In a circuit with ____ power sources, each power source contributes toward the current flow through the resistors.
a. interconnected
b. variable
c. parallel
d. multiple
d. multiple
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When operating the motor ____ speed, the armature voltage is reduced accordingly.
a. at base b. below base c. much above d. above base
? Identify and state the historical significance of George Washington.
What will be an ideal response?
This problem concerns a compound for which the following data is available:
Critical Temperature = 1200 K Critical Pressure = 30 bar Enthalpy of Vaporization at atmospheric pressure = 5000 J/mol. Boiling point at one bar of pressure = 500 K Acentric factor = 0.6 Equation of state for gas/vaporphase: Z = 1 + bP2/T where b = 1 K/bar2 Approximate molar volume of liquid = 200 cm3/mol A) Use the Claussius-Clapeyron Equation to estimate the vapor pressure at T=550 K. B) Use the shortcut equation to estimate the vapor pressure at T=550 K. C) Indicate which of the two estimates generated in questions A and B is more reliable, and EXPLAIN WHY. D) Find a general expression for the fugacity for this compound in the vapor/gas phase, as a function of temperature and pressure. For full credit, the equation should be an algebraic equation (not a differential equation) and should contain only P, T, f and constants. E) Give your best estimates of the liquid phase fugacity and the vapor phase fugacity for this compound, each at T=550 K and P=20 bar.
Calculate the following:
A 500 hp, three-phase, 2200 V, 60 Hz, 12-pole, Y-connected wound-rotor
induction motor has the following parameters:
a. Slip at maximum torque
b. Input current and power factor at maximum torque
c. Maximum torque
d. Resistance that must be added to the rotor windings (per phase) to achieve
maximum torque at starting