1. Turning metals into automobiles is work that falls within the ________
Answer
Correct Answer:
Secondary sector
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2. A column is said to be of medium size if its slenderness ratio is between
Answer
Correct Answer:
32 and 120
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3. For a simply supported beam of length , the bending moment is described as M = a (x- x3/L2), x < L; where is a constant. The shear force will be zero at The supports
Answer
Correct Answer:
X = L/3
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4. A projectile is fired at an angle to the vertical. Its horizontal range will be maximum when is
Answer
Correct Answer:
45°
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5. If b is the width of a plate joined by diamond riveting of diameter d, the efficiency of the joint is given by
Answer
Correct Answer:
(b - d)/b
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6. A beam of length L is pinned at both ends and is subjected to a concentrated bending couple of moment M at its centre. The maximum bending moment in the beam is
Answer
Correct Answer:
M
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7. If the stress produced by a prismatic bar is equal to the working stress, the area of the crosssection of the prismatic bar, becomes
Answer
Correct Answer:
Infinite
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8. The reaction at the supports will be vertical to the plane of the support if the frame structure rests on
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Correct Answer:
All the above
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9. The units of moment of inertia of mass are
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Correct Answer:
Kg m²
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10. For a stable frame structure, number of members required, is
Answer
Correct Answer:
Twice the number of joints minus three
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11. A reinforced concrete beam is assumed to be made of
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Correct Answer:
Heterogeneous material
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12. When trying to turn a key into a lock, following is applied
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Correct Answer:
Couple
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13. A member is balanced at its end by two inclined members carrying equal forces. For equilibrium the angle between the inclined bars must be
Answer
Correct Answer:
120°
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14. For a simply supported beam with a central load, the bending moment is
Answer
Correct Answer:
Maximum at the centre
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15. Which one of the following statements is not correct?
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Correct Answer:
The sine of the angle of repose is equal to coefficient to friction
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16. The bending moment is maximum on a section where shearing force
Answer
Correct Answer:
Changes sign
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17. The deflection due to couple M at the free end of a cantilever length L is
Answer
Correct Answer:
ML²/2EI
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18. According to law of triangle of forces
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Correct Answer:
If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
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19. The ratio of the tensile stress developed in the wall of a boiler in the circumferential direction to the tensile stress in the axial direction, is
Answer
Correct Answer:
2
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20. Stress in a beam due to simple bending, is
Answer
Correct Answer:
Directly proportional
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21. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly
Answer
Correct Answer:
62.5 m
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22. A member which is subjected to reversible tensile or compressive stress may fail at a stress lower than the ultimate stress of the material. This property of metal, is called
Answer
Correct Answer:
Fatigue of the metal
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23. A three hinged parabolic arch hinged at the crown and springing, has a horizontal span of 4.8 m and a central rise of 1 m. It carries a uniformly distributed load of 0.75 tonne per metre over half left hand span. The horizontal thrust at the support will be
Answer
Correct Answer:
1.08 tonnes
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24. The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be
Answer
Correct Answer:
3r/2
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25. If the width b and depth d of a beam simply supported with a central load are interchanged, the deflection at the centre of the beam will be changed in the ratio of
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Correct Answer:
(b/d)2
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26. The shear stress at any section of a shaft is maximum
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Correct Answer:
At the top of the surface
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27. The forces, which meet at one point, but their lines of action do not lie in a plane, are called
Answer
Correct Answer:
Non-coplanar concurrent forces
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28. The moment diagram for a cantilever carrying a concentrated load at its free end, will be
Answer
Correct Answer:
Triangle
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29. If the shear force along a section of a beam is zero, the bending moment at the section is
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Correct Answer:
Maximum
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30. A single force and a couple acting in the same plane upon a rigid body
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Correct Answer:
Cannot balance each other
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31. The areas of cross-section of a square beam and a circular beam subjected to equal bending moments, are same.
