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Level 2 Module 1 Alternating Currents
What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in the secondary? induced high voltage Opening the secondary of a CT under load will cause a dangerous level of___. 40Hz What is the hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second? 340V Given: A circuit has an rms voltage of 120VAC. What is the peak-to-peak voltage? 175V A circuit has a peak voltage of 275V. What is the average voltage value? one-third the applied voltage Each of three equal capacitors in series has___. XL=2piefL The formula for inductive reactance is___.
10A
Given: An AC circuit containing resistance only. What is the current flow if the resistance is 15 ohms and the voltage is 150v? Lags the voltage The current in inductive circuit___. Rms values Unless otherwise noted, the calculations in AC circuits use___. Increases When frequency decreases, capacitive reactance___. It leads the voltage. Which of the following is true of the current in a capacitive circuit? 0.637 x peak value In sine wave terminology, the average value is___. All DC rules and laws apply, including Ohm's law In AC circuits containing only resistance,___.
75V AC
Given: A transformer has 200 turns in the primary, 100 turns in the secondary, and 150V AC applied to the primary. What is the voltage across the secondary? Unlike-wound transformers Transformers in which the primary and secondary voltages are 180 out of phase are known as___. Across the field at 90° Maximum voltage is generated by rotating wire when the conductor is moving___. 10 Hz If the time for one cycle is 0.1 second, the frequency is___. Are in phase If the phase angles of two sine waves are both 0 degrees then the waves___. 400W Calculate the true power in a 2A series RL circuit with a 100 ohms resistor. Frequency increases Inductive reactance increases as the___.
Apparent power The power factor can be defined as the ratio of true power to___. Increasing capacitance For a given frequency, the capacitive reactance decreases with___. By some angle between 0° and 90° In a circuit that has both capacitance and resistance, the current will lead the voltage___. Are 90° out of phase If the vector diagram of two AC waveforms is a right angle, then the waves___. Zero In an inductive AC circuit, when the applied voltage is at its maximum negative value, the current is___. Apparent power The product of the source voltage and the total current is___. The same as the applied voltage In a parallel LC circuit, the voltage across the branches is___.
