Chapter 2: 31MCQ (page 72)
One advantage of balanced three-phase system over separate single- phase system is reduced capital and operating costs of transmission and distribution.
(a) True
(b) False
Answer
Therefore the correct option is (a): True
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A balanced delta connected impedance load with per phase is supplied by a balanced three-phase , source. (a) Calculate the line current, the total real and reactive power absorbed the load, the load power factor, and the apparent power. (b) Sketch a phasor diagram showing the line currents, the line-to-line source voltages, and the -load currents. Use as the reference.
For the circuit shown in Figure 2.29, (a) determine the 2 X 2 bus admittance matrix (b) convert the voltage sources to current sources and determine the vector of source currents into buses 1 and 2.
When working with balanced three-phase circuits, per-phase analysis is commonly done after convertingloads to Y loads, thereby solving only one phase of the circuit.
(a) True
(b) False
The average power in a single-phase ac circuit with a purely capacitive load, for sinusoidal-steady-state excitation, is
(a) Zero
(b)
(c)
[Note: is the capacitive reactance]
With load convention, where the current enters the positive terminal of the circuit element, if is positive then positive reactive power is absorbed.
(a) True
(b) False
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