Canadian Basic Qualification pool, section B-004-006

Subelement B-004

B-004

Section B-004-006

B-004-006-001

On resistors with four colour bands, which colour band specifies the tolerance?

A.
First
B.
Third
C.
Second
Correct Answer
D.
Fourth

B-004-006-001

The last band in a resistor's colour code identifies 'tolerance': an allowed variance in percentage from the rated value. For example, a GOLD band means 5%.

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

Tags: none

B-004-006-002

On a resistor with four colour bands, what do the first three colour bands indicate?

Correct Answer
A.
The value of the resistor in ohms
B.
The resistance tolerance in percent
C.
The resistance material
D.
The power rating in watts

B-004-006-002

The first two bands are significant digits, the third band is a multiplier. The fourth band is tolerance.

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-004-006-003

On a resistor with four colour bands, what does the fourth colour band indicate?

A.
The value of the resistor in ohms
B.
The power rating in watts
C.
The resistance material
Correct Answer
D.
The resistance tolerance in percent

B-004-006-003

The last band in a resistor's colour code identifies 'tolerance': an allowed variance in percentage from the rated value. For example, a GOLD band means 5%.

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

Tags: none

B-004-006-004

What are the possible values of a 100-ohm resistor with a 10% tolerance?

A.
10 ohms to 100 ohms
B.
90 ohms to 100 ohms
C.
80 ohms to 120 ohms
Correct Answer
D.
90 ohms to 110 ohms

B-004-006-004

100 ohms minus 10% is 90 ohms, 100 ohms plus 10 % is 110 ohms.

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

Tags: none

B-004-006-005

On resistors with four colour bands, which colour band differentiates two resistors rated at 33 ohms and 39 ohms respectively?

A.
Third
B.
First
C.
Fourth
Correct Answer
D.
Second

B-004-006-005

The first two bands are significant digits, the third band is a multiplier. The last band is tolerance.

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

Tags: none

B-004-006-006

Out of the list of resistor tolerances below, which has the highest precision?

Correct Answer
A.
0.1%
B.
10%
C.
5%
D.
20%

B-004-006-006

Key words: HIGHEST PRECISION. The smallest possible "tolerance" will ensure that the actual value of the resistor falls within a narrow range of its rated value.

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

Tags: none

B-004-006-007

Out of the list of resistor tolerances below, which has the lowest precision?

A.
5%
B.
0.1%
Correct Answer
C.
20%
D.
10%

B-004-006-007

Key words: LOWEST PRECISION. A wide tolerance indicates that the actual value could differ more significantly from the rated value.

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

Tags: none

B-004-006-008

How does the resistance of a resistor change with rising ambient temperature?

Correct Answer
A.
It depends on its temperature coefficient
B.
It decreases
C.
It remains constant
D.
It increases

B-004-006-008

Temperature affects all components and conductors. A coefficient indicates a change as a percentage per degree Celsius. The change can be positive or negative, depending on the material.

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

Tags: none

B-004-006-009

Which resistor rating is specified as a given fraction per degree Celsius?

A.
Power rating
Correct Answer
B.
Temperature coefficient
C.
Tolerance
D.
Ohmic value

B-004-006-009

Temperature affects all components and conductors. A coefficient indicates a change as a percentage per degree Celsius. The change can be positive or negative, depending on the material.

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

Tags: none

B-004-006-010

On resistors with four colour bands, which colour band differentiates two resistors rated at 120 ohms and 1200 ohms respectively?

A.
Fourth
B.
First
C.
Second
Correct Answer
D.
Third

B-004-006-010

The first two bands are significant digits, the third band is a multiplier. The fourth band is tolerance. In this example, both first bands read '1', both second bands read '2'. The third band multiplies by 10 or 100, as the case may be.

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

Tags: none

B-004-006-011

Given that red=2, violet=7 and yellow=4, what is the nominal value of a resistor whose colour code reads "red," "violet" and "yellow"?

Correct Answer
A.
270 kilohms
B.
27 megohms
C.
274 ohms
D.
72 kilohms

B-004-006-011

The first two bands are significant digits, the third band is a multiplier. The fourth band is tolerance. In this example, the first two digits are '27' and the multiplier adds four zeroes (or multiplies by 10 000). Result = 270 000 ohms or 270 kilohms.

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

Tags: none

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