Canadian Basic Qualification pool, section B-005-013

Subelement B-005

B-005

Section B-005-013

B-005-013-001

How is a voltmeter usually connected to a circuit under test?

A.
In series with the circuit
B.
In phase with the circuit
Correct Answer
C.
In parallel with the circuit
D.
In quadrature with the circuit

B-005-013-001

Key word: VOLTMETER. An instrument to measure voltage. The voltmeter is always connected in parallel to measure a difference of potential between two points, across a component, etc. The voltmeter must have high resistance not to affect the circuit.

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

Tags: none

B-005-013-002

How is an ammeter usually connected to a circuit under test?

Correct Answer
A.
In series with the circuit
B.
In parallel with the circuit
C.
In phase with the circuit
D.
In quadrature with the circuit

B-005-013-002

Key word: AMMETER. Ammeter comes from the words ampere + meter, it is used to measure current. Current flows THROUGH a circuit. The circuit must be 'broken' and the ammeter inserted in series with the circuit to measure current. Ammeters have very low resistance and, thus, have little effect once inserted in the circuit.

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

Tags: none

B-005-013-003

What does a multimeter measure?

A.
SWR and power
Correct Answer
B.
Voltage, current and resistance
C.
Resistance, capacitance and inductance
D.
Resistance and reactance

B-005-013-003

Common multimeters can measure the three basic electrical units: voltage (E), current (I) and resistance (R).

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

Tags: none

B-005-013-004

What is the correct instrument to measure the final power amplifier current?

A.
A voltmeter
B.
An ohmmeter
Correct Answer
C.
An ammeter
D.
A wattmeter

B-005-013-004

Key word: CURRENT. Ammeter comes from the words ampere + meter, it is used to measure current.

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

Tags: none

B-005-013-005

When measuring the voltage across a circuit component, what does the voltmeter appear to be in the circuit?

A.
A perfect conductor
B.
A low value resistance
Correct Answer
C.
A high value resistance
D.
An open circuit

B-005-013-005

Key word: VOLTAGE. The voltmeter must have high resistance not to affect the circuit.

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

Tags: none

B-005-013-006

When measuring current drawn from a DC power supply, what does the ammeter placed in the circuit appear as?

A.
A perfect conductor
B.
An additional load
Correct Answer
C.
A low value resistance
D.
A high value resistance

B-005-013-006

This is a bit of a catch. A PERFECT conductor would exhibit ZERO resistance. An ammeter actually has very low resistance. [ For example, a 10 A ammeter can have a resistance of 0.005 ohms, a 1 A ammeter can have 0.05 ohms and a 500 mA ammeter can introduce 0.2 ohms of resistance in the circuit. ]

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

Tags: none

B-005-013-007

What instrument can provide a direct measurement of power at the output of a transmitter?

A.
Ammeter
B.
Field-strength meter
Correct Answer
C.
RF wattmeter
D.
Wavemeter

B-005-013-007

Power is expressed in watts. The transmitter produces an electrical signal called "radiofrequency" (RF).

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

Tags: none

B-005-013-008

Potential difference is measured by means of:

A.
an ohmmeter
B.
a wattmeter
C.
an ammeter
Correct Answer
D.
a voltmeter

B-005-013-008

The voltmeter is always connected in parallel to measure a difference of potential between two points, across a component, etc. The voltmeter must have high resistance not to affect the circuit.

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

Tags: none

B-005-013-009

What instrument is used to measure electrical current?

A.
Wattmeter
B.
Wavemeter
C.
Voltmeter
Correct Answer
D.
Ammeter

B-005-013-009

Ammeter comes from the words ampere + meter, it is used to measure current. Current flows THROUGH a circuit. The circuit must be 'broken' and the ammeter inserted in series with the circuit to measure current. Ammeters have very low resistance and, thus, have little effect once inserted in the circuit.

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

Tags: none

B-005-013-010

What term describes the ability of an instrument to display values that are true to reality?

A.
Stability
Correct Answer
B.
Accuracy
C.
Resolution
D.
Precision

B-005-013-010

Accuracy = agreement between measured value and true value. Precision = agreement between measured values on repeated measurements. Resolution = smallest change that can be measured. Stability = consistency in measurements over time.

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 -