NCCER Electrical 2 Module1

If the time for one cycle is 0.2 seconds, the frequency is __.

• 0.2Hz

• 2Hz

• 5Hz

• 10Hz

What is the frequency of an AC waveform that completes 30 cycles per half second?

• 30Hz

• 40Hz

• 50Hz

• 60Hz

If the phase angles of two sine waves are both 0 degrees, then the waves __.

• have the same amplitude

• are 90 degrees out of phase

• have the same peak voltage

• are in phase

A circuit has a peak voltage of 310V. What is the average voltage value?

• 120V

• 197V

• 220V

• 277V

What is the current flow in a purely resistive AC circuit if the resistance is 20 ohms and the voltage is 240V?

• 12A

• 14A

• 18A

• 22A

One type of non-sinusoidal waveform is the

• Peak wave

• Sine wave

• Phase angle wave

• Sawtooth wave

The opposing force that an inductor presents to the flow of alternating current is called __.

• Inductive resistance

• Inductive reactance

• True resistance

• Inductive capacitance

The self-induced voltage across an inductance 1s produced by a change in current with respect to __.

• Frequency

• Time

• Capacitance

• Input Voltage

A 20-microfarad capacitor is in parallel with a 10-microfarad capacitor. The total capacitance is __.

• 10 microfarads

• 20 microfarads

• 30 microfarads

• 40 microfarads

Each of two equal capacitors in series has __.

• Half the applied voltage

• The original value of applied voltage

• Twice the applied voltage

• four times the applied voltage