Chapter 3: Q32 MCQ (page 87)
For the same output, the autotransformer (with not too large a turns ratio) is smaller in size than a two-winding transformer and has high efficiency as well as superior voltage regulation.
(a) True
(b) False
Therefore, the correct answer is (a) True
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Consider a single-phase electric system shown in Figure 3.33. Transformers are rated as follows:
XโY, , leakage reactance
YโZ,, leakage reactance
With the base in circuit Y chosen as,, determine the per unit impedance of theresistive load in circuit Z, referred to circuits
Z, Y, and X. Neglecting magnetizing currents, transformer resistances, and line impedances, draw the impedance diagram in per unit.
For the power system in Problem 3.41, the synchronous motor absorbs at 0.8 power factor leading with the bus 3 voltage at.Determine the bus 1 and bus 2 voltages in. Assume that generators 1and 2 deliver equal real powers and equal reactive powers. Also assume abalanced three-phase system with positive-sequence sources.
A low value of transformer leakage reactance is desired to minimize the voltage drop, but a high value is desired to limit the fault current, thereby leading to a compromise in the design specification.
(a) True
(b) False
For an ideal 2-winding transformer, an impedanceconnected acrosswinding 2 (secondary) is referred to winding 1 (primary) by multiplying by
(a) The turns ratio
(b) The square of the turnโs ratiorole="math" localid="1655113801735"
(c) The cubed turnโs ratio
Using the transformer ratings as base quantities, work Problem 3.14 in per-unit.
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