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Question

h.h-h th. .ai...-t- Ah6 hmth" V nrAYtramli.merundernepative w traaharimer at a eluced bilooltampere Such an operation is called open dela. re J18 In per unit calulatioms of theve-ghase cieuits, we reqsuire the base voltages on the two sids to have the same ratio as the rated Section 3.6 eandorner mut have sme kilocehampere ings CTrue or False) 3.20 List two applications of the tertiary winding of a three winding transformer 3.21 What are the typical connections of the three-winding transformers connected for three phase applications Section 3.7 3.22 Referring Figure 17(", the American standard for designating terminals ,, and x, on requires that the positive- sequence voltage drop from H to neutral peositive- sequence voltage drop from X, to neutral by 30; regardless of whether Y-A lead the or the winding is on the high-voltage side. (True or False) 3.23 when stepping up from the low-voltage to the high-voltageside of a -Yora trans. former, retand negative-sequence voltages and currents by 30. (True or False) Section 3.8 3.24 Regulating transformer is a type of transformer designed for small adjustments of voltage 3.25 Most transformers provide taps on windings to adjust the ratio of transformation by 3.26 When two paralleled transformers of equal kilovoltamperes do not share the kilovoltam rather than large changes in voltage levels. (True or False) changing taps when the transformer is de-energized. A change in tap cannot be made while the transformer is energized. (True or False) peres equally because their impedances differ, the kilovoltamperes may be more nearly equalized by adjustment of the voltage-magnitude ratios through tap changing, (True or False) 3.27 The phase-shifting transformer is useful to control the amount of reactive power flow but has less fect on real power flow (True or Falise) Section 3.9 3.28 The winding on the rotor of a synchronous machine, called the field winding, is supplied 3.29 If the synchronous machine is a generator, the shaft is driven by a prime mover, which is 3.30 What is the difference between the electrical frequency and the mechanical frequency 3.31 In a synchronous generator, what is the relationship between synchronous frequency with de current. (True or False usualy ascam or hydraulic turbine. True or False) when describing a synchronous machine? number of poles, and the rotation speed of the rotor?

Explanation / Answer

According to chegg policy, ihave to answer only 1st question

3.16) The magnitude of phase shift is 30 degree i.e option (D). This is for both voltage and current , only direction changes i.e. either +30 or -30

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