ABRET-EEG Review Questions with Verified
Correct Answers
Ampere
The basic unit for measuring current flow is____.
a.atomic weight
b.Coulomb
c.Volt
d.Ampere
Ohm
The basic unit of resistance is____.
a.Ohm
b.Coulomb
c.Ampere
d.Volt
R = E I or (R = V I)
Which of the following is not a valid expression of Ohm's law?
(in this equation E (electromotive force) is the dame as V (Voltage)
a. R = E I or (R = V I)
b. E = I R or (V = I R)
c. I = E / R or (I = V/R)
d. R = E / I or (R = V/ I)
Volts
,Which of the following is not a unit for measuring alternating frequencies?
a. Cycles per second
b. Volts
c. Hertz
d. Kilocycles
stores energy
Which of the following describes the action of a capacitor?
a. opposes changes in current flow
b. converts alternating current to direct current
c. creates a direct current resistance
d. stores energy
filter
A circuit that allows some frequencies to pass through it, while others are blocked is a ____.
a. resistor
b. transistor
c. filter
d. reactor
amplifier
A combination of electronic components designed to increase the power, voltage or current of
a signal
a. amplifier
b. line filter
c. master gain control
d. sensitivity
,noise
A small fluctuating output recorded by the EEG instrument even when there is no input
signal is called ____.
a. output voltage
b. linear distortion
c. 60 Hz interference
d. noise
upward
The EEG amplifier is designed so that when input 1 is more negative than input 2, the
deflection will be ____.
a. downward
b. upward
c. absent
d. sinusoidal
the characteristic of an amplifier that rejects external interference
Common Mode Rejection is ____.
a. the ability of an amplifier to cancel out ECG artifact
b. the characteristic of an amplifier that rejects external interference
c. is dependent on the sampling rate
d. controlled by the 60-cycle notch filter
0.1 Hz
Which of the following is most attenuated by a low frequency filter of 1 Hz?
a. 0.5 Hz
, b. 5.0 Hz
c. 10.0 Hz
d. 0.1 Hz
for the deflection to fall (decay) to 37% of the peak deflection
Time constant is defined as the time required ____.
a. for the deflection to fall (decay) to 47% of the peak deflection
b. for the deflection to fall (decay) 57% of the peak deflection
c. for the deflection to fall (decay) 77% of the peak deflection
d. for the deflection to fall (decay) to 37% of the peak deflection
spike 10 mm, wave 6 mm
An EEG record has three per second spike/wave discharges. Both the spike and the slow
wave have voltages of 100 µV. If this discharge is recorded with a low frequency filter of 5
Hz and a sensitivity of 10 µV/mm, what would be the deflection of the spike and the
wave?
a. spike 10 mm, wave 6 mm
b. spike 6 mm, wave 10 mm
c. spike 10mm, wave 10 mm
d. spike 6 mm, wave 6 mm
40%
A high frequency setting of 35 Hz would attenuate 50 Hz muscle activity by approximately
what percentage?
a. 10%
b. 20%
Correct Answers
Ampere
The basic unit for measuring current flow is____.
a.atomic weight
b.Coulomb
c.Volt
d.Ampere
Ohm
The basic unit of resistance is____.
a.Ohm
b.Coulomb
c.Ampere
d.Volt
R = E I or (R = V I)
Which of the following is not a valid expression of Ohm's law?
(in this equation E (electromotive force) is the dame as V (Voltage)
a. R = E I or (R = V I)
b. E = I R or (V = I R)
c. I = E / R or (I = V/R)
d. R = E / I or (R = V/ I)
Volts
,Which of the following is not a unit for measuring alternating frequencies?
a. Cycles per second
b. Volts
c. Hertz
d. Kilocycles
stores energy
Which of the following describes the action of a capacitor?
a. opposes changes in current flow
b. converts alternating current to direct current
c. creates a direct current resistance
d. stores energy
filter
A circuit that allows some frequencies to pass through it, while others are blocked is a ____.
a. resistor
b. transistor
c. filter
d. reactor
amplifier
A combination of electronic components designed to increase the power, voltage or current of
a signal
a. amplifier
b. line filter
c. master gain control
d. sensitivity
,noise
A small fluctuating output recorded by the EEG instrument even when there is no input
signal is called ____.
a. output voltage
b. linear distortion
c. 60 Hz interference
d. noise
upward
The EEG amplifier is designed so that when input 1 is more negative than input 2, the
deflection will be ____.
a. downward
b. upward
c. absent
d. sinusoidal
the characteristic of an amplifier that rejects external interference
Common Mode Rejection is ____.
a. the ability of an amplifier to cancel out ECG artifact
b. the characteristic of an amplifier that rejects external interference
c. is dependent on the sampling rate
d. controlled by the 60-cycle notch filter
0.1 Hz
Which of the following is most attenuated by a low frequency filter of 1 Hz?
a. 0.5 Hz
, b. 5.0 Hz
c. 10.0 Hz
d. 0.1 Hz
for the deflection to fall (decay) to 37% of the peak deflection
Time constant is defined as the time required ____.
a. for the deflection to fall (decay) to 47% of the peak deflection
b. for the deflection to fall (decay) 57% of the peak deflection
c. for the deflection to fall (decay) 77% of the peak deflection
d. for the deflection to fall (decay) to 37% of the peak deflection
spike 10 mm, wave 6 mm
An EEG record has three per second spike/wave discharges. Both the spike and the slow
wave have voltages of 100 µV. If this discharge is recorded with a low frequency filter of 5
Hz and a sensitivity of 10 µV/mm, what would be the deflection of the spike and the
wave?
a. spike 10 mm, wave 6 mm
b. spike 6 mm, wave 10 mm
c. spike 10mm, wave 10 mm
d. spike 6 mm, wave 6 mm
40%
A high frequency setting of 35 Hz would attenuate 50 Hz muscle activity by approximately
what percentage?
a. 10%
b. 20%
