A single-phase 100-kVA, 14/2.4-kV transformer connected to a source through a line impedance of 38.2 + j140 as shown in Figure 1. The transformer's equivalent series impedance referred to the secondary is 0.10+ j0.40 2. The load is 90 kW at 0.8 lagging power factor and 2300 V. V source Source 38.2 Ω j140 Ω www Feeder (transmission line) 010 Ω j040 Ω www Transformer Figure 1: Circuit for Problem 1 a) Find the voltage of the source. b) Find the voltage regulation of the transformer for this load. c) Find the efficiency of the transformer ignoring the core losses. Load Load 90 kW 0.80 PF

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A. The brushes used in a DC generator a) ride against the commutator segments. b) are made from material softer than the commutator segments. c) are generally marked Al and A2 d) all of the above B. A magneto is a DC generator that uses for its pole pieces. a) electromagnets b) permanent magnets c) either "a" or "b" d) neither "a" nor "b"

A recording studio put in an isolation transformer to keep hums and buzzes down in the recorded audio. What's the turns ratio in this transformer? A. 21 B. Can be any ratio C.11 D. 12