Canadian Basic Qualification pool, section B-005-007

Subelement B-005

B-005

Section B-005-007

B-005-007-001

What is the term for the number of times per second an alternating current completes a positive to negative cycle?

Correct Answer
A.
Frequency
B.
Speed
C.
Pulse rate
D.
Phase

B-005-007-001

Frequency is the number of cycles per second of an Alternating Current (AC). Frequency is expressed in hertz (Hz). One hertz is one cycle per second.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-007-002

What approximate range of frequencies can most humans hear?

Correct Answer
A.
20 Hz to 20 000 Hz
B.
300 Hz to 3 000 Hz
C.
20 Hz to 30 000 Hz
D.
200 Hz to 200 000 Hz

B-005-007-002

Hz = hertz = cycles per second. Frequencies audible to humans range from 20 Hz to 20 000 Hz. Speech frequencies important for intelligibility in communications range from 300 Hz to 3000 Hz.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-007-003

Why is the range of frequencies from 20 Hz to 20 kHz termed audio frequencies?

A.
Because sound can be in this range but it's too low for RF signals
B.
Because RF signals in this range can be directly converted to sound
C.
Because this is the speaker response range of a modern SSB receiver
Correct Answer
D.
Because the human ear can sense sound in this range

B-005-007-003

Hz = hertz = cycles per second. Frequencies audible to humans range from 20 Hz to 20 000 Hz. Speech frequencies important for intelligibility in communications range from 300 Hz to 3000 Hz.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-007-004

Electrical energy at a frequency of 7125 kHz is in what frequency range?

A.
Very High Frequency (VHF)
B.
Low Frequency (LF)
Correct Answer
C.
High Frequency (HF)
D.
Medium frequency (MF)

B-005-007-004

Frequencies audible to humans range from 20 Hz to 20 000 Hz (AUDIO). Speech frequencies important for intelligibility in communications range from 300 Hz to 3000 Hz. Radio frequencies can reach up to 300 GHz ( 300 000 MHz ): Medium Frequencies 300 kHz to 3000 kHz, High Frequencies 3 MHz to 30 MHz, Very High Frequencies 30 MHz to 300 MHz, Ultra High Frequencies 300 MHz to 3000 MHz, Super High Frequencies 3 GHz to 30 GHz, Extremely High Frequencies 30 GHz to 300 GHz.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-007-005

What is the name for the distance an AC signal travels during one complete cycle?

A.
Wave speed
B.
Wave spread
C.
Waveform
Correct Answer
D.
Wavelength

B-005-007-005

Wavelength: the distance between successive points of equal amplitude and phase on a wave (for example, crest to crest or trough to trough).

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-007-006

What happens to a signal's wavelength as its frequency increases?

Correct Answer
A.
It decreases
B.
It decreases proportionally to frequency squared
C.
It increases proportionally to frequency squared
D.
It increases

B-005-007-006

Wavelength (lambda) in metres is 300 divided by frequency in megahertz ( i.e., the speed of light divided by the frequency in hertz ). Wavelength and frequency have an inverse relationship.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-007-007

What happens to a signal's frequency as its wavelength gets shorter?

A.
It increases proportionally to frequency squared
Correct Answer
B.
It increases
C.
It decreases proportionally to frequency squared
D.
It decreases

B-005-007-007

Wavelength (lambda) in metres is 300 divided by frequency in megahertz ( i.e., the speed of light divided by the frequency in hertz ). Wavelength and frequency have an inverse relationship.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-007-008

What does 60 hertz (Hz) mean?

A.
60 metres per second
Correct Answer
B.
60 cycles per second
C.
6000 cycles per second
D.
6000 metres per second

B-005-007-008

Hz = hertz = cycles per second. Frequency is the number of cycles per second of an Alternating Current (AC). Frequency is expressed in hertz (Hz). One hertz is one cycle per second.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

B-005-007-009

Two AC waveforms have the same frequency, but their cycles do not begin at the same instant. What term describes that timing difference?

A.
Delta
B.
Offset
Correct Answer
C.
Phase
D.
Polarity

B-005-007-009

Periodic signals, such as sine waves, of identical frequency that do not align time-wise are said to be "out of phase". A phase shift exists between them.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-007-010

What is the shape of the waveform of the electricity supplied from a household receptacle?

A.
Complex wave
B.
Modified square wave
C.
Pulse wave
Correct Answer
D.
Sine wave (sinusoidal)

B-005-007-010

The voltage, typically generated by alternators, follows a repeating (periodic) sinusoidal curve.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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B-005-007-011

A signal is composed of a fundamental frequency of 2 kHz and another of 4 kHz. What name is given to the 4 kHz signal?

Correct Answer
A.
Harmonic
B.
Alias
C.
Intermodulation
D.
Sub-harmonic

B-005-007-011

'Harmonics' are integer MULTIPLES (e.g., 2x, 3x, 4x, 5x,...) of a given frequency. The base frequency is referred to as the 'fundamental'.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

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