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It is required to design the DC motor to run a small size electric vehicle to be used inside an airport building to help the transportation of old people. The vehicle is supposed to carry a maximum of 4 persons at the highest speed of 60 Km/hour. The engine is driven by a 200 V battery capable to energize the motor for 120 Km before being recharged. The efficiency of the motor must be between 85 to 90 percent. The motor shaft diameter is expected to be within (0.2 to 0.4 m). Give the size of the battery required in AH (Ampere Hour). Choose and estimate all the design characteristics of the motor, finally display all the power flow diagram results including efficiency and speed regulation of the motor. Give all assumptions taken.
a system of propane and n-butane exists in two phase vapor liquid equilibrium at 10 bar and 323 k. the mole fraction
the reynolds number of a fluid flowing through a 5-cm-diameter, square-edged orifice plate meter within a 15-cm pipe is 250,000. Find the discharge coefficient for flange taps.
helium at atmospheric pressure and 30 degc flows across a square plate at a free stream velocity of 15 ms. calculate
Consider a system consisting of liquid water initially at T1 = 318 K, p1 = 3.5 bar undergoing a process to a final state at T2 = 353 K, p2 = 1.5 bar. Use appropriate equation with the data from the table to evaluate change in specific entropy.
cylinder containing ch4 c2h6 and n2 has to be prepared in which the ratio of the moles of ch4 to c2h6 is 1.3 to 1.
Consider a cylindrical titanium wire 3.0 mm in diameter and 2.5 x 104 mm long. Calculate its elongation when a load of 500N is applied, assuming that the deformation is totally elastic.
a 2-cm long section of a 3-mm in diameter wire is maintained at a constant surface temperature of 370c. the wire is
a power cycle operates between hot and cold reservoirs at 1000 k and 300 k respectively. for each claimed set of data
An insulated rigid tank contains 5 kg of helium gas at 440 kPa and 31C. A valve is now opened, and helium is allowed to escape until the pressure inside drops to 200 kPa. Assuming the helium remaining inside the tank has undergone a reversible, adiab..
a slender rod is at rest in vertical position with lenght of 1.5m. then a force of 50 n. is applied at the bottom tip.
An auto speedometer is graduated in 5 mph increments and has an accuracy rated to be within ±4%. Estimate the uncertainty in indicated speed at 60 mph.
a viscous fluid flows past a flat plate such that the boundary layer thickness of a distance d from the leading edge is
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