N5D01 What is the name of a current that flows only in one direction?
- A. An alternating current
- B. A direct current
- C. A normal current
- D. A smooth current
N5D04 Which of the following will produce a direct current (DC)?
- A. A NiCd battery
- B. An RF signal generator
- C. A commercial generating station
- D. A crystal calibrator
N5D03 What is the name of a current that flows back and forth, first
in one direction, then in the opposite direction?
- A. An alternating current
- B. A direct current
- C. A rough current
- D. A steady state current
N5D02 Which of the following will produce an alternating current (AC)?
- A. A lead-acid automotive battery
- B. A solar array
- C. A fuel cell
- D. A commercial generating station
N5D05 What term means the number of times per second that an alternating
current flows back and forth?
- A. Pulse rate
- B. Speed
- C. Wavelength
- D. Frequency
N5D06 What is the basic unit of frequency?
- A. The hertz
- B. The watt
- C. The ampere
- D. The ohm
N5D12 What does 60 hertz (Hz) mean?
- A. 6000 cycles per second
- B. 60 cycles per second
- C. 6000 meters per second
- D. 60 meters per second
N5D07 Most humans can hear sounds in what frequency range?
- A. 0 - 20 Hz
- B. 20 - 20,000 Hz
- C. 200 - 200,000 Hz
- D. 10,000 - 30,000 Hz
N5D08 Why do we call electrical signals in the frequency range of 20
Hz to 20,000 Hz audio frequencies?
- A. Because the human ear cannot sense anything in this range
- B. Because the human ear can sense sounds in this range
- C. Because this range is too low for radio energy
- D. Because the human ear can sense radio waves in this range
N5D09 What is the lowest frequency of electrical energy that is usually
known as a radio frequency?
- A. 20 Hz
- B. 2,000 Hz
- C. 20,000 Hz
- D. 1,000,000 Hz
N5D13 What is the name for the distance an AC signal travels during
one complete cycle?
- A. Wave speed
- B. Waveform
- C. Wavelength
- D. Wave spread
N5D14 What happens to a signal's wavelength as its frequency increases?
- A. It gets shorter
- B. It gets longer
- C. It stays the same
- D. It disappears
N5D15 What happens to a signal's frequency as its wavelength gets longer?
- A. It goes down
- B. It goes up
- C. It stays the same
- D. It disappears