A large bypass ratio turbofan engine has the following design and limit parameters:

M0 = 0.8, altitude = 37 kft U. S. standard atmosphere, πd = 0.995, πc = 40, ec = 0.90, α = 6, πf= 1.6, ef = 0.90, πfn= 0.98, fan nozzle is convergent, τλ= 7.0, QR = 42,800 kJ/kg, πb = 0.95, ηb = 0.98, et = 0.90, ηm = 0.975, πn = 0.98, core nozzle is convergent.

Assuming the gas properties may be described by two sets of parameters, namely, cold and hot stream values, i. e.,

Engine cold section: γc = 1 .40, Cpc = 1.004 kJ/kg-K

Engine hot section: γt = 1.33, Cpt = 1.156 kJ/kg-K

Calculate:

the ratio of compressor to fan shaft power Pc/Pf • fuel-to-air ratio, f

a. the ratio of fan nozzle exit velocity to core nozzle exit velocity V19/V9
b. the ratio of two gross thrusts, Fg, fan/Fg, core
c. the engine thermal efficiency and compare it to an ideal Carnot cycle operating between the same temperature limits

When using two-wire cable to feed a 240-v appliance that does not require a neutral wire, you should a. mark both ends of the white wire green. b. use the cable as is. c. use only the black wire. d. mark both ends and any exposed area of the white wire black.

1. consider the case in which air fills air shocks on a truck trailer. the pressure in the shocks is 2 mpa. the temperature is 300 k. the diameter of the shock piston is 10 cm and the initial length of the cylindrical cavity containing the compressed air is 40 cm. a. the truck is gradually loaded over a period of a day in a static setting. the temperature is held constant for the atmosphere and thus for the gas shock. calculate the compressibility of the air in the shock for this condition when the truck is initially being loaded. b. if the shocks were loaded in a dynamic setting by driving over bumps, what would be the compressibility? state your assumption. c. what is the initial load on the shock if the shock is in an atmospheric 100 kpa? d. if the shock is compressed using the process described in part a, and the air shock compressed air cavity length decreases to 20 cm, what is the additional load applied to the shock?

Explain what happens at the saturation point when adding salt to water at room temperature.