Answer
Correct Answer:
Square beam is more economical
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32. A three-hinged arch is said to be:
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Correct Answer:
Statically determinate structure
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33. Frictional force encountered after commencement of motion is called
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Correct Answer:
Dynamic friction
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34. A solid circular shaft of diameter d is subjected to a torque T. The maximum normal stress induced in the shaft, is
Answer
Correct Answer:
16T/ 3
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35. The materials which have the same elastic properties in all directions, are called
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Correct Answer:
Isotropic
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36. If a rigid body is in equilibrium under the action of three forces, then
Answer
Correct Answer:
Both and above
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37. For a beam having fixed ends, the unknown element of the reactions, is
Answer
Correct Answer:
Horizontal and vertical components at both the ends
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38. According to Unwin's formula, the diameter of a rivet of plate of thickness is :
Answer
Correct Answer:
D = 6.05 t
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39. Pick up the incorrect statement from the following:
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Correct Answer:
The C.G. of a semicircle is at a distance of r/2 from the center
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40. The section modulus of a rectangular section is proportional to
Answer
Correct Answer:
Area of the section
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41. For structural analysis of forces, the method refers to
Answer
Correct Answer:
Moment-area-theorem
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42. The weight of a body is due to
Answer
Correct Answer:
Gravitational force of attraction towards the centre of the earth
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43. Shear force for a cantilever carrying a uniformly distributed load over its length, is
Answer
Correct Answer:
Rectangle
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44. A simply supported beam carrying a uniformly distributed load over its whole span, is propped at the centre of the span so that the beam is held to the level of the end supports. The reaction of the prop will be
Answer
Correct Answer:
5/8th the distributed load
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45. If three forces acting in different planes can be represented by a triangle, these will be in
Answer
Correct Answer:
Non-equilibrium
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46. The following assumption is not true in the theory of pure torsion:
Answer
Correct Answer:
All radii get twisted due to torsion
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47. A simply supported beam of span L carries a concentrated load W at its mid-span. The maximum bending moment M is
Answer
Correct Answer:
WL/4
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48. The possible loading in various members of framed structures are
Answer
Correct Answer:
Compression or tension
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49. The force in the member DE of the truss shown in below figure will be
Answer
Correct Answer:
2 W compressive
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50. The ratio of elongations of a conical bar due to its own weight and that of a prismatic bar of the same length, is
Answer
Correct Answer:
1/3
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51. Which of the following is not the unit of power?
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Correct Answer:
Kcal/kg sec
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52. The equivalent length of a column fixed at both ends, is
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Correct Answer:
0.5 l
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53. And are numbers of members and joints in a frame. It contains redundant members if
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Correct Answer:
N > 2j - 3
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54. The algebraic sum of moments of the forces forming couple about any point in their plane is
Answer
Correct Answer:
Equal to the moment of the couple
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55. Simple bending equation is
Answer
Correct Answer:
M/I = E/R = F/Y
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56. While testing a cast iron beam (2.5 cm × 2.5 cm) in section and a metre long simply supported at the ends failed when a 100 kg weight is applied at the centre. The maximum stress induced is:
Answer
Correct Answer:
960 kg/cm2
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57. The product of either force of couple with the arm of the couple is called
Answer
Correct Answer:
Moment of the couple
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58. For a beam of uniform strength keeping its depth constant, the width will vary in proportion to
Answer
Correct Answer:
Bending moment (M)
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59. The law which states, "Within elastic limits strain produced is proportional to the stress producing it", is known as
Answer
Correct Answer:
Hooke's law
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60. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of
Answer
Correct Answer:
Resolution of forces
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61. The moment diagram for a cantilever whose free end is subjected to a bending moment, will be a
Answer
Correct Answer:
Rectangle
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62. In a beam, the neutral plane
Answer
Correct Answer:
Does not change during deformation
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63. Which of the following is not the unit of energy?
