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An elementary two-pole, single-phase, synchronous machine, as illustrated in Figure P12.2.1, has a field winding on its rotor and an armature winding on its stator, with Nf = 400 turns and Na = 50 turns, respectively. The uniform air gap is of length 1 mm, while the armature diameter is 0.5 m, and the axial length of the machine is 1.5 m. The field winding carries a current of 1 A (dc) and the rotor is driven at 3600 r/min. Determine:
(a) The frequency of the stator-induced voltage.
(b) The rms-induced voltage in the stator winding.
How does phosphorylated PFK-1 activate and deactivate metabolic pathways? How does this relate to the energy state of the cell? What other molecules regulate PFK-1 activity and how?
Determine the frequency of the rotor voltages of the induction machine.
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If the bore of the machine is 42 cm in diameter, its axial length is 28 cm, and each pole subtends an angle of 60°, determine the air-gap flux density. (Note that the number of parallel paths is equal to the number of poles for lap windings.)
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List in detail all information and data necessary to determine if a proposed tube diameter and gauge number would be satisfactory.
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In the Deacon process for the manufacture of chlorine, HC1 and O2 react to form Cl2 and H20. Sufficient air (21 mole% 02, 79% N2) is fed to provide 35% excess oxygen and the fractional conversion of HCI is 85%.
Also determine the maximum frequency of undistorted output that the op amp will produce at an amplitude of 3 V.
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