EEMC_15

EEMC_2015

51. The centre of gravity of a quadrant of a circle lies along its central radius r at a distance of- B) 0.6 r

52. The efficiency of a screw jack is maximum, when - B) α=45°- φ/2

53. The maximum mechanical advantage of a lifting machine is - C) 1/m

54. For a self locking machine the efficiency must be - B) less than 50%

55. A stone after falling 4 seconds from rest, its velocity will be- B) 39.24m/sec

56. The ability of a materials to resist deformation is said to be- B) toughness

57. A couple produces- C) combination of (A) and (B) [A) rotational motion and B) translator motion]

58. Velocity ratio of a differential wheel and axle compared to that of simple wheel and axle is - B) twice

59. The C.G of an equilateral triangle with each side a from any of the tree side is - D) a√3/2

60. Newton’s 2 nd Law of Motion gives a relation between force, mass and – C) acceleration

61. A particle is projected with a velocity ‘u’ making an angle 30° with the horizontal. Vertical velocity of the particle at the highest point is - B) Zero

62. A body of mass 2kg is moving with a velocity of 50 m/sec. The K.E. of the body is - A) 2500 N-M

63. The resultant of two forces 10N and 5 N acting at right angles to each other is- A) 11.18 N

64. The resolved part along X axis of 15 N force is making angle 60° with Y axis is – A) 13 N

65. Moment of Inertia of a hollow section about its polar axis is - C) two times

66. The range of a projectile will be maximum for a given magnitude of initial velocity when the projection angle is -- -- with the horizontal.-- C) 45°

67. A steel bar of 5m is heated from 20° C to 45° C and it is free to expand. The bar will induce- A) Tensile stress

68. Which one of the following has the dimension of Power- A) ML2T-3

69. Out of the following derived unit is - B) Newton

70. The angle of repose is equal to ---- D) angle of friction

71 When a rectangular bar length l, breadth b nad thickness t is subjected to an axial pull of P then linear strain is given by - C) P/btE

72. A bar of length L meter extends by 1 mm under a tensile force of P kg. The strain produced in the bar is - C) 0.001 x 1/L

73. Resultant of couple and a given force is equal to - C) a force equal to the given force with linear displacement

74. For a ‘Reversible Machine’ the efficiency shall be – A) More than 50%

75. With usual notations the effort lost due to friction is given by – A) P- W/V.R

76. From a rectangular thin lamina if a triangular part is taken out from right side top corner the centroid of the remaining part of the lamina will be shifted towards- B) left and dowenward

77. The required horizontal force for resisting a body from sliding downward in an inclined plane of angle α with angle of repose Φ is given by - B) P= W (tanα - tanΦ )

78. If three forces acting on a body keeps the body in equilibrium, then- B) They must meet at a point

79. The required horizontal force for siding a body upward on an inclined plane of angle α with angle of repose Φ is given by- C) P= W (tanα + tanΦ )

80. In an inclined plane the frictional force always acts – D) against the tendency of motion of the object.

81. For an annular circular lamina of external diameter d1 and internal diameter d2, the radius of gyration about any diameter is - C) √(d1 ²-d2 ²)/4

82. For a differential wheel and axle if the diameter of the wheel is 60 cm and the diameter of the axles be 25 cm and 15 cm respectively, the velocity Ratio is - A) 12

83. Maximum efficiency of a simple lifting machine is - D) m/V.R

84. The co-ordinate of centroid of a semicircular lamina of radius R with X axis be the axis of symmetry and origin at center of curvature of the semicircle, is given by - B) (0, 4R/3π)

85. Resultant of two equal unlike non- concurrent parallel forces (each P) is - C) they will constitute a couple

86. Hooke’s Law is applicable within- A) Elastic limit

87. If for a linear member temperature is increased and the member is free to expand, the stress developed in the member is - B) tensile

88. For a cantilever beam subjected to transverse load maximum bending moment occurs at - D) cannot be said without further investigation

89. When displacement occurs in the perpendicular direction of applied force, the work done is - A) 0

90. Metric Horce Power is equal to - B) 746 watt

91. If the algebraic sum of momentum of a heavier and a lighter object after collision is zero. Whereas the individual velocitys of them are non zero; the kinetic energy of heavier object is - B) less than kinetic energy of lighter object.

92. For a freely falling body the sum of Potential Energy and Kinetic Energy is - C) constant everywhere.

93. The resultant of two unequal parallel forces lies- C) near the larger force outward.

94. If P and Q two forces acting at an angle (90°-α) to each other, then their resultant R is lined to P at an angle θ such that tanθ is equal to - A) Q cos α/(P+Qsinα)

95. In polygon law of forces the closed sides of polygon represents force in - B) magnitude and dirction

96. For a T beam centroid of cross section is located at - B) y- axis

97. For a uniform ladder resting in equilibrium, with one side resting on a wall other side on floor, for stability - C) both floor and wall must be rough.

98. The adventage of use of differential machine in place of simple machine is - C) Efficiency high

99. When a roller is pushed on ground by application of horizontal force along the center of the roller to topple a barrier by rolling; at the point of topping the reaction at the contact point on the ground is - B) zero

100. As per Lami’s theorem, in case of equilibrium of three forces acting at a point, each force is proportional to - D) sine of angle between other two