Answer
Correct Answer:
Watt
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64. The maximum load to which a fillet joint of length can be subjected to, is
Answer
Correct Answer:
0.7 × S × fillet size × L
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65. The shape of the bending moment diagram over the length of a beam, carrying a uniformly distributed load is always
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Correct Answer:
Parabolic
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66. Pick up wrong statement about friction force for dry surfaces. Friction force is
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Correct Answer:
Proportional to velocity of sliding
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67. The weakest section of a diamond riveting, is the section which passes through
Answer
Correct Answer:
First row
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68. Center of percussion is
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Correct Answer:
The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis Point of suspension
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69. The stiffness factor for a prismatic beam of length L and moment of inertia I, is
Answer
Correct Answer:
IE/L
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70. In a three hinged arch, the third hinge is generally kept at
Answer
Correct Answer:
Crown of the arch
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71. A force is completely defined when we specify
Answer
Correct Answer:
All of the above
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72. For a channel section, the shear centre lies at a distance of
Answer
Correct Answer:
D²b²t/4I
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73. The C.G. of a right circular solid cone of height h lies at the following distance from the base
Answer
Correct Answer:
H/4
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74. The shape of the bending moment diagram over the length of a beam, carrying a uniformly increasing load, is always
Answer
Correct Answer:
Cubical
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75. An arch may be subjected to
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Correct Answer:
Thrust, shear force and bending moment
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76. For the same height, the bottom width for no tension,
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Correct Answer:
For triangular section is same as that of a rectangular section
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77. The range within which a load can be applied on a rectangular column, to avoid any tensile stress, is
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Correct Answer:
One-fifth of the base
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78. D' Alembert's principle is used for
Answer
Correct Answer:
Reducing the problem of kinetics to equivalent statics problem
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79. The effect of arching a beam, is
Answer
Correct Answer:
To reduce the bending moment throughout
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80. Effect of a force on a body depends upon
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Correct Answer:
All of the above
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81. Strain energy of any member may be defined as work done on it
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Correct Answer:
All the above
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82. As compared to uniaxial tension or compression, the strain energy stored in bending is only
Answer
Correct Answer:
1/3
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83. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one
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Correct Answer:
Hyperbola
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84. The width b and depth d of a beam cut from a wooden cylindrical log of 100 cm diameter for maximum strength are:
Answer
Correct Answer:
B = 57.73 cm d = 81.65 cm
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85. If a constant section beam is subjected to a uniform bending moment throughout, its length bends to
Answer
Correct Answer:
A circular arc
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86. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction
Answer
Correct Answer:
At an angle equal to the angle of friction to the inclined plane
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87. If a steel rod of 20 mm diameter and 5 metres long elongates by 2.275 mm when subjected to an axial pull of 3000 kg, the stress developed, is
Answer
Correct Answer:
955.41 kg/cm2
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88. A simply supported wooden beam 150 cm long and having a cross section 16 cm × 24 cm carries a concentrated load, at the centre. If the permissible stress ft = 75 kg/cm2 and fs= 10 kg/cm2 the safe load is
Answer
Correct Answer:
3075 kg
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89. Two non-collinear parallel equal forces acting in opposite direction
Answer
Correct Answer:
Constitute a couple
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90. Failure of riveted joints is due to
Answer
Correct Answer:
All the above
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91. If a member carries a tensile force P on its area of cross-section A, the normal stress introduced on
Answer
Correct Answer:
(P/A
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92. Which is the correct statement about law of polygon of forces?
Answer
Correct Answer:
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
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93. In a simply supported beam L with a triangular load W varying from zero at one end to the maximum value at the other end, the maximum bending moment is
Answer
Correct Answer:
WL3
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94. The energy stored in a beam of length subjected to a constant B.M. is
Answer
Correct Answer:
M²L/2EI
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95. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal
Answer
Correct Answer:
Density of metal can't be determined
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96. The principal stresses at a point are 100, 100 and -200 kgf/cm2 , the octahedral shear stress at the point is:
Answer
Correct Answer:
100 kg/cm2
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97. The ratio of the moment of inertia of a circular plate and that of a square plate for equal depth, is
Answer
Correct Answer:
Equal
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98. Coulomb friction is the friction between
Answer
Correct Answer:
Bodies having relative motion
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99. A composite member shown in below figure was formed at 25°C and was made of two materials a and b. If the coefficient of thermal expansion of a is more than that of b and the composite member is heated upto 45°C, then
Answer
Correct Answer:
A will be in compression and b in tension
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100. In case of an eccentric loading on a bracket subjected to moment M, the tangential force developed in any rivet, at right angles to its radius vector r is
Answer
Correct Answer:
Mr/ r²
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101. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20
Answer
Correct Answer:
3.0 cm
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