psg Practice Exam #2 with complete
solutions 2024/2025
What is an appropriate filter setting? - ANSWER-EEG 0.3/35, EOG 0.1/35, EKG
1.0/35, EMG 10/70
What is the purpose of the LFF? - ANSWER-Eliminating unwanted slow
frequencies. DC amplifiers do not have LFF.
The ROC electrode is placed out and up from the outer corner of the right eye,
and the LOC electrode is placed out and down from the corner of the left eye. If
the ROC channel on the PSG is channel 5, and the LOC is channel 6, what will the
waves on these channels do when the patient looks up? - ANSWER-They will
move toward each other.
What is the best solution for disinfecting electrodes? - ANSWER-Antibacterial
soap
What should a technician do first to make sure a proper test is being performed?
- ANSWER-Review the chart for the physician's orders
What does a PSG record? - ANSWER-Electric potentials generated by the
patient's body, voltages generated by other devices attached to the patient,
output signals from auxiliary equipment
What is not a bioelectric recording? - ANSWER-Respiratory airflow
, What is the function of a defferentrial amplifier? - ANSWER-To record the
differences in the voltage of two inputs.
What is the selection of two signal inputs applied to a differential amplifier and
assigned to a specific channel called? - ANSWER-Recording montage,
The symbol G1 represents what? - ANSWER-The first signal input into a
differential amplifier, this is also called the exploring electrode.
What is G2 also known as? - ANSWER-Reference electrode
If G1 receives an input of -100uV and G2 simultaneously receives an input of -
50uV, what will the output voltage be? - ANSWER--50uV, you subtract the two to
get the output voltage
If G1 receives an input of -50uV and G2 simultaneously receives an input of
+50uV, what will the output signal be? - ANSWER-0, subtract the two to the the
output voltage
How is the EEG signal frequency determined? - ANSWER-Can be determined by
counting the number of waveforms recorded during the span of one second
The amplitude of an EEG signal can be determined by doing what? - ANSWER-
Comparing the height of the recorded waveform against a calibration signal of
known value
The amplitude of a wave is a measurement of what? - ANSWER-Voltage
What is a LFF used for? - ANSWER-Selectively attenuate undesirable slow
frequencies
What is a HFF used for? - ANSWER-Selectively attenuate undesirable fast
frequencies
How is sensitivity defined? - ANSWER-The ratio of input voltage to the amplitude
of the pen deflection
solutions 2024/2025
What is an appropriate filter setting? - ANSWER-EEG 0.3/35, EOG 0.1/35, EKG
1.0/35, EMG 10/70
What is the purpose of the LFF? - ANSWER-Eliminating unwanted slow
frequencies. DC amplifiers do not have LFF.
The ROC electrode is placed out and up from the outer corner of the right eye,
and the LOC electrode is placed out and down from the corner of the left eye. If
the ROC channel on the PSG is channel 5, and the LOC is channel 6, what will the
waves on these channels do when the patient looks up? - ANSWER-They will
move toward each other.
What is the best solution for disinfecting electrodes? - ANSWER-Antibacterial
soap
What should a technician do first to make sure a proper test is being performed?
- ANSWER-Review the chart for the physician's orders
What does a PSG record? - ANSWER-Electric potentials generated by the
patient's body, voltages generated by other devices attached to the patient,
output signals from auxiliary equipment
What is not a bioelectric recording? - ANSWER-Respiratory airflow
, What is the function of a defferentrial amplifier? - ANSWER-To record the
differences in the voltage of two inputs.
What is the selection of two signal inputs applied to a differential amplifier and
assigned to a specific channel called? - ANSWER-Recording montage,
The symbol G1 represents what? - ANSWER-The first signal input into a
differential amplifier, this is also called the exploring electrode.
What is G2 also known as? - ANSWER-Reference electrode
If G1 receives an input of -100uV and G2 simultaneously receives an input of -
50uV, what will the output voltage be? - ANSWER--50uV, you subtract the two to
get the output voltage
If G1 receives an input of -50uV and G2 simultaneously receives an input of
+50uV, what will the output signal be? - ANSWER-0, subtract the two to the the
output voltage
How is the EEG signal frequency determined? - ANSWER-Can be determined by
counting the number of waveforms recorded during the span of one second
The amplitude of an EEG signal can be determined by doing what? - ANSWER-
Comparing the height of the recorded waveform against a calibration signal of
known value
The amplitude of a wave is a measurement of what? - ANSWER-Voltage
What is a LFF used for? - ANSWER-Selectively attenuate undesirable slow
frequencies
What is a HFF used for? - ANSWER-Selectively attenuate undesirable fast
frequencies
How is sensitivity defined? - ANSWER-The ratio of input voltage to the amplitude
of the pen deflection
