If n = number of members andy = number of joints, then for a perfect frame, n =_________________?

Related Mcqs:

1. A framed structure is perfect if it contains members equal to_________________?

   A. 2n-3
   B. n-l
   C. ‘2n-l
   D. n – 2
   E. 3n-2.
   where n = number of joints in a frame

2. In detennining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than____________________?

   A. two members with unknown forces of the frame
   B. three members with unknown forces of the frame
   C. four members with unknown forces of the frame
   D. three members with known forces of the frame
   E. four members with two known forces

3. The possible loading in various members of framed structures are_________________?

   A. compression or tension
   B. buckling or shear
   C. shear or tension
   D. all of the above
   E. bending

4. 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 ).

5. Coulomb friction is the friction between _________________?

   A. bodies having relative motion
   B. two dry surfaces
   C. two lubricated surfaces
   D. solids and liquids
   E. electrically charged particles

6. Limiting force of friction is the__________________?

   A. tangent of angle between normal-reaction and the resultant of normal reaction and limiting friction
   B. ratio of limiting friction and normal reaction
   C. the friction force acting when the body is just about to move
   D. the friction force acting when the body is in motion
   E. minimum force of friction

7. In actual machines_______________?

   A. mechanical advantage is greater than velocity ratio
   B. mechanical advantage is equal to velocity ratio
   C. mechanical advantage is less than velocity ratio
   D. mechanical advantage is unity
   E. none of the above

8. The co-efficient of friction depends upon_______________?

   A. nature of surfaces
   B. area of contact
   C. shape of the surfaces
   D. ail of the above.
   E. A. and B. above

9. 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

10. The units of moment of inertia of an area are__________________?

    A. kg m2
    B. m4
    C. kg/m2
    D. m3
    E. kg/m4