Image
ইঞ্জিনিয়ারিং মেকানিক্স MCQ
67. In order to determine the effects of a fore, acting on a body we must know-
magnitude of the force
line of action of the force
nature of the force i, e whether the force is push or pull
all of these
68. Limiting force of friction is the-
tangent of angle between normal reaction and the resultant of normal reaction and limiting friction
ratio of limiting friction and normal reaction
the friction force acting when the body is just about to move
the friction force acting when the body is in motion
70. 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-
two members with unknown forces of the frame
three members with unknown forces of the frame
four members with unknown forces of the frame
three members with known forces of the frame
74. Kinetic friction is the-
tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
ratio of limiting friction and normal reaction
the friction force acting when the body is just about to move
the friction force acting when the body is in motion
78. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span-
2.5cm
3.0cm
4.0cm
5.0cm