(C)

B-005-010-001 How does a coil react to AC?

A As the amplitude of the applied AC increases, the reactance increases

B As the frequency of the applied AC increases, the reactance decreases

C As the frequency of the applied AC increases, the reactance increases

D As the amplitude of the applied AC increases, the reactance decreases

B-005-010-002 How does a capacitor react to AC?

A As the frequency of the applied AC increases, the reactance increases

B As the amplitude of the applied AC increases, the reactance increases

C As the amplitude of the applied AC increases, the reactance decreases

D As the frequency of the applied AC increases, the reactance decreases

B-005-010-003 The reactance of capacitors increases as:

A applied voltage decreases

B frequency increases

C frequency decreases

D applied voltage increases

B-005-010-005 Capacitive reactance:

A increases as frequency increases

B increases with the time constant

C decreases as frequency increases

D applies only to series RLC circuits

B-005-010-006 Inductive reactance may be increased by:

A a decrease in the supplied current

B an increase in the applied voltage

C an increase in the applied frequency

D a decrease in the applied frequency

B-005-010-007 What property allows a coil wound on a ferrite core to mitigate the effects of an offending radio signal?

A High reactance at audio frequencies

B High reactance at radio frequencies

C Low reactance at radio frequencies

D Low reactance at audio frequencies

B-005-010-008 What property allows an RF bypass capacitor on an audio circuit to divert an offending radio signal?

A High reactance at audio frequencies

B Low reactance at radio frequencies

C High reactance at radio frequencies

D Low reactance at audio frequencies

B-005-010-009 What property allows an RF bypass capacitor to have little effect on an audio circuit?

A High reactance at low frequencies

B Low reactance at high frequencies

C High reactance at high frequencies

D Low reactance at low frequencies

B-005-010-010 What property allows an RF choke coil to have little effect on signals meant to flow through the coil?

A High reactance at low frequencies

B Low reactance at high frequencies

C High reactance at high frequencies

D Low reactance at low frequencies

B-005-010-011 In general, the reactance of inductors increases with:

A increasing AC frequency

B decreasing AC frequency

C decreasing applied voltage

D increasing applied voltage

(D)

B-005-010-004 In inductances, AC may be opposed by both resistance of winding wire and reactance due to inductive effect. The term which includes resistance and reactance is:

A resonance

B inductance

C capacitance

D impedance

(B)

B-005-012-001 Resonance is the condition that exists when:

A resistance is equal to the reactance

B inductive reactance and capacitive reactance are equal

C inductive reactance is the only opposition in the circuit

D the circuit contains no resistance

B-005-012-002 Parallel tuned circuits offer:

A high impedance at resonance

B low impedance at resonance

C zero impedance at resonance

D an impedance equal to resistance of the circuit

B-005-012-003 Resonance is an electrical property used to describe:

A the results of tuning a varicap

B the frequency characteristic of a coil and capacitor circuit

C an inductor

D a set of parallel inductors

B-005-012-004 A tuned circuit is formed from two basic components. These are:

A inductors and capacitors

B resistors and transistors

C directors and reflectors

D diodes and transistors

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 resonant frequency

B impedance frequency

C inductive frequency

D reactive frequency

B-005-012-006 In a parallel-resonant circuit at resonance, the circuit has a:

A low mutual inductance

B high mutual inductance

C high impedance

D low impedance

B-005-012-007 In a series resonant circuit at resonance, the circuit has:

A low impedance

B high impedance

C low mutual inductance

D high mutual inductance

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 add a resistor to the circuit

B increase the area of plates in the capacitor

C insert Mylar sheets between the plates of the capacitor

D wind more turns on the coil

B-005-012-009 Resonant circuits in a receiver are used to:

A filter direct current

B increase power

C adjust voltage levels

D select signal frequencies

A inductive reactance is the only opposition in the circuit

B the circuit contains no resistance

C resistance is equal to the reactance

D inductive reactance and capacitive reactance are equal and opposite in sign

(C)

B-005-012-011 When a series LCR circuit is tuned to the frequency of the source, the:

A line current leads the applied voltage

B impedance is maximum

C line current reaches maximum

D line current lags the applied voltage

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March 17, 2018