1
ABRET (4) Questions with Answers (100%
Correct Answers)
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
, 2
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
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
ABRET (4) Questions with Answers (100%
Correct Answers)
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
, 2
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
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
