Question 81. The eigenvalues of a symmetric matrix are all

Question 82. In orthogonal turning of a bar of 100 mm diameter with a feed of 0.25 mm/rev, depth of cut of 4 mm and cutting velocity of 90 m/min, it is observed that the main (tangential) cutting force is perpendicular to the friction force acting at the chip-tool interface. The main (tangential) cutting force is 1500 N. The orthogonal rake angle of the cutting tool in degree is

Question 83. In orthogonal turning of a bar of 100 mm diameter with a feed of 0.25 mm/rev, depth of cut of 4 mm and
cutting velocity of 90 m/min, it is observed that the main (tangential) cutting force is perpendicular to the
friction force acting at the chip-tool interface. The main (tangential) cutting force is 1500 N. The normal force acting at the chip-tool interface in N is

Question 84. Complete the sentence: Universalism is to particularism as diffuseness is to _______________.

Question 85. In a simple Brayton cycle, the pressure ratio is 8 and temperatures at the entrance of compressor and
turbine are 300 K and 1400 K, respectively. Both compressor and gas turbine have isentropic efficiencies
equal to 0.8. For the gas, assume a constant value of cp (specific heat at constant pressure) equal to 1 kJ/kgK
and ratio of specific heats as 1.4. Neglect changes in kinetic and potential energies. The power required by the compressor in kW/kg of gas flow rate is

Question 86. In a simple Brayton cycle, the pressure ratio is 8 and temperatures at the entrance of compressor and
turbine are 300 K and 1400 K, respectively. Both compressor and gas turbine have isentropic efficiencies
equal to 0.8. For the gas, assume a constant value of cp (specific heat at constant pressure) equal to 1 kJ/kgK
and ratio of specific heats as 1.4. Neglect changes in kinetic and potential energies. The thermal efficiency of the cycle in percentage (%) is

Question 87. For steady, fully developed flow inside a straight pipe of diameter D, neglecting gravity effects, the pressure drop ∆p over a length L and the wall shear stress tw are related by

Question 88. In a rolling process, the state of stress of the material undergoing deformation is

Question 89. The pressure, dry bulb temperature and relative humidity of air in a room are 1 bar, 30°C and 70%, respectively. If the saturated steam pressure at 30°C is 4.25 kPa, the specific humidity of the room air in kg water vapour/kg dry air is

Question 90. For a ductile material, toughness is a measure of