FCCライセンス General 6月 30 2024 SUBELEMENT G4A SUBELEMENT G4A G4A – Station configuration and operation 1 / 13 G4A01What is the purpose of the notch filter found on many HF transceivers? A. To restrict the transmitter voice bandwidth B. To reduce interference from carriers in the receiver passband C. To eliminate receiver interference from impulse noise sources D. To remove interfering splatter generated by signals on adjacent frequencies 2 / 13 G4A02What is the benefit of using the opposite or “reverse” sideband when receiving CW? A. Interference from impulse noise will be eliminated B. More stations can be accommodated within a given signal passband C. It may be possible to reduce or eliminate interference from other signals D. Accidental out-of-band operation can be prevented 3 / 13 G4A03How does a noise blanker work? A. By temporarily increasing received bandwidth B. By redirecting noise pulses into a filter capacitor C. By reducing receiver gain during a noise pulse D. By clipping noise peaks 4 / 13 G4A04What is the effect on plate current of the correct setting of a vacuum-tube RF power amplifier’s TUNE control? A. A pronounced peak B. A pronounced dip C. No change will be observed D. A slow, rhythmic oscillation 5 / 13 G4A05Why is automatic level control (ALC) used with an RF power amplifier? A. To balance the transmitter audio frequency response B. To reduce harmonic radiation C. To prevent excessive drive D. To increase overall efficiency 6 / 13 G4A06What is the purpose of an antenna tuner? A. Reduce the SWR in the feed line to the antenna B. Reduce the power dissipation in the feedline to the antenna C. Increase power transfer from the transmitter to the feed line D. All these choices are correct 7 / 13 G4A07What happens as a receiver’s noise reduction control level is increased? A. Received signals may become distorted B. Received frequency may become unstable C. CW signals may become severely attenuated D. Received frequency may shift several kHz 8 / 13 G4A08What is the correct adjustment for the LOAD or COUPLING control of a vacuum tube RF power amplifier? A. Minimum SWR on the antenna B. Minimum plate current without exceeding maximum allowable grid current C. Highest plate voltage while minimizing grid current D. Desired power output without exceeding maximum allowable plate current 9 / 13 G4A09What is the purpose of delaying RF output after activating a transmitter’s keying line to an external amplifier? A. To prevent key clicks on CW B. To prevent transient overmodulation C. To allow time for the amplifier to switch the antenna between the transceiver and the amplifier output D. To allow time for the amplifier power supply to reach operating level 10 / 13 G4A10What is the function of an electronic keyer? A. Automatic transmit/receive switching B. Automatic generation of dots and dashes for CW operation C. To allow time for switching the antenna from the receiver to the transmitter D. Computer interface for PSK and RTTY operation 11 / 13 G4A11Why should the ALC system be inactive when transmitting AFSK data signals? A. ALC will invert the modulation of the AFSK mode B. The ALC action distorts the signal C. When using digital modes, too much ALC activity can cause the transmitter to overheat D. All these choices are correct 12 / 13 G4A12Which of the following is a common use of the dual-VFO feature on a transceiver? A. To allow transmitting on two frequencies at once B. To permit full duplex operation -- that is, transmitting and receiving at the same time C. To transmit on one frequency and listen on another D. To improve frequency accuracy by allowing variable frequency output (VFO) operation 13 / 13 G4A13What is the purpose of using a receive attenuator? A. To prevent receiver overload from strong incoming signals B. To reduce the transmitter power when driving a linear amplifier C. To reduce power consumption when operating from batteries D. To reduce excessive audio level on strong signals Your score isThe average score is 0% 0% Restart quiz Ed 0 コメント
