Applied Mechanics and Graphic Statics

171. Kinetic friction may be defined as

1. Friction force acting when the body is just about to move
2. Friction force acting when the body is in motion
3. Angle between normal reaction and resultant of normal reaction and limiting friction
4. Ratio of limiting friction and normal reaction

View answer

172. Lami's theorem states that

1. Three forces acting at a point are always in equilibrium
2. If three forces acting on a point can be represented in magnitude and direction by the sides of a triangle, the point will be in the state of equilibrium
3. Three coplanar forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two
4. Three coplanar forces acting at a point will be in equilibrium if each force is inversely proportional to the sine of the angle between the other two

View answer

173. M.I. of a thin ring (external diameter D, internal diameter d) about an axis perpendicular to the plane of the ring, is

1. π/64(D⁴ + d⁴)
2. π/32(D⁴ - d⁴)
3. π/32(D⁴ + d⁴)
4. π/32(D⁴ × d⁴)

View answer

174. M.I. of solid sphere, is

1. ⅔Mr²
2. ½ Mr²
3. ½Mr²
4. πr⁴/2

View answer

175. Maximum efficiency of a screw jack for the angle of friction θ, is

1. sin θ/(1 + sin θ)
2. (1 - sinθ)/sin θ
3. (1 + sinθ)/(1 - sin θ)
4. (1 - sin θ)/(1 + sinθ)

View answer

176. Minimum potential energy of a system will be in the position of

1. Stable equilibrium
2. Unstable equilibrium
3. Neutral equilibrium
4. All of the above

View answer

177. Minimum pull in a suspended cable with supports at two ends is equal to

1. Horizontal thrust
2. Support reactions
3. Resultant of horizontal thrust and support reaction
4. Half the weight of the cable

View answer

178. Moment of inertia of a squares of side 'b' about an axis through its centre of gravity, is

1. b³/4
2. b⁴/12
3. b⁴/3
4. b⁴/8

View answer

179. Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

1. Is directly proportional to their velocity of approach
2. Is inversely proportional to their velocity of approach
3. Bears a constant ratio to their velocity of approach
4. Is equal to the sum of their velocities of approach

View answer

180. Newton's Law of Motion is:

1. Everybody continues in its state of rest or of uniform motion in a straight line, unless it is acted upon by some external force
2. The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
3. To every action, there is always an equal and opposite reaction
4. All the above

View answer