Download NCCER Level 2 Module 1 Alternating Currents (Latest 2026 / 2027 Update) Questions and Answ and more Exams Nursing in PDF only on Docsity!
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NCCER Level 2 Module 1 Alternating Currents
Questions and Answers
1.What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in the secondary? ANS 2: 2.Opening the secondary of a CT under load will cause a dangerous level of. ANS induced high voltage 3.What is the hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second? ANS 40Hz 4.Given A circuit has an rms voltage of 120VAC. What is the peak-to-peak voltage? ANS 340V 5.A circuit has a peak voltage of 275V. What is the average voltage value? ANS - 175V
2 / 6.Each of three equal capacitors in series has. ANS one-third the applied voltage 7.The formula for inductive reactance is. ANS XL=2piefL 8.Given An AC circuit containing resistance only. What is the current flow if the resistance is 15 ohms and the voltage is 150v? ANS 10A 9.The current in inductive circuit. ANS Lags the voltage 10.Unless otherwise noted, the calculations in AC circuits use. ANS Rms val- ues 11.When frequency decreases, capacitive reactance. ANS Increases 12.Which of the following is true of the current in a capacitive circuit? ANS It leads the voltage. 13.In sine wave terminology, the average value is.
4 / 20.According to the power triangle, the apparent power is. ANS Greater than the true power 21.Which of the following uses electromagnetic induction to transfer electri- cal energy from one circuit to another? ANS Transformer 22.Given A transformer has 200 turns in the primary, 100 turns in the sec- ondary, and 150V AC applied to the primary. What is the voltage across the secondary? ANS 75V AC 23.Transformers in which the primary and secondary voltages are 180 out of phase are known as. ANS Unlike-wound transformers 24.Maximum voltage is generated by rotating wire when the conductor is moving. ANS Across the field at 90° 25.If the time for one cycle is 0.1 second, the frequency is. ANS 10 Hz
5 / 26.If the phase angles of two sine waves are both 0 degrees then the waves. ANS Are in phase 27.Calculate the true power in a 2A series RL circuit with a 100 ohms resis- tor. ANS 400W 28.Inductive reactance increases as the. ANS Frequency increases 29.The power factor can be defined as the ratio of true power to. ANS Apparent power 30.For a given frequency, the capacitive reactance decreases with. ANS In- creasing capacitance 31.In a circuit that has both capacitance and resistance, the current will lead the voltage. ANS By some angle between 0° and 90° 32.If the vector diagram of two AC waveforms is a right angle, then the waves. ANS Are 90° out of phase
