Canadian Basic Qualification pool, section B-007-005

Subelement B-007

B-007

Section B-007-005

B-007-005-001

How do sunspots change the ionization of the atmosphere?

A.
The more sunspots there are, the lesser the ionization
B.
They have no effect
Correct Answer
C.
The more sunspots there are, the greater the ionization
D.
Unless there are sunspots, the ionization is zero

B-007-005-001

The number of sunspots visible on the surface of the Sun is related to overall solar activity. The higher the sunspot numbers, the higher the emission of Ultraviolet (UV) and particles. Ionization is directly influenced by the level of radiation.

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

Tags: none

B-007-005-002

How long is an average sunspot cycle?

A.
5 years
Correct Answer
B.
11 years
C.
17 years
D.
7 years

B-007-005-002

Key word: AVERAGE. The duration of the solar cycles varies from 7 to 17 years but the AVERAGE is 11 YEARS.

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

Tags: none

B-007-005-003

What is solar flux?

A.
The number of sunspots on the side of the sun facing the Earth
B.
The density of the sun's magnetic field
Correct Answer
C.
The radio frequency energy emitted by the sun
D.
A measure of the tilt of the Earth's ionosphere on the side toward the sun

B-007-005-003

The Sun's activity can be observed by visually counting sunspots but also by measuring noise at a microwave frequency. Sunspot numbers and solar flux are well co-related. The measurement of the solar flux is reported as a Solar Flux Index.

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

Tags: none

B-007-005-004

What is the solar-flux index?

A.
A measure of solar activity that is taken annually
B.
Another name for the smoothed sunspot number (SSN)
Correct Answer
C.
A measure of solar activity that is taken at a specific frequency
D.
A measure of solar activity that compares daily readings with results from the last six months

B-007-005-004

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

Tags: none

B-007-005-005

What influences all radiocommunication beyond ground wave or line-of-sight ranges?

Correct Answer
A.
Solar radiation
B.
The F1 region of the ionosphere
C.
Lunar tidal effects
D.
The F2 region of the ionosphere

B-007-005-005

Because the Sun affects the ionosphere and the troposphere (e.g., temperature inversions), it can be said that it has an influence on all radiocommunications.

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

Tags: none

B-007-005-006

What effect of the sun's activity influences ionospheric propagation on a daily basis?

Correct Answer
A.
Electromagnetic and particle radiation
B.
Infrared radiation
C.
Solar wind
D.
Coronal mass ejections (CME)

B-007-005-006

Ultraviolet (UV) rays, a form of electromagnetic radiation, and particles [namely alpha and beta] are responsible for ionization in the ionosphere.

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

Tags: none

B-007-005-007

When sunspot numbers are high, how is propagation affected?

A.
High frequency radio signals become weak and distorted
B.
High frequency radio signals are absorbed
Correct Answer
C.
Frequencies up to 40 MHz or even higher become usable for long-distance communication
D.
Frequencies up to 100 MHz or higher are normally usable for long-distance communication

B-007-005-007

Maximum Usable Frequencies (MUF) in the range of 30 to 50 MHz become possible during solar cycle peaks. Stronger ionization allows upper regions of the ionosphere to refract higher frequencies rather than let them escape into space (as is the case during solar cycle lows).

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

Tags: none

B-007-005-008

All communication frequencies throughout the spectrum are affected in varying degrees by:

Correct Answer
A.
the sun
B.
the ionosphere
C.
auroras
D.
meteor showers

B-007-005-008

Because the Sun affects the ionosphere and the troposphere (e.g., temperature inversions), it can be said that it has an influence on all radiocommunications.

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

Tags: none

B-007-005-009

Average duration of a solar cycle is:

A.
6 years
B.
1 year
C.
3 years
Correct Answer
D.
11 years

B-007-005-009

Key word: AVERAGE. The duration of the solar cycles varies from 7 to 17 years but the AVERAGE is 11 YEARS.

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

Tags: none

B-007-005-010

The ability of the ionosphere to refract high frequency radio signals depends on:

A.
the receiver sensitivity
Correct Answer
B.
the amount of solar radiation
C.
the power of the transmitted signal
D.
upper atmosphere weather conditions

B-007-005-010

Ionization makes refraction possible. Ultraviolet (UV) rays, a form of electromagnetic radiation, and particles [namely alpha and beta] are responsible for ionization in the ionosphere.

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

Tags: none

B-007-005-011

What is the major cause of cyclical changes in HF propagation?

A.
Magnetic pole drift cycle
B.
Jet stream cycle
C.
Auroral cycle
Correct Answer
D.
Solar cycle

B-007-005-011

Apart from daily variations in solar radiation, HF propagation is impacted by the solar cycles. The duration of the solar cycles varies from 7 to 17 years but the AVERAGE is 11 YEARS.

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

Tags: none

Log in

- or -

- or -