Q. Water flowing at the rate of 1 kg/s through a system is heated using an electric heater such that the specific enthalpy of the water increases by 2.50 kJ/kg and the specific entropy increases by 0.007 kJ/kg·K. The power input to the electric heater is 2.50 kW. There is no other work or heat […]
Q. Hot and cold fluids enter a parallel flow double tube heat exchanger at 100 °C and 15 °C, respectively. The heat capacity rates of hot and cold fluids are Ch = 2000 W/K and Cc = 1200 W/K, respectively. If the outlet temperature of the cold fluid is 45 °C, the log mean temperature
Q. Three sets of parallel plates LM, NR and PQ are given in Figures 1, 2 and 3. The view factor FIJ is defined as the fraction of radiation leaving plate I that is intercepted by plate J. Assum that the values of FLM and FNR are 0.8 and 0.4, respectively. The value of FPQ
Q. The aerodynamic drag on a sports car depends on its shape. The car has a drag coefficient of 0.1 with the windows and the roof closed. With the windows and the roof open, the drag coefficient becomes 0.8. The car travels at 44 km/h with the windows and roof closed. For the same amount
Q. Water flows through two different pipes A and B of the same circular cross-section but at different flow rates. The length of pipe A is 1.0 m and that of pipe B is 2.0 m. The flow in both the pipes is laminar and fully developed. If the frictional head loss across the length
Q. A short shoe external drum brake is shown in the figure. The diameter of the brake drum is 500 mm. The dimensions a = 1000 mm, b = 500 mm and c = 200 mm. The coefficient of friction between the drum and the shoe is 0.35. The force applied on the lever F
Q. A uniform disc with radius 𝑟 and a mass of 𝑚 kg is mounted centrally on a horizontal axle of negligible mass and length of 1.5𝑟. The disc spins counter-clockwise about the axle with angular speed 𝜔, when viewed from the right-hand side bearing, Q. The axle precesses about a vertical axis at 𝜔𝑝
Q. The probability that a part manufactured by a company will be defective is 0.05. If 15 such parts are selected randomly and inspected, then the probability that at least two parts will be defective is (round off to two decimal places). Ans: 0.16 – 0.18 Sol: ⇒ Probability of 0 or 1 defective =
Q. Two masses A and B having mass ma and mb, respectively, lying in the plane of the figure shown, are rigidly attached to a shaft which revolves about an axis through O perpendicular to the plane of the figure. The radii of rotation of the masses ma and mb are ra and rb, respectively.
Q. A horizontal cantilever beam of circular cross-section, length 1.0 m and flexural rigidity EI = 200 N·m2 is subjected to an applied moment MA = 1.0 N·m at the free end as shown in the figure. The magnitude of the vertical deflection of the free end is____mm Ans: 2.4 – 2.6 Sol: Given A
