Exam Primer

# 5.12 Resonance and Tuned Circuits

## Practice

B-005-12-01
Resonance is the condition that exists when:
inductive reactance and capacitive reactance are equal
inductive reactance is the only opposition in the circuit
the circuit contains no resistance
resistance is equal to the reactance

B-005-12-02
Parallel tuned circuits offer:
low impedance at resonance
zero impedance at resonance
an impedance equal to resistance of the circuit
very high impedance at resonance

B-005-12-03
Resonance is an electrical property used to describe:
an inductor
a set of parallel inductors
the results of tuning a varicap (varactor)
the frequency characteristic of a coil and capacitor circuit

B-005-12-04
A tuned circuit is formed from two basic components. These are:
resistors and transistors
directors and reflectors
diodes and transistors
inductors and capacitors

B-005-12-05
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:
resonant frequency
impedance frequency
inductive frequency
reactive frequency

B-005-12-06
In a parallel-resonant circuit at resonance, the circuit has a:
low impedance
low mutual inductance
high mutual inductance
high impedance

B-005-12-07
In a series resonant circuit at resonance, the circuit has:
low impedance
high impedance
low mutual inductance
high mutual inductance

B-005-12-08
A coil and an air-spaced capacitor are arranged to form a resonant circuit. The resonant frequency will remain the same if we:
increase the area of plates in the capacitor
replace the air dielectric with oil in the capacitor
wind more turns on the coil
add a resistor to the circuit

B-005-12-09
Resonant circuits in a receiver are used to:
filter direct current
select signal frequencies
increase power

B-005-12-10
Resonance is the condition that exists when:
inductive reactance and capacitive reactance are equal and opposite in sign
inductive reactance is the only opposition in the circuit
the circuit contains no resistance
resistance is equal to the reactance

B-005-12-11
When a series LCR circuit is tuned to the frequency of the source, the:
line current lags the applied voltage
line current leads the applied voltage
line current reaches maximum
impedance is maximum