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1. The terms “open-circuit", “short circuit" and “dead short" are used in speaking electricity. Answer the following questions about these three terms: a. What is the value of the resistance of an open circuit? b. What is the value of the resistance of a short circuit? c. What is meant by a “dead short"? 5 DDPasalo-Electrical Engineering Department COE MMSU EE 121: Electrical Circuits I 2. When a switch is open, is the resistance between its terminals high or low? ¸Low 3. What is the resistance of a closed switch (ideally)? 4. Using each of the methods shown in (a) and (b) below, calculate the value of the equivalent resistance of a combination of R1 = 5 ohms and R2 = 20 ohms connected in parallel a. Using the equation: 1/Requivalent = 1/R, + 1/R2 + 1/R3 = b. Using the equation: Requivalent = (R, x R2) / (R, + R2) = Ω

1. The power transformer that used to steps the voltage down from transmission levels to distribution levels is called: A) Substation transformer C) Distribution transformer B) Unit transformer D) Potential transformer. 2. The primary and secondary windings of an ideal transformer have power factor. A) Higher. B) Much lower. D) Lower. C) Same. 3. Volt-amperes reactive (VAR) is the unit that used to measure the A) Active power. B) Reactive power. C) Real power. D) Apparent power. 4. The portion of the flux that goes through one of the transformer coils but not the other one is called. A) Average flux B) Mutual flux C) Total flux D) Leakage flux 5. The fundamental component of the magnetization current the voltage applied to the core by 90°: A) Lags, 45°. B) Leads, 45°. C) Lags, 90°. D). Leads, 90°. 6. The ---- are resistive heating losses in the core of the transformer. A) Hysteresis losses. B) Copper losses. C) Leakage flux losses. D) Eddy current losses. 7. The total rotational losses…