Applied Mechanics and Graphic Statics

221. The centre of gravity of a homogenous body is the point at which the whole

  1. Volume of the body is assumed to be concentrated
  2. Area of the surface of the body is assumed to be concentrated
  3. Weight of the body is assumed to be concentrated
  4. All the above

Correct answer: (C)
Weight of the body is assumed to be concentrated

222. The centre of gravity of a plane lamina will not be at its geometrical centre if it is a

  1. Circle
  2. Equilateral triangle
  3. Rectangle
  4. Right angled triangle

Correct answer: (D)
Right angled triangle

223. The centre of gravity of a quadrant of a circle lies along its central radius at a distance of

  1. 0.2 R
  2. 0.4 R
  3. 0.3 R
  4. 0.6 R

Correct answer: (D)
0.6 R

224. The centre of gravity of a trapezoidal dam section whose top width is a, bottom width is band the vertical side is a, from its vertical face is

  1. (a2 + ab + b2)/3 (a + b)
  2. (b2 + bc + c2)/3 (b + c)
  3. (a2 + ab + c2)/3 (a + c)
  4. None of these

Correct answer: (A)
(a2 + ab + b2)/3 (a + b)

225. The centre of gravity of a triangle is at the point where three

  1. Medians of the triangle meet
  2. Perpendicular bisectors of the sides of the triangle meet
  3. Bisectors of the angle of the triangle meet
  4. None of these

Correct answer: (A)
Medians of the triangle meet

226. The characteristic of a couple is:

  1. Algebraic sum of forces, constituting a couple is zero
  2. Algebraic sum of moments of forces, constituting a couple, about any point, is same
  3. A couple can be never the balanced by a single force
  4. All the above

Correct answer: (D)
All the above

227. The condition for a lifting machine to be reversible is that its efficiency should be

  1. Less than 50%
  2. More than 50%
  3. More than 66.67%
  4. Equal to 100%

Correct answer: (B)
More than 50%

228. The condition of equilibrium for any system of forces in a plane is

  1. That polygon of forces must close
  2. That resultant couple must be zero
  3. Both (A) and (B)
  4. None of the above

Correct answer: (C)
Both (A) and (B)

229. The diagram showing the point of application and line of action of forces in their plane is called

  1. Vector diagram
  2. Space diagram
  3. Force diagram
  4. Funicular diagram

Correct answer: (B)
Space diagram

230. The direction of projection should bisect the angle between the inclined plane and the vertical for a range of a projectile on inclined plane

  1. To be zero
  2. To be maximum
  3. To be minimum
  4. None of these

Correct answer: (B)
To be maximum

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