1. 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
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Correct Answer:
4.0 cm
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2. Along the neutral axis of a simply supported beam
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Correct Answer:
Fibres do not undergo strain
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3. The ratio of strengths of solid to hollow shafts, both having outside diameter D and hollow having inside diameter D/2, in torsion, is
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Correct Answer:
15/15
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4. According to principle of moments
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Correct Answer:
If a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
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5. The stress in the wall of a cylinder in a direction normal to its longitudinal axis, due to a force acting along the circumference, is known as
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Correct Answer:
Hoop stress
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6. A simply supported beam (l + 2a) with equal overhangs carries a uniformly distributed load over the whole length, the B.M. changes sign if
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Correct Answer:
L > 2a
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7. A force acting on a body may
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Correct Answer:
All of the above
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8. Strain energy of a member may be equated to
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Correct Answer:
½ (stress)2 × volume of the member + Young's modulus E
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9. Struts are load carrying members of a frame structure which are subjected to
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Correct Answer:
Axial compressive loads
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10. The C.G. of a plane lamina will not be at its geometrical centre in the case of a
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Correct Answer:
Right angled triangle
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11. A cantilever carries is uniformly distributed load W over its whole length and a force W acts at its free end upward. The net deflection of the free end will be
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Correct Answer:
(5/24) (WL3/EI) upward
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12. The B.M. of a cantilever beam shown in below figure at A, is
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Correct Answer:
Zero
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13. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to
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Correct Answer:
50
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14. The maximum deflection of
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Correct Answer:
All the above
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15. The phenomenon of slow extension of materials having constant load, i.e. increasing with the time is called
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Correct Answer:
Creeping
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16. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be
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Correct Answer:
Zero at its upper end
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17. Ties are load carrying members of a frame, which are subjected to
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Correct Answer:
Axial tension loads
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18. The radius of gyration of a rectangular section is not proportional to
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Correct Answer:
None of these
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19. The units of moment of inertia of an area are
Answer
Correct Answer:
M4
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20. A cast iron T section beam is subjected to pure bending. For maximum compressive stress to be three times the maximum tensile stress, centre of gravity of the section from flange side is
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Correct Answer:
H/4
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21. Influence lines are drawn for structures
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Correct Answer:
Of any type
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22. Which of the following is not a scalar quantity?
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Correct Answer:
Acceleration
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23. The stress necessary to initiate yielding, is considerably
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Correct Answer:
More than that necessary to continue it
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24. The slenderness ratio of a vertical column of a square cross-section of 2.5 cm sides and 300 cm length, is
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Correct Answer:
416
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25. Forces are called coplanar when all of them acting on body lie in
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Correct Answer:
One plane
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26. The property by which a body returns to its original shape after removal of the force, is called
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Correct Answer:
Elasticity
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27. In the cantilever truss as shown in below figure, the horizontal component of the reaction at A, is
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Correct Answer:
30 tonnes
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28. In the lever of third order, load W, effort P and fulcrum F are oriented as follows
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Correct Answer:
W between P and F
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29. A closely coiled helical spring of radius R, contains n turns and is subjected to an axial load W. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the deflection of the coil is
Answer
Correct Answer:
4WR3n/Cr4
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30. The property of a material by which it can be beaten or rolled into thin plates, is called
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Correct Answer:
Malleability
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31. Dynamic friction as compared to static friction is
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Correct Answer:
Less
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32. Pick up the correct assumption of the theory of simple bending
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Correct Answer:
All the above
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33. In rectangular columns (cross-section b × h), the core is a
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Correct Answer:
Rhombus of diagonals b/3 and h/3
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34. A cantilever beam rectangular in cross-section is subjected to an isolated load at its free end. If the width of the beam is doubled, the deflection of the free end will be changed in the ratio of
Answer
Correct Answer:
1/2
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35. The resultant of the following three couples 20 kg force, 0.5 m arm, +ve sense 30 kg force, 1 m arm, -ve sense 40 kg force, 0.25 m arm, +ve sense having arm of 0.5 m will be
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Correct Answer:
20 kg, -ve sense
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36. A diagram which shows the variations of the axial load for all sections of the span of a beam, is called
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Correct Answer:
Thrust diagram
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37. The force in DB of the truss shown in below figure is
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Correct Answer:
W tension
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38. Center of gravity of a solid cone lies on the axis at the height
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Correct Answer:
One-fourth of the total height above base
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39. In a shaft shear stress intensity at a point is not
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Correct Answer:
Inversely proportional to the distance from the axis
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40. If a shaft is rotating N revolutions per minute with an applied torque T kg-m, the horse power being transmitted by the shaft, is
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Correct Answer:
2 /4500
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41. Which of the following is not the unit of work, energy and heat?
