Machines and Graphics MCQs | Machines and Graphics Short Questions and Answers

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Questions
41 A cable loaded with 10 kN/m of span is stretched between supports in the same horizontal line 100 m apart. If the central dip is 10 m, then the maximum and minimum pull in the cable respectively are
A 1346.3 kN and 1500 kN
B 1436.2 kN and 1250 kN
C 1346.3 kN and 1250 kN
D 1436.2 kN and 1500 kN

Answer: 1346.3 kN and 1250 kN
42 A light rope is loaded with many equal weights at equal horizontal intervals. The points of suspension on the rope lie on a
A Parabola
B Catenary
C Cycloid
D Ellipse

Answer: Parabola
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43 A particle is dropped from a height of 3 m on a horizontal floor, which has a coefficient of restitution with the ball of 1/2. The height to which the ball will rebound after striking the floor is
A 0.5 m
B 0.75 m
C 1.0 m
D 1.5 m

Answer: 0.75 m
44 Two balls of masses 3 kg and 6 kg are moving with velocities of 4 m/sec and 1 m/sec respectively, towards each other along the line of their centers. After impact the 3 kg ball comes to rest. This can happen only if the coefficient of restitution between the balls is
A 2/3
B 1/5
C 3/5
D 1/3

Answer: 1/5
45 A body is dropped from a height of 100 m and at the same time another body is projected vertically upward with a velocity of 10 m/sec. The two particles will
A Never Meet
B Meet After 1 Sec
C Meet After 5 Sec
D Meet After 10 Sec

Answer: Meet After 10 Sec
46 A shell of mass 100 kg travelling with a velocity of 10 m/sec breaks into two equal pieces during an explosion which provides an extra kinetic energy of 20000 Joules. If the pieces continue to move in the same direction as before, then the speed of the faster one must be
A 20 m/sec
B 30 m/sec
C 40 m/sec
D 50 m/sec

Answer: 30 m/sec
47 If a flywheel increases its speed from 10 rpm to 20 rpm in 10 seconds, then its angular acceleration is
A —rad/sec 10
B —rad/sec 20
C —rad/sec 30
D None Of The Above

Answer: —rad/sec 30
48 Two objects moving with uniform speeds are 5 m apart after 1 second when they move towards each other and are 1 m apart when they move in the same direction. The speeds of the objects are
A 2 m/sec and 2 m/sec
B 3 m/sec and 2 m/sec
C 3 m/sec and 3 m/sec
D 4 m/sec and 6 m/sec

Answer: 3 m/sec and 2 m/sec
49 The condilion for a lifting machine to be reversible is that its efficiency should be
A less than 50%
B more than 50%
C more than 66.67%
D equal to 100%

Answer: more than 50%
50 In a lifting machine a weight of 5 kN is lifted through 200 mm by an effort of 0.1 kN moving through 15 m. The mechanical advantage and velocity ratio of the machine are respectively
A 50 and 75
B 75 and 50
C 75 and 75
D 50 and 50

Answer: 50 and 75
51 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

Answer: one force and one couple only
52 The force polygon representing a set of forces in equilibrium is a
A Triangle
B Open Polygon
C Closed Polygon
D Parallelogram

Answer: Closed Polygon
53 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

Answer: Intercept Between The Arch Axis And The Funicular Polygon
54 An ordinate in a funicular polygon represents
A Shear Force
B Resultant Force
C Bending Moment
D Equilibrium

Answer: Bending Moment
55 A funicular polygon cannot be made to pass through
A One Specified Point
B Two Specified Points
C Three Specified Points
D More Than Three Specified Points

Answer: More Than Three Specified Points
56 If a set of given forces are such that their free vectors build a closed polygon, then
A the resultant force and resultant couple are always zero
B the resultant force is zero but resultant couple is not zero
C the resultant force is zero but resultant couple may not be zero
D the resultant force and resultant couple both may not be zero

Answer: the resultant force is zero but resultant couple may not be zero
57 Williot-Mohr diagram is used to determine deflection in
A Trusses Only
B Beam Only
C Rigid Frames Only
D Any Type Of Structure

Answer: Trusses Only
58 The condition of equilibrium for any system of forces in a plane is
A that polygon of forces must close
B that resultant couple must be zero
C both (a) and (b)
D none of the above

Answer: both (a) and (b)
59 The pole distance is measured in
A Distance Scale
B Force Scale
C Mass Scale
D Time Scale

Answer: Force Scale
60 If y is force and x is velocity, then dimensions of —=r are dx2
A M'^T'
B M'L-'T0
C M'L-'T1
D All above

Answer: M'L-'T0

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