Ham Radio Extra Questions Till 2020 Set E7C

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

• A. Two inductors are in series between the input and output, and a capacitor is connected between the two inductors and ground
• B. Two capacitors are in series between the input and output, and an inductor is connected between the two capacitors and ground
• C. 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
• D. 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

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

• A. It is a low-pass filter
• B. It is a band-pass filter
• C. It is a high-pass filter
• D. It is a notch filter

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?

• A. Greater harmonic suppression
• B. Higher efficiency
• C. Lower losses
• D. Greater transformation range

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

• A. It introduces negative resistance to cancel the resistive part of impedance
• B. It introduces transconductance to cancel the reactive part of impedance
• C. It cancels the reactive part of the impedance and changes the resistive part to a desired value
• D. Network resistances are substituted for load resistances and reactances are matched to the resistances

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

• A. A Butterworth filter
• B. An active LC filter
• C. A passive op-amp filter
• D. A Chebyshev filter

E7C06 What are the distinguishing features of an elliptical filter?

• A. Gradual passband rolloff with minimal stop band ripple
• B. Extremely flat response over its pass band with gradually rounded stop band corners
• C. Extremely sharp cutoff with one or more notches in the stop band
• D. Gradual passband rolloff with extreme stop band ripple

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

• A. A band-pass filter
• B. A notch filter
• C. A Pi-network filter
• D. An all-pass filter

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

• A. The relative frequencies of the individual crystals
• B. The DC voltage applied to the quartz crystal
• C. The gain of the RF stage preceding the filter
• D. The amplitude of the signals passing through the filter

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

• A. An automatic notch filter
• B. A variable bandwidth crystal lattice filter
• C. A special filter that emphasizes image responses
• D. A filter that removes impulse noise

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

• A. A crystal filter
• B. A cavity filter
• C. A DSP filter
• D. An L-C filter