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ABRET (4) Exam Questions And Answers
|Latest 2025 | Guaranteed Pass.
The amount by which the differential amplifier increases the magnitude of the input signal is...?
- Answer✔Sensitivity
What is a device that alters the frequency composition of a signal? - Answer✔Filter
High data sampling rates in a digital EEG Machine creates... - Answer✔smooth, connected lines
Which of the following is not useful in digital EEG recordings? - Answer✔Bio-calibration
Slow sampling rate may cause fast frequencies to appear slower, the term for this is...? -
Answer✔Aliasing
Digital EEG montages are reformatted by using... - Answer✔an average reference
Clipping of the waveforms occurs when? - Answer✔the signal is outside the range of the
digitizer
What is voltage resolution? - Answer✔an analog-to-digital converter
What occurs when a signal common to both inputs when using a differential amplifier has like
frequencies, amplitudes, and phases are - Answer✔cancellation
What kind of amplifier uses Common Mode Rejection? - Answer✔A differential amplifier
In a differential amplifier, if input 1 receives a voltage of +50 µV and input 2 a voltage -100 µV,
the output voltage and deflection would be approximately...? - Answer✔150 µV downward
The sharpness of the frequency response curve is determined by the filters - Answer✔Roll-off
The amount by which the differential amplifier increases the magnitude of the input signal is
dependant on...? - Answer✔Sensitivity
A device that alters the frequency composition of a signal is...? - Answer✔Filter
The ability of an amplifier to reject like signals is called...? - Answer✔Common Mode Rejection
1|Page
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 8:22PM. A+
The basic unit for measuring current flow is...? - Answer✔Ampere
The basic unit of resistance is...? - Answer✔Ohm
Which of the following is not a unit for measuring alternating frequencies? - Answer✔Volts
Which of the following describes the action of a capacitor? - Answer✔Stores energy
A circuit that allows some frequencies to pass through it, while other are blocked is called a...? -
Answer✔Filter
A combination of electronic components designed to increase the power, voltage or current of
a signal is called...? - Answer✔an amplifier
A small fluctuating output recorded by the EEG instrument even when there is no input signal is
called...? - Answer✔noise
The EEG amplifier is designed so that when input 1 is more negative than input2, the deflection
will be...? - Answer✔an upward deflection
Common Mode Rejection is - Answer✔the characteristic of an amplifier that rejects external
interference
Which of the following is most attenuated by a low frequency filter of 1 Hz? - Answer✔0.1 Hz
Time constant is defined as ...? - Answer✔the time required: for the deflection to fall (decay)
37% of the peak deflection
An EEG record has three per second spike & wave discharges. Both the spike and the slow wave
have voltages of 100 µV/mm, what would be the deflection of the spike and the wave? -
Answer✔Spike 10 mm, wave 6 mm
A high frequency setting of 35 Hz would attenuate 50 Hz muscle activity by approximately what
percentage? - Answer✔40 %
According to ACNS Guidelines, Recording Clinical EEG on Digital Media requires monitors to
have...? - Answer✔Between 25 and 35 mm/second horizontal scaling and a minimum of 100
data points/second to accurately display EEG on the monitor screen
The filters creating a very narrow band pass that should rarely be used clinically are called...? -
Answer✔LFF 5.0 Hz and HFF 15 Hz
During the recording of cerebral activity, the calibration input voltage is changed from 50 µV to
100 µV. What will be the result? - Answer✔No effect on the activity being recorded
A spike is printed out on paper and measures 16 mm peak to peak, the sensitivity of the
instrument is 7 µV/mm and a calibration signal of 50 µV causes a deflection of 7.1 mm. What is
the voltage of the spike? - Answer✔112 µV
2|Page
ABRET (4) Exam Questions And Answers
|Latest 2025 | Guaranteed Pass.
The amount by which the differential amplifier increases the magnitude of the input signal is...?
- Answer✔Sensitivity
What is a device that alters the frequency composition of a signal? - Answer✔Filter
High data sampling rates in a digital EEG Machine creates... - Answer✔smooth, connected lines
Which of the following is not useful in digital EEG recordings? - Answer✔Bio-calibration
Slow sampling rate may cause fast frequencies to appear slower, the term for this is...? -
Answer✔Aliasing
Digital EEG montages are reformatted by using... - Answer✔an average reference
Clipping of the waveforms occurs when? - Answer✔the signal is outside the range of the
digitizer
What is voltage resolution? - Answer✔an analog-to-digital converter
What occurs when a signal common to both inputs when using a differential amplifier has like
frequencies, amplitudes, and phases are - Answer✔cancellation
What kind of amplifier uses Common Mode Rejection? - Answer✔A differential amplifier
In a differential amplifier, if input 1 receives a voltage of +50 µV and input 2 a voltage -100 µV,
the output voltage and deflection would be approximately...? - Answer✔150 µV downward
The sharpness of the frequency response curve is determined by the filters - Answer✔Roll-off
The amount by which the differential amplifier increases the magnitude of the input signal is
dependant on...? - Answer✔Sensitivity
A device that alters the frequency composition of a signal is...? - Answer✔Filter
The ability of an amplifier to reject like signals is called...? - Answer✔Common Mode Rejection
1|Page
, ©FYNDLAY 2024/2025 ALL RIGHTS RESERVED 8:22PM. A+
The basic unit for measuring current flow is...? - Answer✔Ampere
The basic unit of resistance is...? - Answer✔Ohm
Which of the following is not a unit for measuring alternating frequencies? - Answer✔Volts
Which of the following describes the action of a capacitor? - Answer✔Stores energy
A circuit that allows some frequencies to pass through it, while other are blocked is called a...? -
Answer✔Filter
A combination of electronic components designed to increase the power, voltage or current of
a signal is called...? - Answer✔an amplifier
A small fluctuating output recorded by the EEG instrument even when there is no input signal is
called...? - Answer✔noise
The EEG amplifier is designed so that when input 1 is more negative than input2, the deflection
will be...? - Answer✔an upward deflection
Common Mode Rejection is - Answer✔the characteristic of an amplifier that rejects external
interference
Which of the following is most attenuated by a low frequency filter of 1 Hz? - Answer✔0.1 Hz
Time constant is defined as ...? - Answer✔the time required: for the deflection to fall (decay)
37% of the peak deflection
An EEG record has three per second spike & wave discharges. Both the spike and the slow wave
have voltages of 100 µV/mm, what would be the deflection of the spike and the wave? -
Answer✔Spike 10 mm, wave 6 mm
A high frequency setting of 35 Hz would attenuate 50 Hz muscle activity by approximately what
percentage? - Answer✔40 %
According to ACNS Guidelines, Recording Clinical EEG on Digital Media requires monitors to
have...? - Answer✔Between 25 and 35 mm/second horizontal scaling and a minimum of 100
data points/second to accurately display EEG on the monitor screen
The filters creating a very narrow band pass that should rarely be used clinically are called...? -
Answer✔LFF 5.0 Hz and HFF 15 Hz
During the recording of cerebral activity, the calibration input voltage is changed from 50 µV to
100 µV. What will be the result? - Answer✔No effect on the activity being recorded
A spike is printed out on paper and measures 16 mm peak to peak, the sensitivity of the
instrument is 7 µV/mm and a calibration signal of 50 µV causes a deflection of 7.1 mm. What is
the voltage of the spike? - Answer✔112 µV
2|Page
