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LEVEL 2 MODULE 1 ALTERNATING CURRENTS
GET IT RIGHT QUESTIONS AND ANSWERS
UPDATED EXAM
2:1 - correct answer- 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 - correct answer- Opening the secondary of a CT under load will cause a dangerous level of___. 40Hz - correct answer- What is the hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second? 340V - correct answer- Given: A circuit has an rms voltage of 120VAC. What is the peak-to- peak voltage? 175V - correct answer- A circuit has a peak voltage of 275V. What is the average voltage value?
one-third the applied voltage - correct answer- Each of three equal capacitors in series has___. XL=2piefL - correct answer- The formula for inductive reactance is___. 10A - correct answer- 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 - correct answer- The current in inductive circuit___. Rms values - correct answer- Unless otherwise noted, the calculations in AC circuits use___. Increases - correct answer- When frequency decreases, capacitive reactance___.
45 - correct answer- Given: A 30 - microfarad capacitor in parallel with a 15 - microfarad capacitor. The total capacitance is___. Inductance - correct answer- Which of the following opposes any change in circuit current? Phase relationships that exist between voltage and current in an inductive circuit - correct answer- "ELI the ICE MAN" is used to remember___. Greater than the true power - correct answer- According to the power triangle, the apparent power is___. Transformer - correct answer- Which of the following uses electromagnetic induction to transfer electrical energy from one circuit to another?
75V AC - correct answer- 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 - correct answer- Transformers in which the primary and secondary voltages are 180 out of phase are known as___. Across the field at 90° - correct answer- Maximum voltage is generated by rotating wire when the conductor is moving___. 10 Hz - correct answer- If the time for one cycle is 0.1 second, the frequency is___. Are in phase - correct answer- If the phase angles of two sine waves are both 0 degrees then the waves___.
Zero - correct answer- In an inductive AC circuit, when the applied voltage is at its maximum negative value, the current is___. Apparent power - correct answer- The product of the source voltage and the total current is___. The same as the applied voltage - correct answer- In a parallel LC circuit, the voltage across the branches is___.
