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An electric motor under steady load draws 9.7 amperes at 110 volts; it delivers 0.93 Kw of mechanical energy. The temperature of the surroundings is 300 K. What is the total rate of entropy generation in W K-1?
A reservoir contains natural gas at a pressure of 5000 psig and a temperature of 180 °F. The composition of the gas is 80% methane, 15% ethane, and 5% CO2 (all fractions are by mole).
A 50-kW, 250-V, short-shunt compound generator has the following data: Ra = 0.06 Ω, RS = 0.04 Ω, and Rf = 125 Ω. Calculate the induced armature voltage at rated load and terminal voltage. Take 2 V as the total brush-contact drop.
1 when a thermocouple is moved from one medium to another medium at a different temperature the thermocouple must be
In a device to produce potable water, humid air at 90°F, 29.7 in Hg, and 95% relative humidity iscooled to 40°F at constant pressure. What volumetric flow rate of air into the cooler (ft3/min) isrequired to provide 10.0 gal/min of condensed water?
Steam at 2100 kPa and 533.15 K (260°C) expands at constant enthalpy (as in a throttling process) to 125 kPa. What is the temperature of the steam in its final state and what is its entropy change? What would be the final temperature and entropy ch..
A mixture of benzene and toluene containing 60 mole percent benzene is to be separated into an overhead product containing 96 mole percent benzene and a bottoms containing 25 mole percent benzene.
The synchronous speed of a wound-rotor induction motor is 900 r/min. Under a blocked-rotor condition, the input power to the motor is 45 kW at 193.6 A.
Will radiocarbon dating work well for small samples of 10 mg or less? (For14C, half life = 5730 years.)
Develop the four equations and describe the meaning of each term.
A recovery of 95% of particles greater than 100 μm is required. The minimum operating temperature will be 10 °C and the maximum 30 °C. Design a hydro cyclone system to handle 1200 liters/min of this slurry.
The lower flammable limit (LFL) of methanol in air is 6.0 mole%. Calculate the temperature at which the equilibrium percentage of methanol vapor in a saturated methanol-air mixture would equal the LFL. (This temperature is a rough estimate of the ..
Let the subset of those components given which have strictly positive initial concentrations. Give an algorithm to generate the set of components which are strictly positive for all subsequent (positive) times.
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