Question 71. Choose the most appropriate alternative from the options given below to complete the following sentence: Despite several “““““““““ the mission succeeded in its attempt to resolve the conflict.

Question 72. Steam enters an adiabatic turbine operating at steady state with an enthalpy of 3251.0 kJ/kg and leaves as a saturated mixture at 15 kPa with quality (dryness fraction) 0.9. The enthalpies of the saturated liquid and vapor at 15 kPa are hf = 225.94 kJ/kg and hg = 2598.3 kJ/kg respectively. The
mass flow rate of steam is 10 kg/s. Kinetic and potential energy changes are negligible. The power output of the turbine in MW is

Question 73. The following are the data for two crossed helical gears used for speed reduction: Gear I : Pitch circle diameter in the plane of rotation 80 mm and helix angle 30o Gear II : Pitch circle diameter in the plane of rotation 120 mm and helix angle 22.5o If the input speed is 1440 rpm, the output speed in rpm is

Question 74. For an opaque surface, the absorptivity (α) , transmissivity (t) and reflectivity (ρ) are related by the equation:

Question 75. A thin walled spherical shell is subjected to an internal pressure. If the radius of the shell is
increased by 1% and the thickness is reduced by 1%, with the internal pressure remaining the same,
the percentage change in the circumferential (hoop) stress is

Question 76. A solid disc of radius r rolls without slipping on a horizontal floor with angular velocity ω and angular acceleration α. The magnitude of the acceleration of the point of contact on the disc is

Question 77. In a single pass rolling process using 410 mm diameter steel rollers, a strip of width 140 mm and
thickness 8 mm undergoes 10 % reduction of thickness. The angle of bite in radians is

Question 78. In a DC arc welding operation, the voltage-arc length characteristic was obtained as Varc = 20 + 5l where the arc length l was varied between 5 mm and 7 mm. Here Varc denotes the arc voltage in Volts. The arc current was varied from 400 A to 500 A. Assuming linear power source characteristic, the open circuit voltage and the short circuit current for the welding operation are

Question 79. Calculate the punch size in mm, for a circular blanking operation for which details are given below.Size of the blank    25 mmThickness of the sheet  2 mmRadial clearance between punch and die 0.06 mmDie allowance     0.05 mm

Question 80. Two threaded bolts A and B of same material and length are subjected to identical tensile load. If
the elastic strain energy stored in bolt A is 4 times that of bolt B and the mean diameter of bolt A is
12 mm, the mean diameter of bolt B in mm is