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NCCER LEVEL 2 MODULE 1
ALTERNATING CURRENTS
QUESTIONS WITH CORRECT
ANSWERS LATEST UPDATE 2026
What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in the secondary? - correct answer- 2: Opening the secondary of a CT under load will cause a dangerous level of___. - correct answer-induced high voltage What is the hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second? - correct answer-40Hz Given: A circuit has an rms voltage of 120VAC. What is the peak- to-peak voltage? - correct answer-340V A circuit has a peak voltage of 275V. What is the average voltage value? - correct answer-175V
Each of three equal capacitors in series has___. - correct answer- one-third the applied voltage The formula for inductive reactance is___. - correct answer- XL=2piefL Given: An AC circuit containing resistance only. What is the current flow if the resistance is 15 ohms and the voltage is 150v?
- correct answer-10A The current in inductive circuit___. - correct answer-Lags the voltage Unless otherwise noted, the calculations in AC circuits use___. - correct answer-Rms values When frequency decreases, capacitive reactance___. - correct answer-Increases
Which of the following opposes any change in circuit current? - correct answer-Inductance "ELI the ICE MAN" is used to remember___. - correct answer- Phase relationships that exist between voltage and current in an inductive circuit According to the power triangle, the apparent power is___. - correct answer-Greater than the true power Which of the following uses electromagnetic induction to transfer electrical energy from one circuit to another? - correct answer- Transformer 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? - correct answer-75V AC
Transformers in which the primary and secondary voltages are 180 out of phase are known as___. - correct answer-Unlike- wound transformers Maximum voltage is generated by rotating wire when the conductor is moving___. - correct answer-Across the field at 90° If the time for one cycle is 0.1 second, the frequency is___. - correct answer-10 Hz If the phase angles of two sine waves are both 0 degrees then the waves___. - correct answer-Are in phase Calculate the true power in a 2A series RL circuit with a 100 ohms resistor. - correct answer-400W Inductive reactance increases as the___. - correct answer- Frequency increases
In a parallel LC circuit, the voltage across the branches is___. - correct answer-The same as the applied voltage
