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Which of the following is the most important advantage of AC power over DC power? A. Easy to change the values of I and E B. Easy to Generate C. Saves weight D. None of the Above -Answer- Easy to change the values of I and E __________ is created by the AC generator. A. rectifier B. sine wave C. peak-to-peak RMS D. direct current -Answer- Sine Wave One half of a sine wave is called a ____________. A. RMS wave B. Period C. Alternation D. Cycle -Answer- Alternation The measured value from the maximum positive to the maximum negative values of voltage or current is called __________ values. A. RMS B. Peak-to-Peak C. Period D. Alternation E. Cycle -Answer- Peak-to-Peak AC Voltmeters measure in ________ values. A. RMS B. Peak-to-Peak C. Average D. Alternation Squared -Answer- RMS ___________ is the angular relationship between the peak values of I and E. A. Phase B. Peak-to-Peak C. Average Cos. angle D. Alternation Squared Phase -Answer- Phase RMS values = _________ of the peak value. A. Right Most angle Squared B. .707 C. Average Cos. angle D. .632 -Answer- .707 If a circuit has a peak voltage of 310.2 vac, what is the RMS voltage? A. 219 watts B. 189 watts C. 310 volts D. 195 volts -Answer- 219 watts (310x.707=219) If an AC generator has 8 poles and the rotor turns at 1,800 RPM, what is the frequency of AC produced in Hz.? A. 219 B. 120 C. 310 D. 189 -Answer- 120 (8/2x1800/60=120) The useful Power generated in an AC circuit is called __________ Power. A. True B. Apparent C. Factor D. Cos. -Answer- True True power is that produced by I and E which is _________ phase. A. In B. Out C. None of the above -Answer- In The amount of I and E which are in phase is also called the: A. True Power B. Apparent Power C. Power Factor D. Cos. Factor -Answer- True Power If the peak voltage is 110 vac, and the peak current is 13 amps, what is the Apparent Power? (in volt-amps) A. 1,430 va B. 430 va C. 51 va D. none of the above -Answer- None of the Above ((110x.707)x(13x.707)) If the RMS voltage is 220 vac, the RMS current is 3.5 amps, and the Phase Angle 54 degrees, what is the True Power (in watts to two decimal places)? A. 900.73 B. 866.83 C. 199.28 D. 317.68 E. 452.59 -Answer- 452.59 What is the Phase Angle if the Power Factor is .9945? A. 6 degrees B. 12 degrees C. 0 degrees D. 3.56 degrees -Answer- 6 degrees The working voltage of a capacitor in an ac circuit should be: A. .707 times the applied voltage B. at least 50 % greater than the highest applied voltage C. equal to the highest applied voltage -Answer- equal to the highest applied voltage The term that describes the combined resistive forces in an ac current is: A. resistance B. total resistance C. impedance -Answer- impedance The basis for transformer operation in the use of alternating current is mutual ________. A. inductance B. capacitance C. reactance -Answer- inductance The opposition offered by a coil to the flow of alternating current is called (disregard resistance): A. impedance B. reluctance C. inductive reactance -Answer- inductive reactance An increase in which of the following factors will cause an increase in the inductive reactance of a circuit? A. Inductance and frequency B. Resistance and voltage C. Resistance and capacitive reactance. -Answer- Inductance and frequency When different rated capacitors are connected in series in a circuit, the total capacitance is? a. Less than the capacitance of the lowest rated capacitor b. Greater than the capacitance of the highest rated capacitor c. Equal to the sum of all the capacitance -Answer- a. Less than the capacitance of the lowest rated capacitor The amount of electricity a capacitor can store is directly proportional to the: a. distance between the plates and in proportion to the plate area b. the plate area and are not effected by the distance between the plates c. Plate and are inversely proportional to the distance between the plates -Answer- c. Plate are and inversely proportional to the distance between the plates
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