Canadian Basic Qualification pool, section B-005-012

Subelement B-005

B-005

Section B-005-012

B-005-012-001

Resonance is the condition that exists when:

Correct Answer
A.
inductive reactance and capacitive reactance are equal
B.
resistance is equal to the reactance
C.
inductive reactance is the only opposition in the circuit
D.
the circuit contains no resistance

B-005-012-001

Resonance is the condition where Inductive Reactance (XL) is equal in value to Capacitive Reactance (XC). For a given Inductance (L, a coil or inductor) and Capacitance (C, a capacitor), resonance happens at one frequency: the resonant frequency. At resonance, the two reactances cancel each other, only resistance is left 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-005-012-002

At resonance, what impedance does a parallel tuned circuit exhibit?

A.
Impedance equal to resistance of the circuit
B.
Low impedance
Correct Answer
C.
High impedance
D.
Impedance equal to reactance of the circuit

B-005-012-002

Key words: PARALLEL, TUNED. The question refers to Resonance. The one frequency at which Inductive Reactance cancels Capacitive Reactance. In a PARALLEL circuit, Impedance (Z) at resonance is HIGH ( series circuit will be the opposite ). As a memory aid, try to visualize the PARALLEL circuit as a tub or tank, signals get trapped at resonance. Try to visualize the SERIES circuit as a slim tube, signals slip right through at resonance.

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

Tags: none

B-005-012-003

While the resonant frequency of a tuned circuit is a single frequency, the effect of resonance is significant over a certain range of frequencies. What is this range called?

A.
Response curve
B.
Shape factor
Correct Answer
C.
Bandwidth
D.
Quality factor

B-005-012-003

The bandwidth of a tuned circuit is the range of frequencies over which its response remains within a certain percentage of its response at the resonant frequency. Bandwidth is related to the Q (quality) factor of the tuned 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-005-012-004

What two components are required to form a tuned circuit?

A.
Diode and transistor
B.
Resistor and transistor
Correct Answer
C.
Inductor and capacitor
D.
Capacitor and resistor

B-005-012-004

A 'tuned' circuit is a synonym for a 'resonant' circuit. Resonance is the condition where Inductive Reactance (XL) is equal in value to Capacitive Reactance (XC). Inductors and Capacitors alone determine the resonant frequency of a 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-005-012-005

When a parallel coil-capacitor combination is supplied with AC of different frequencies, there will be one frequency where the impedance will be highest. This is the:

A.
inductive frequency
B.
reactive frequency
Correct Answer
C.
resonant frequency
D.
maximum frequency

B-005-012-005

Key words: COIL, CAPACITOR. A 'tuned' circuit. The question refers to Resonance. The one frequency at which Inductive Reactance cancels Capacitive Reactance. In a PARALLEL circuit, Impedance (Z) at resonance is HIGH ( series circuit will be the opposite ). As a memory aid, try to visualize the PARALLEL circuit as a tub or tank, signals get trapped at resonance. Try to visualize the SERIES circuit as a slim tube, signals slip right through at resonance.

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

Tags: none

B-005-012-006

In a parallel-resonant circuit at resonance, the circuit has:

A.
low impedance
Correct Answer
B.
high impedance
C.
high mutual inductance
D.
low mutual inductance

B-005-012-006

Key words: PARALLEL, RESONANT. The question refers to Resonance. The one frequency at which Inductive Reactance cancels Capacitive Reactance. In a PARALLEL circuit, Impedance (Z) at resonance is HIGH ( series circuit will be the opposite ). As a memory aid, try to visualize the PARALLEL circuit as a tub or tank, signals get trapped at resonance. Try to visualize the SERIES circuit as a slim tube, signals slip right through at resonance.

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

Tags: none

B-005-012-007

In a series resonant circuit at resonance, the circuit has:

A.
high mutual inductance
B.
low mutual inductance
Correct Answer
C.
low impedance
D.
high impedance

B-005-012-007

Key words: SERIES, RESONANT. The question refers to Resonance. The one frequency at which Inductive Reactance cancels Capacitive Reactance. In a SERIES circuit, Impedance (Z) at resonance is LOW ( parallel circuit will be the opposite ). If Impedance is low (little total opposition), current will be high. As a memory aid, try to visualize the SERIES circuit as a slim tube, signals slip right through at resonance. Try to visualize the PARALLEL circuit as a tub or tank, signals get trapped at resonance.

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

Tags: none

B-005-012-008

A coil and an air-spaced capacitor are arranged to form a resonant circuit. The resonant frequency will remain the same if we:

A.
wind more turns on the coil
B.
increase the area of plates in the capacitor
C.
insert Mylar sheets between the plates of the capacitor
Correct Answer
D.
add a resistor to the circuit

B-005-012-008

Resonance is affected exclusively by Inductance (L in henries for inductors) and Capacitance ( C in farads for capacitors ). Capacitance is affected by the area of the plates and the choice of dielectric. Inductance is affected by the number of turns in a coil.

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

Tags: none

B-005-012-009

Resonant circuits in a receiver are used to:

A.
filter direct current
B.
adjust voltage levels
C.
amplify audio signals
Correct Answer
D.
select the desired signal frequencies

B-005-012-009

Resonance is about choosing a frequency (or narrow range of frequencies) over others, either to eliminate it or favour it.

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

Tags: none

B-005-012-010

Resonance is the condition that exists when:

A.
the circuit contains no resistance
B.
inductive reactance is the only opposition in the circuit
C.
resistance is equal to the reactance
Correct Answer
D.
inductive reactance and capacitive reactance are equal and opposite in sign

B-005-012-010

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

Tags: none

B-005-012-011

What happens to current when a series RLC circuit is tuned to the frequency of the source?

A.
It reaches minimum
Correct Answer
B.
It reaches maximum
C.
It is limited by inductive reactance
D.
It is limited by capacitive reactance

B-005-012-011

Key words: SERIES, TUNED. The question refers to Resonance. The one frequency at which Inductive Reactance cancels Capacitive Reactance. In a SERIES circuit, Impedance (Z) at resonance is LOW ( parallel circuit will be the opposite ). If Impedance is low (little total opposition), current will be high. As a memory aid, try to visualize the SERIES circuit as a slim tube, signals slip right through at resonance. Try to visualize the PARALLEL circuit as a tub or tank, signals get trapped at resonance.

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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