Level 2 Module 1 Alternating Currents
0.637 x peak value - Correct Answer In sine wave terminology, the average value is___.
10 Hz - Correct Answer If the time for one cycle is 0.1 second, the frequency 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?
175V - Correct Answer A circuit has a peak voltage of 275V. What is the average voltage value?
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?
340V - Correct Answer Given: A circuit has an rms voltage of 120VAC. What is the peak-to-peak voltage?
400W - Correct Answer Calculate the true power in a 2A series RL circuit with a 100 ohms resistor.
40Hz - Correct Answer What is the hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second?
45 - Correct Answer Given: A 30-microfarad capacitor in parallel with a 15-microfarad capacitor. The total
capacitance is___.
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?
Across the field at 90° - Correct Answer Maximum voltage is generated by rotating wire when the conductor is
moving___.
All DC rules and laws apply, including Ohm's law - Correct Answer In AC circuits containing only resistance,___.
Apparent power - Correct Answer The power factor can be defined as the ratio of true power to___.
Apparent power - Correct Answer The product of the source voltage and the total current is___.
Are 90° out of phase - Correct Answer If the vector diagram of two AC waveforms is a right angle, then the
waves___.
Are in phase - Correct Answer If the phase angles of two sine waves are both 0 degrees then the waves___.
By some angle between 0° and 90° - Correct Answer In a circuit that has both capacitance and resistance, the
current will lead the voltage___.
Current with respect to time - Correct Answer The self-induced voltage across in inductance is equal to the change
in___.
Frequency increases - Correct Answer Inductive reactance increases as the___.
Greater than the true power - Correct Answer According to the power triangle, the apparent power is___.
Increases - Correct Answer If the area of the plates of a capacitor is increased, the amount of capacitance___.
Increases - Correct Answer When frequency decreases, capacitive reactance___.
Increasing capacitance - Correct Answer For a given frequency, the capacitive reactance decreases with___.
induced high voltage - Correct Answer Opening the secondary of a CT under load will cause a dangerous level of___.
Inductance - Correct Answer Which of the following opposes any change in circuit current?
It leads the voltage. - Correct Answer Which of the following is true of the current in a capacitive circuit?
Lags the voltage - Correct Answer The current in inductive circuit___.
0.637 x peak value - Correct Answer In sine wave terminology, the average value is___.
10 Hz - Correct Answer If the time for one cycle is 0.1 second, the frequency 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?
175V - Correct Answer A circuit has a peak voltage of 275V. What is the average voltage value?
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?
340V - Correct Answer Given: A circuit has an rms voltage of 120VAC. What is the peak-to-peak voltage?
400W - Correct Answer Calculate the true power in a 2A series RL circuit with a 100 ohms resistor.
40Hz - Correct Answer What is the hertz rating of an AC circuit if the frequency is 20 cycles per 1/2 second?
45 - Correct Answer Given: A 30-microfarad capacitor in parallel with a 15-microfarad capacitor. The total
capacitance is___.
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?
Across the field at 90° - Correct Answer Maximum voltage is generated by rotating wire when the conductor is
moving___.
All DC rules and laws apply, including Ohm's law - Correct Answer In AC circuits containing only resistance,___.
Apparent power - Correct Answer The power factor can be defined as the ratio of true power to___.
Apparent power - Correct Answer The product of the source voltage and the total current is___.
Are 90° out of phase - Correct Answer If the vector diagram of two AC waveforms is a right angle, then the
waves___.
Are in phase - Correct Answer If the phase angles of two sine waves are both 0 degrees then the waves___.
By some angle between 0° and 90° - Correct Answer In a circuit that has both capacitance and resistance, the
current will lead the voltage___.
Current with respect to time - Correct Answer The self-induced voltage across in inductance is equal to the change
in___.
Frequency increases - Correct Answer Inductive reactance increases as the___.
Greater than the true power - Correct Answer According to the power triangle, the apparent power is___.
Increases - Correct Answer If the area of the plates of a capacitor is increased, the amount of capacitance___.
Increases - Correct Answer When frequency decreases, capacitive reactance___.
Increasing capacitance - Correct Answer For a given frequency, the capacitive reactance decreases with___.
induced high voltage - Correct Answer Opening the secondary of a CT under load will cause a dangerous level of___.
Inductance - Correct Answer Which of the following opposes any change in circuit current?
It leads the voltage. - Correct Answer Which of the following is true of the current in a capacitive circuit?
Lags the voltage - Correct Answer The current in inductive circuit___.
