Q. An engine working on air standard Otto cycle is supplied with air at 0.1 MPa and 35°C. The compression ratio is 8. The heat supplied is 500 kJ/kg.    Property data for air: cp = 1.005 kJ/kg K, cv = 0.718 kJ/kg K, R = 0.287 kJ/kg K. The maximum temperature (in K) of the […]

Q. Steam flows through a nozzle at a mass flow rate of  m = 0.1kg/s with a heat loss of 5 kW. The enthalpies at inlet and exit are 2500kJ/kg and 2350 kJ/kg, respectively. Assuming negligible velocity at inlet ( C1 » 0 ), the velocity ( C2 ) of steam (in m/s) at the nozzle

Q. A tank of volume 0.05 m3 contains a mixture of saturated water and saturated steam at 200°C. The mass of the liquid present is 8 kg.  The entropy (in kJ/kg K) of the mixture is (correct to two decimal places). Property data for saturated steam and water are: At 200°C, psat = 1.5538 MPa

Q. A solid block of 2.0 kg mass slides steadily at a velocity V along a vertical wall as shown in the figure below. A thin oil film of thickness h = 0.15 mm provides lubrication between the block and the wall. The surface area of the face of the block in contact with the

Q. A sprinkler shown in the figure rotates about its hinge point in a horizontal plane due to water flow discharged through its two exit nozzles. The total flow rate Q through the sprinkler is 1 litre/sec and the cross-sectional area of each exit nozzle is 1 cm2. Assuming equal flow rate through both arms

Q. A slider crank mechanism is shown in the figure. At some instant, the crank angle is 45o and a force of 40 N is acting towards the left on the slider. The length of the crank is 30 mm and the connecting rod is 70 mm. Ignoring the effect of gravity, friction and inertial

Q. A machine of mass 𝑚 = 200 kg is supported on two mounts, each of stiffness 𝑘 = 10 kN/m. The machine is subjected to an external force (in N) 𝐹(𝑡) = 50 cos 5𝑡. Assuming only vertical translatory motion, the magnitude of the dynamic force (in N) transmitted from each mount to the

Q. A simply supported beam of width 100 mm, height 200 mm and length 4 m is carrying a uniformly distributed load of intensity 10 kN/m. The maximum bending stress (in MPa) in the beam is (correct to one decimal place). Ans: 29.8 – 30.1

Q. The percentage scrap in a sheet metal blanking operation of a continuous strip of sheet metal as shown in the figure is_____________(correct to two decimal places). Ans: 53.25

Q. The maximum reduction in cross-sectional area per pass ( R ) of a cold wire drawing process is R = 1 – e-(n+1) , where n represents the strain hardening coefficient. For the case of a perfectly plastic material, R is (A) 0.865                    (B) 0.826                    (C) 0.777                   (D) 0.632 Ans: 0.632