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Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

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2016-E7C: Filters and matching networks: types of networks; types of filters; filter applications; filter characteristics; impedance matching; DSP filtering

2016-E7C01: How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?

A capacitor is connected between the input and ground, another capacitor is connected between the output and ground, and an inductor is connected between input and output

Two inductors are in series between the input and output, and a capacitor is connected between the two inductors and ground

Two capacitors are in series between the input and output, and an inductor is connected between the two capacitors and ground

An inductor is connected between the input and ground, another inductor is connected between the output and ground, and a capacitor is connected between the input and output

2016-E7C02: Which of the following is a property of a T-network with series capacitors and a parallel shunt inductor?

It is a high-pass filter

It is a low-pass filter

It is a band-pass filter

It is a notch filter

2016-E7C03: What advantage does a Pi-L-network have over a regular Pi-network for impedance matching between the final amplifier of a vacuum-tube transmitter and an antenna?

Greater harmonic suppression

Higher efficiency

Lower losses

Greater transformation range

2016-E7C04: How does an impedance-matching circuit transform a complex impedance to a resistive impedance?

It cancels the reactive part of the impedance and changes the resistive part to a desired value

It introduces negative resistance to cancel the resistive part of impedance

It introduces transconductance to cancel the reactive part of impedance

Network resistances are substituted for load resistances and reactances are matched to the resistances

2016-E7C05: Which filter type is described as having ripple in the passband and a sharp cutoff?

A Chebyshev filter

A Butterworth filter

An active LC filter

A passive op-amp filter

2016-E7C06: What are the distinguishing features of an elliptical filter?

Extremely sharp cutoff with one or more notches in the stop band

Gradual passband rolloff with minimal stop band ripple

Extremely flat response over its pass band with gradually rounded stop band corners

Gradual passband rolloff with extreme stop band ripple

2016-E7C07: What kind of filter would you use to attenuate an interfering carrier signal while receiving an SSB transmission?

A notch filter

A band-pass filter

A Pi-network filter

An all-pass filter

2016-E7C08: Which of the following factors has the greatest effect in helping determine the bandwidth and response shape of a crystal ladder filter?

The relative frequencies of the individual crystals

The DC voltage applied to the quartz crystal

The gain of the RF stage preceding the filter

The amplitude of the signals passing through the filter

2016-E7C09: What is a Jones filter as used as part of an HF receiver IF stage?

A variable bandwidth crystal lattice filter

An automatic notch filter

A special filter that emphasizes image responses

A filter that removes impulse noise

2016-E7C10: Which of the following filters would be the best choice for use in a 2 meter repeater duplexer?

A cavity filter

A crystal filter

A DSP filter

An L-C filter

2016-E7C11: Which of the following is the common name for a filter network which is equivalent to two L-networks connected back-to-back with the two inductors in series and the capacitors in shunt at the input and output?





2016-E7C12: Which describes a Pi-L-network used for matching a vacuum tube final amplifier to a 50 ohm unbalanced output?

A Pi-network with an additional series inductor on the output

A Phase Inverter Load network

A network with only three discrete parts

A matching network in which all components are isolated from ground

2016-E7C13: What is one advantage of a Pi-matching network over an L-matching network consisting of a single inductor and a single capacitor?

The Q of Pi-networks can be varied depending on the component values chosen

L-networks cannot perform impedance transformation

Pi-networks have fewer components

Pi-networks are designed for balanced input and output

2016-E7C14: Which mode is most affected by non-linear phase response in a receiver IF filter?


Meteor scatter

Single-Sideband voice


2016-E7C15: What is a crystal lattice filter?

A filter with narrow bandwidth and steep skirts made using quartz crystals

A power supply filter made with interlaced quartz crystals

An audio filter made with four quartz crystals that resonate at 1kHz intervals

A filter with wide bandwidth and shallow skirts made using quartz crystals

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2016-E7B: Amplifiers: Class of operation; vacuum tube and solid-state circuits; distortion and intermodulation; spurious and parasitic suppression; microwave amplifiers; switching-type amplifiers
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2016-E7D: Power supplies and voltage regulators; Solar array charge controllers
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