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A dc shunt machine has an armature winding resistance of 0.12 Ω and a shunt-field winding resistance of 50 Ω. The machine may be run on 250-V mains as either a generator or a motor. Find the ratio of the speed of the generator to the speed of the motor when the total line current is 80 A in both cases.
If the capital costs in the adipic acid example described in Example 9.5 are known to within -10% to +30%, and the cash flow from operations is predicted within ±10%, estimate the mean and standard deviation of the 10-year NPV. Is there a greater ..
The production rate obtained in the fourth year is then held constant until the value of the property is paid off. What would have been the annual depreciation cost if the straight-line method based on time had been used?
Assuming that the maximum-speed condition determines the machine size, and neglecting exciting current, losses, and voltage drops in the induction machine,
A flow process produces work using water as the working medium. The process is as follows: steam of quality 50% at 1 bar is compressed adiabatically to 20 bar; is heated isothermally by absorbing 3500 kJ/kg of heat; is expanded adiabatically to an..
The gas upstream from the point of ammonia injection contains no measurable ammonia. How many kilograms of natural gas are flowing through the pipelines per hour?
A plating waste with a flow of 50 L/min contains 274 mg/L of NaCN. Determine the amounts of chlorine as Ca(OCl)2 and NaOH required to: (a) Oxidize the cyanide to cyanide; and (b) Oxidize the cyanide to CO2 and H2O.
If the generated emfs are 200 and 210 V, respectively, determine the load voltage and the armature current of each machine.
Calculate the resistance of the armature circuit and the field circuit.
A vapor rate of 2500 kg/h is required and the vaporizer will operate at 6 bara. Size the vessel to restrict the carryover of liquid droplets. The liquid hold-up time need not be considered, as the liquid level will be a function of the thermal des..
Experimental tests have been carried out on this equipment, and the results for the slurry mixture used can be expressed as follows for any one pressure drop:
If a delta-connected capacitor bank, with a per-phase reactance of 60 Ω, is connected in parallel with the load at its terminals, compute the resulting line-to-line voltage at the load terminals.
If the stress at the center is 12,000 psi, what is the strain? Also, calculate the unit volume change e and the strain-energy density u at the center.
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