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Correct Answer:
Hp
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42. At either end of a plane frame, maximum number of possible bending moments, are
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Correct Answer:
Zero
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43. The ratio of the maximum deflections of a beam simply supported at its ends with an isolated central load and that of with a uniformly distributed load over its entire length, is
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Correct Answer:
24/15
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44. Forces are called concurrent when their lines of action meet in
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Correct Answer:
One point
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45. Shear deflection of a cantilever of length L, cross sectional area A and shear modulus G, under a concentrated load W at its free end, is
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Correct Answer:
(3/2) (WL/AG)
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46. If two forces acting at a joint are not along the straight line, then for the equilibrium of the joint
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Correct Answer:
Each force must be zero
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47. In the given below figure, the rivets with maximum stress, are:
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Correct Answer:
2 and 4
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48. In actual machines
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Correct Answer:
Mechanical advantage is less than velocity ratio
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49. In a loaded beam, the point of contraflexure occurs at a section where
Answer
Correct Answer:
Bending moment is zero or changes sign
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50. The C.G. of a solid hemisphere lies on the central radius 3r
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Correct Answer:
At distance from the plane base or
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51. For keeping the stress wholly compressive the load may be applied on a circular column anywhere within a concentric circle of diameter
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Correct Answer:
D/4
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52. The type of butt joints in common use, is:
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Correct Answer:
Single inverted V-butt joint
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53. Tangent of angle of friction is equal to
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Correct Answer:
Coefficient of friction
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54. Pick up the correct statement from the following:
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Correct Answer:
Both and
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55. The structure shown in below figure is stable, if
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Correct Answer:
X) = y
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56. In the equation of virtual work, following force is neglected
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Correct Answer:
All of the above
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57. A joint of a frame is subjected to three tensile forces P, Q and R equally inclined to each other. If P is 10 tonnes, the other forces will be
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Correct Answer:
Q and R each is equal to 10 tonnes
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58. When equal and opposite forces applied to a body, tend to elongate it, the stress so produced, is called
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Correct Answer:
Tensile stress
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59. A framed structure is perfect if it contains members equal to
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Correct Answer:
2n
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60. During a tensile test on a ductile material
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Correct Answer:
True stress at fracture is higher than the ultimate stress
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61. The force in BD of the truss shown in below figure is:
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Correct Answer:
500 kg compressive
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62. Which of the following is not the unit of pressure?
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Correct Answer:
Newton
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63. The maximum bending moment due to a moving load on a simply supported beam, occurs
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Correct Answer:
Under the load
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64. The unit of power in S.I. units is
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Correct Answer:
Watt
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65. The maximum stress intensity due to a suddenly applied load is x-times the stress intensity produced by the load of the same magnitude applied gradually. The value of x is
Answer
Correct Answer:
2
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66. When loads are applied proportionately to a frame structure containing its members in one plane, the structure is called
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Correct Answer:
Space frame
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67. The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of
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Correct Answer:
Repose
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68. The force in member U2L2 of the truss shown in below figure, is
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Correct Answer:
10 T compression
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69. The coefficient of friction depends upon
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Correct Answer:
Nature of surfaces
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70. The intensity of direct longitudinal stress in the cross-section at any point distant r from the neutral axis, is proportional to
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Correct Answer:
R
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71. A closely coiled helical spring of radius R, contains n turns and is subjected to an axial loadW. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the stress developed in the helical spring is
Answer
Correct Answer:
2WR/ 3
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72. The coefficient of friction depends on
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Correct Answer:
Nature of surface
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73. A beam is said to be of uniform strength, if
Answer
Correct Answer:
Bending stress is same at every section along its longitudinal axis
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74. A rectangular bar of width b and height h is being used as a cantilever. The loading is in a plane parallel to the side b. The section modulus is
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Correct Answer:
Bh²/6
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75. Center of gravity of a thin hollow cone lies on the axis at a height of
Answer
Correct Answer:
One-third of the total height above base
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76. If is the shear force at a section of an I-joist, having web depth and moment of inertia about its neutral axis, the difference between the maximum and mean shear stresses in the web is,
Answer
Correct Answer:
Sd²/24I
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77. The greatest eccentricity which a load W can have without producing tension on the cross-section of a short column of external diameter D and internal diameter d, is
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Correct Answer:
(D² + d²)/8D
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78. Which of the following is not a vector quantity?
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Correct Answer:
Weight
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79. A ____ is an electronic circuit
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Correct Answer:
Voltage limiter
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80. Metal patterns are used for
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Correct Answer:
Large scale production of castings
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81. The limit of eccentricity is based upon no tension condition.
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Correct Answer:
True
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82. When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the
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Correct Answer:
Bottom layer
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83. The point of contraflexure is a point where
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Correct Answer:
Bending moment changes sign
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84. The maximum stress produced in a bar of tapering section is at
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Correct Answer:
Smaller end
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85. The rectangular beam 'A' has length l, width b and depth d. Another beam 'B' has the same length and depth but width is double that of 'A'. The elastic strength of beam 'B' will be __________ as compared to beam A.
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Correct Answer:
Double
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86. When a column is subjected to an eccentric load, the stress induced in the column will be
Answer
Correct Answer:
Direct and bending stress both
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87. The energy stored in a body when strained within elastic limit is known as
Answer
Correct Answer:
Strain energy
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88. The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.
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Correct Answer:
Twice
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89. Two closely-coiled helical springs 'A' and 'B' of the same matenal, same number of turns and made from same wire are subjected to an axial load W. The mean diameter of spring 'A' is double the mean diameter of spring 'B'. The ratio of deflections in spring 'B' to spring 'A' will be
Answer
Correct Answer:
1/8
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90. The thermal stress __________ upon the cross-sectional area of the bar.
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Correct Answer:
Does not depend
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91. Strain resetters are used to
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Correct Answer:
Measure linear strain
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92. The deformation per unit length is called
Answer
Correct Answer:
Strain
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93. In compression test, the fracture in cast iron specimen would occur along
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Correct Answer:
An oblique plane
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94. A reinforced cement concrete beam is considered to be made of
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Correct Answer:
Hetrogeneous material
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95. The neutral axis of the cross-section a beam is that axis at which the bending stress is
Answer
Correct Answer:
Minimum
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96. A column that fails due to direct stress, is called
Answer
Correct Answer:
Short column
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97. When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as __________ double cover butt joint.
Answer
Correct Answer:
Double riveted
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98. Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m. The shaft 'B' has the greater diameter.
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Correct Answer:
False
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99. The object of caulking in a riveted joint is to make the joint
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Correct Answer:
Leak-proof
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100. A beam encastered at both the ends is called
Answer
Correct Answer:
Fixed beam
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