Canadian Basic pool, section 5-08

Basic

This is an old (expired) question pool. Click here to go to the current version

Subelement 5

Basic Electronics and Theory

Section 5-08

ratios, logarithms, decibels

5-08-01

A two-times increase in power results in a change of how many dB?

A.
6 dB higher
Correct Answer
B.
3 dB higher
C.
12 dB higher
D.
1 dB higher

5-08-01

This question does not yet have an explanation! Register to add one

Tags: none

5-08-02

How can you decrease your transmitter's power by 3 dB?

A.
Divide the original power by 1.5
B.
Divide the original power by 3
C.
Divide the original power by 4
Correct Answer
D.
Divide the original power by 2

5-08-02

This question does not yet have an explanation! Register to add one

Tags: none

5-08-03

How can you increase your transmitter's power by 6 dB?

A.
Multiply the original power by 3
B.
Multiply the original power by 2
Correct Answer
C.
Multiply the original power by 4
D.
Multiply the original power by 1.5

5-08-03

This question does not yet have an explanation! Register to add one

Tags: none

5-08-04

If a signal-strength report is "10 dB over S9", what should the report be if the transmitter power is reduced from 1500 watts to 150 watts?

A.
S9 plus 3 dB
B.
S9 minus 10 dB
C.
S9 plus 5 dB
Correct Answer
D.
S9

5-08-04

This question does not yet have an explanation! Register to add one

Tags: none

5-08-05

If a signal-strength report is "20 dB over S9", what should the report be if the transmitter power is reduced from 1500 watts to 150 watts?

Correct Answer
A.
S9 plus 10 dB
B.
S9 plus 5 dB
C.
S9 plus 3 dB
D.
S9

5-08-05

This question does not yet have an explanation! Register to add one

Tags: none

5-08-06

The unit "decibel" is used to indicate:

A.
an oscilloscope wave form
Correct Answer
B.
a mathematical ratio
C.
certain radio waves
D.
a single side band signal

5-08-06

This question does not yet have an explanation! Register to add one

Tags: none

5-08-07

The power output from a transmitter increases from 1 watt to 2 watts. This is a db increase of:

A.
30
B.
6
Correct Answer
C.
3
D.
1

5-08-07

This question does not yet have an explanation! Register to add one

Tags: none

5-08-08

The power of a transmitter is increased from 5 watts to 50 watts by a linear amplifier. The power gain, expressed in dB, is:

A.
30 dB
Correct Answer
B.
10 dB
C.
40 dB
D.
20 dB

5-08-08

This question does not yet have an explanation! Register to add one

Tags: none

5-08-09

You add a 9 dB gain amplifier to your 2 watt handheld. What is the power output of the combination?

A.
11 watts
Correct Answer
B.
16 watts
C.
20 watts
D.
18 watts

5-08-09

This question does not yet have an explanation! Register to add one

Tags: none

5-08-10

The power of a transmitter is increased from 2 watts to 8 watts. This is a power gain of _______ dB.

Correct Answer
A.
6 dB
B.
3 dB
C.
8 dB
D.
9 dB

5-08-10

This question does not yet have an explanation! Register to add one

Tags: none

5-08-11

A local amateur reports your 100W 2M simplex VHF transmission as 30 dB over S9. To reduce your signal to S9, you would reduce your power to _______ watts.

A.
1 W
B.
10 W
C.
33.3 W
Correct Answer
D.
100 mW

5-08-11

This question does not yet have an explanation! Register to add one

Tags: none

Log in

- or -

- or -