Two single phase alternators operate in parallel
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Two single phase alternators operate in parallel and supply a load impedance of
3+j4 ohms. If the impedance of each machine is 0.2+j2 and emfs are 200+j0V and
200+j0V respectively. Determine the terminal voltage.
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- The total instantaneous power absorbed by a three-phase motor (under balanced steady-state conditions) as well as a balanced three-phase impedance load is (a) A constant (b) A function of timeThe instantaneous power absorbed by the load in a single-phase ac circuit, for a general R LC load under sinusoidal-steady-state excitation. is (a) Nonzero constant (b) Zero (c) Containing double-frequency componentsThe total instantaneous power delivered by a three-phase generator under balanced operating conditions is (a) A function of time (b) A constant
- A single-phase source is applied to a two-terminal, passive circuit with equivalent impedance Z=3.045, measured from the terminals. The source current is i(t)=22cos(t)kA. Determine the (a) instantaneous power, (b) real power, (c) reactive power delivered by the source, and (d) source power factor.n 3-phase alternator, the change of terminal voltage from no load to full load is more in case of leading power factor as compared to unity power factor. Select one: True FalseFour identical alternators rated 25 MVA each has a per unit reactance of 0.50. These alternators are supplying power to a common bus bar at 13.8 kV. Solve the 3-phase short circuit MVA at the bus bar.
- Two identical Y‐connected alternators are running in parallel. The generated phase voltages are: E1 = 6.7 kV and E2 = 6.5 kV with E2 leading E1 by 10°. Calculate the voltage across the load per phase and the power factor of the load if the total current is 500A lagging E1 by 37°. The synchronous reactance of each machine is 10 Ω/ phase and resistance is negligible.A single phase, unity power factor load takes 90 Amps at 10 kV. Using a base voltage of 65 kV and base kilovolt amperes of 4475 kVA. Find the base current, base impedance, base power, per unit current and per unit voltage of the load.What is the phase sequence of a three-phase alternator connected in Y for which e VAN = 7200 ∠ - 130 ° V VBN = 7200∠110 ° V? Also, find VCN?
- Two 15-kVA, 400-V, 3-ph alternators in parallel supply a total load of 25 kVA at 0.8p.f. lagging. If one alternator shares half the power at unity p.f., determine thep.f. and kVA shared by the other alternator.In 3 phase 11kVV generator having unity power factor of 100MW load and the sending and receiving end voltage is 11KV and the value of the impedance is j0.242. What isthe value of the reactive power delivered by the capacitor.The effective resistance and synchronous reactance of a 110 kVA, 440 V single phase alternator are 0.2Ω and 0.3Ω respectively. Calculate the full load regulation at (a) Unity power factor (b) 0.8 lagging power factor