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A 7.5-hp, 250-V, 1800-r/min shunt motor, having a full-load line current of 26 A, is started with a four-point starter. The resistance of the armature circuit, including the inter pole winding, is 0.48 Ω; and the resistance of the shunt-field circuit, including the field rheostat, is 350 Ω. The resistances of the steps in the starting resistor are 2.24, 1.47, 0.95, 0.62, 0.40, and 0.26 Ω, in the order in which they are successively cut out. When the armature current is dropped to its rated value, the starting box is switched to the next point, thus eliminating a step in the starting resistance. Neglecting field-current changes, armature reaction, and armature inductance, find the initial and final values of the armature current and speed corresponding to each step.
The reactor initially contains one mole of ethanol and nothing else. The reaction is run at 550 °C and 2 bar until equilibrium is reached. What is the mole fraction of species at equilibrium?
There are four stable isotopes of iron with mass numbers 54, 56, 57, and 58. There are also two radioactive isotopes: iron-53 and iron- 59. Predict modes of decay for these two isotopes. (See Table 18.2.).
A certain gas has a molecular weight of 30.0 a critical temperature of 310K. and a critical pressure of 4.5MPa. Calculate the density in kg/m3 of this gas at 465 K and 9.0MPa
Test the knowledge and understanding of the concepts and procedures for process instrumentation and communication systems used in process industries.
question 1a discuss in details on five types of health effects related to exposure to hazardous substances encountered
You have two identical containers at a fixed temperature. In one you have water vapor (H2O) and in the other you have carbon dioxide (CO2). In the high-temperature, classical limit for vibrations and rotations, meaning that (rotation angle
Machining of composites can be classified as conventional machining and non-traditional machining. Among each category, there are many processes. Describe each of those processes, by giving the brief definition of the process, listing the machine..
What is the required flow rate of cooling water to the exchanger between the wasteheat boiler and the absorber and how much heat must be removed by the two heat exchangers cooling the recycled absorber liquid? Why is there a need to remove this heat?
Derive the following equation for the optimum outside diameter of insulation on a wire for maximum heat loss:
How many of the following ground state electron configurations are allowed? 1s22s22p7 1s22s22p62d1
Why does the dielectric constant of water drop as a function of temperature?
A three-phase, wye-connected, cylindrical-rotor, synchronous motor, with negligible armature resistance and a synchronous reactance of 1.27 Ω per phase, is connected in parallel with a three phase, wye-connected load taking 50 A at 0.707 lagging p..
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