Engineering Mechanics Mid - II, March - 2015

1.Mass moment of inertia of a hemisphere is given by
  • Mr2/2
  • 2/5 Mr4
  • 2/5 Mr2
  • none of above
Answer: C
2.Polar moment of inertia is
Answer: D
3.The point through which the whole weight of body acts is
  • center of gravity
  • moment of inertia
  • both a and b
  • none of above
Answer: A
4.Efficiency of a screw is --------- in terms of angle of friction () and angle of screw () when load is lifted up
  • tan / tan( - )
  • tan / tan( + )
  • sin / sin( + )
  • none of the above
Answer: B
5.The length of crossed belt drive depends on
  • sum of radii
  • difference of radii
  • both a and b
  • none of the above
Answer: A
6.Limiting force of force of friction is defined as the frictional force which exists when a body
  • is moving with maximum velocity
  • is at rest
  • just begins to slide over the surface
  • none
Answer: A
7.Kinetic friction is ------------------------- maximum static friction.
  • more than
  • less than
  • equal to
  • none of above
Answer: B
8.When a body slides or rolls along the surface of another body with which it is in contact, the force which tends to oppose the motion of first body is
  • resultant force
  • tangential force
  • frictional force
  • none of the above
Answer: C
9.For maximum power transmission the velocity of belt is given by
Answer: A
10.The center of gravity of a quadrant of an ellipse are given by
  • 2a/3π , 4b/3π
  • 4a/3π , 4b/3π
  • 4a/3π , 2b/3π
  • none of these
Answer: B
11.A body of weight W rests on a horizontal plane. A force P is applied parallel to the plane to move the body then P = ------------
Answer:
12.If T1 = tension on tight side of belt, T2 = tension on slack side of belt, f = coefficient of friction, angle of contact in radians then ratio of tensions on two sides of belt T1/T2 is -----------
Answer:
13.The centroid of a triangle of base ‘b’ and height ‘h’ lies on the axis at a height of ------- from base.
Answer: h/3 from base
14.Volume of revolution is generated by revolving a ----------- about fixed non intersecting axis
Answer: line
15.Radius of gyration of area is given by ----------------
Answer:
16.Unit of product of inertia is ---------
Answer: m4
17.Radius of gyration of circular lamina is --------- where R is radius
Answer: R/1.414
18.Mass moment of inertia of a plate of with b depth d about centroidal axis parallel to X axis with X axis passing through base is
Answer: md2/12
19.Velocity ratio of a differential screw jack is --------------- if P is pitch of larger screw and P’ is pitch of small screw where α is distance between screw and point of application of force
Answer:
20.Centroidal distances can be ______
Answer: positive or negative or zero