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General Class Exam Question Pool

effective 7/01/2015 thru 6/30/2019

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2015-G8C: Digital emission modes

2015-G8C01: Which of the following digital modes is designed to operate at extremely low signal strength on the HF bands?

JT9 and JT65

FSK441 and Hellschreiber



2015-G8C02: How many data bits are sent in a single PSK31 character?

The number varies




2015-G8C03: What part of a data packet contains the routing and handling information?





2015-G8C04: Which of the following describes Baudot code?

A 5-bit code with additional start and stop bits

A 7-bit code with start, stop and parity bits

A code using error detection and correction

A code using SELCAL and LISTEN

2015-G8C05: In the PACTOR protocol, what is meant by an NAK response to a transmitted packet?

The receiver is requesting the packet be retransmitted

The receiver is reporting the packet was received without error

The receiver is busy decoding the packet

The entire file has been received correctly

2015-G8C06: What action results from a failure to exchange information due to excessive transmission attempts when using PACTOR or WINMOR?

The connection is dropped

The checksum overflows

Packets will be routed incorrectly

Encoding reverts to the default character set

2015-G8C07: How does the receiving station respond to an ARQ data mode packet containing errors?

It requests the packet be retransmitted

It terminates the contact

It sends the packet back to the transmitting station

It requests a change in transmitting protocol

2015-G8C08: Which of the following statements is true about PSK31?

Upper case letters use longer Varicode signals and thus slow down transmission

Upper case letters make the signal stronger

Varicode Error Correction is used to ensure accurate message reception

Higher power is needed as compared to RTTY for similar error rates

2015-G8C09: What does the number 31 represent in "PSK31"?

The approximate transmitted symbol rate

The version of the PSK protocol

The year in which PSK31 was invented

The number of characters that can be represented by PSK31

2015-G8C10: How does forward error correction (FEC) allow the receiver to correct errors in received data packets?

By transmitting redundant information with the data

By controlling transmitter output power for optimum signal strength

By using the varicode character set

By using a parity bit with each character

2015-G8C11: How are the two separate frequencies of a Frequency Shift Keyed (FSK) signal identified?

Mark and Space

Dot and Dash

On and Off

High and Low

2015-G8C12: Which type of code is used for sending characters in a PSK31 signal?





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