101. In a lifting machine with efficiency 60%, an effort of 200 N is required to raise a load of 6 kN. The velocity ratio of the machine is
a) 30
b) 50
c) 60
d) 80
Ans: b
102. Free body diagram is an
a) isolated joint with only body forces acting on it
b) isolated joint with internal forces acting on it
c) isolated joint with all the forces, internal as well as external, acting on it
d) none of the above
Ans: c
103. A system of copianar forces acting on a rigid body can be reduced to
a) one force only
b) one couple only
c) one force and one couple only
d) none of the above
Ans: c
104. A system of copianar forces is in equilibrium when
a) force polygon closes
b) funicular polygon closes
c) both force polygon" and funicular polygon close
d) all the forces are concurrent
Ans: c
105. Force polygon method is applicable for
a) any copianar force system
b) a system of parallel forces only
c) concurrent copianar force system
d) non-concurrent copianar force system
Ans: c
106. The force polygon representing a set of forces in equilibrium is a
a) triangle
b) open polygon
c) closed polygon
d) parallelogram
Ans: c
107. The diagram showing the point of application and line of action of forces in their plane is called
a) vector diagram
b) space diagram
c) force diagram
d) funicular diagram
Ans: b
108. If two forces are in equilibrium, then the forces must
i) be equal in magnitude
ii) be opposite in sense
iii) act along the same line
The correct answer is
a) (i) and (ii)
b) (i) and (iii)
c) only (i)
d) (i), (ii) and (iii)
Ans: d
109. The graphical method of determining the forces in the members of a truss is based on
a) method of joint
b) method of section
c) either method
d) none of the two methods
Ans: a
110. The bending moment in an arch is proportional to
a) vertical ordinate of funicular polygon
b) vertical ordinate of the arch
c) intercept between the arch axis and the funicular polygon
d) none of these
Ans: c
a) 30
b) 50
c) 60
d) 80
Ans: b
102. Free body diagram is an
a) isolated joint with only body forces acting on it
b) isolated joint with internal forces acting on it
c) isolated joint with all the forces, internal as well as external, acting on it
d) none of the above
Ans: c
103. A system of copianar forces acting on a rigid body can be reduced to
a) one force only
b) one couple only
c) one force and one couple only
d) none of the above
Ans: c
104. A system of copianar forces is in equilibrium when
a) force polygon closes
b) funicular polygon closes
c) both force polygon" and funicular polygon close
d) all the forces are concurrent
Ans: c
105. Force polygon method is applicable for
a) any copianar force system
b) a system of parallel forces only
c) concurrent copianar force system
d) non-concurrent copianar force system
Ans: c
106. The force polygon representing a set of forces in equilibrium is a
a) triangle
b) open polygon
c) closed polygon
d) parallelogram
Ans: c
107. The diagram showing the point of application and line of action of forces in their plane is called
a) vector diagram
b) space diagram
c) force diagram
d) funicular diagram
Ans: b
108. If two forces are in equilibrium, then the forces must
i) be equal in magnitude
ii) be opposite in sense
iii) act along the same line
The correct answer is
a) (i) and (ii)
b) (i) and (iii)
c) only (i)
d) (i), (ii) and (iii)
Ans: d
109. The graphical method of determining the forces in the members of a truss is based on
a) method of joint
b) method of section
c) either method
d) none of the two methods
Ans: a
110. The bending moment in an arch is proportional to
a) vertical ordinate of funicular polygon
b) vertical ordinate of the arch
c) intercept between the arch axis and the funicular polygon
d) none of these
Ans: c
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