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 an...