/2
   B. r/A
   C. r/%
   D. 0.134 r
   E. 3r/8

5. If two equal forces of magnitude P act at an angle 9°, their resultant will be________________?

   A. P/2 cos 9/2
   B. IP sin 9/2
   C. 2P tan 9/2
   D. IP cos 9/2
   E. Psin 9/2

6. The resolved part of the resultant of two forces inclined at an angle 9 in a given direction is equal to__________________?

   A. the algebraic sum of the resolved parts of the forces in the given direction
   B. the sum of the resolved parts of the forces in the given direction
   C. the difference of the forces multiplied by the cosine of 9
   D. the sum of the forces multiplied by the sine of 9
   E. the sum of the forces multiplied by the tangent of 9

7. A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to___________________?

   A. W
   B. W sin (a + $)
   C. Wtan(a + <|))
   D. Wan(a-)
   E. Wtana

8. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one________________?

   A. ellipse
   B. hyperbola
   C. parabola
   D. circle
   E. none of the above

9. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to______________?

   A. 25
   B. 50
   C. 100
   D. 250
   E. 500

10. The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to_________________?

    A. Wtan(a + )
    B. Wtan(a-)
    C. Wcos(a + )
    D. Wsin(a + )
    E. W (sin a + cos )