The basic unit of resistance is:
a. Ohm
b. Coulomb
c. Ampere
d. Volt - ANSWER a. ohm
The basic unit for measuring current flow is:
a. atomic weight
b. Coulomb
c. Volt
d. Ampere - ANSWER d. ampere
Which of the following is NOT a valid expression of Ohm's Law:
a. R=EI or (R=VI)
b. E=IR or (V=IR)
c. I=E/R or (I=V/R)
d. R=E/I or (R=V/I) - ANSWER a. R=EI or (R=VI)
Which of the following is NOT a unit for measuring alternating frequencies:
a. cycles per second
b. volts
c. hertz
d. kilocycles - ANSWER b. volts
1
,Which of the following describes the action of a capacitor?
a. opposes changes in current flow
b. converts A/C to D/C
c. creates a direct current resistance
d. stores energy - ANSWER d. stores energy
A circuit that allows some frequencies to pass through it, while others are blocked is a:
a. resistor
b. transistor
c. filter
d. reactor - ANSWER c. filter
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 - ANSWER a. amplifier
A small fluctuating output recorded by the EEG instrument even when there is no input sig-
nal is called:
a. output voltage
b. linear distortion
c. 60Hz interference
d. noise - ANSWER d. noise
2
,The EEG amplifier is designed so that when input 1 is more negative than input 2, the deflec-
tion will be - ANSWER upward
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. controlle by the 60-cycle notch filter - ANSWER b. the characteristic of an amplifier
that rejects external interference
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 - ANSWER d. 0.1 Hz
Time constant is defined as the time required for the deflection to fall (decay):
a. to 47% of the peak deflection
b. 57% of the peak deflection
c. 77% of the peak deflection
d. to 37% of the peak deflection - ANSWER d. to 37% of the peak deflection
An EEG record has 3/sec spike & wave discharges. Both the spike and the slow wave have
voltages of 100uV. If this discharge is recorded with a LFF of 5Hz and a sensitivity of
10uV/mm, what would be the deflection of the spike and the wave?
a. spike 10mm & wave 6mm
b. spike 6mm & wave 10mm
c. spike 10mm & wave 10mm
d. spike 6mm & wave 6mm - ANSWER a. spike 10mm wave 6mm
3
, According to ACNS Guidelines, Recording on Clinical EEG on Digital Media requires monitors
to have between 25 & 35mm/second horizontal scaling and a:
a. maximum of 1,000 data points/second to accurately display EEG on the monitor screen
b. minimum of 100 data points/second to accurately display EEG on the monitor screen
c. maximum of 100 data points/second to accurately display EEG on the monitor screen
d. minimum of 1,000 data points/second to accurately display EEG on the monitor screen -
ANSWER b. MINIMUM of 100 data points/second to accurately display EEG on the moni-
tor screen
A high frequency setting of 35Hz would attenuate 50Hz muscle activity by approximately
what percentage:
a. 10%
b. 20%
c. 40%
d. 100% - ANSWER c. 40%
The filters creating a very narrow band pass that should RARELY be used clinically are:
a. LFF 5.0Hz & HFF 70Hz
b. LFF 5.0Hz & HFF 15Hz
c. LFF 0.1Hz & HFF 70Hz
d. LFF 0.1Hz & HFF 15Hz - ANSWER b. LFF 5.0Hz & HFF 15Hz
During the recording of cerebral activity, the calibration input voltage is changed from 50uV
to 100uV...what will be the result?
a. no effect on the activity being recorded
b. a two-fold increase in amplitude
c. a one-half reduction of amplitude
d. clipping of the waveform - ANSWER a. no effect on the activity being recorded
4
a. Ohm
b. Coulomb
c. Ampere
d. Volt - ANSWER a. ohm
The basic unit for measuring current flow is:
a. atomic weight
b. Coulomb
c. Volt
d. Ampere - ANSWER d. ampere
Which of the following is NOT a valid expression of Ohm's Law:
a. R=EI or (R=VI)
b. E=IR or (V=IR)
c. I=E/R or (I=V/R)
d. R=E/I or (R=V/I) - ANSWER a. R=EI or (R=VI)
Which of the following is NOT a unit for measuring alternating frequencies:
a. cycles per second
b. volts
c. hertz
d. kilocycles - ANSWER b. volts
1
,Which of the following describes the action of a capacitor?
a. opposes changes in current flow
b. converts A/C to D/C
c. creates a direct current resistance
d. stores energy - ANSWER d. stores energy
A circuit that allows some frequencies to pass through it, while others are blocked is a:
a. resistor
b. transistor
c. filter
d. reactor - ANSWER c. filter
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 - ANSWER a. amplifier
A small fluctuating output recorded by the EEG instrument even when there is no input sig-
nal is called:
a. output voltage
b. linear distortion
c. 60Hz interference
d. noise - ANSWER d. noise
2
,The EEG amplifier is designed so that when input 1 is more negative than input 2, the deflec-
tion will be - ANSWER upward
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. controlle by the 60-cycle notch filter - ANSWER b. the characteristic of an amplifier
that rejects external interference
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 - ANSWER d. 0.1 Hz
Time constant is defined as the time required for the deflection to fall (decay):
a. to 47% of the peak deflection
b. 57% of the peak deflection
c. 77% of the peak deflection
d. to 37% of the peak deflection - ANSWER d. to 37% of the peak deflection
An EEG record has 3/sec spike & wave discharges. Both the spike and the slow wave have
voltages of 100uV. If this discharge is recorded with a LFF of 5Hz and a sensitivity of
10uV/mm, what would be the deflection of the spike and the wave?
a. spike 10mm & wave 6mm
b. spike 6mm & wave 10mm
c. spike 10mm & wave 10mm
d. spike 6mm & wave 6mm - ANSWER a. spike 10mm wave 6mm
3
, According to ACNS Guidelines, Recording on Clinical EEG on Digital Media requires monitors
to have between 25 & 35mm/second horizontal scaling and a:
a. maximum of 1,000 data points/second to accurately display EEG on the monitor screen
b. minimum of 100 data points/second to accurately display EEG on the monitor screen
c. maximum of 100 data points/second to accurately display EEG on the monitor screen
d. minimum of 1,000 data points/second to accurately display EEG on the monitor screen -
ANSWER b. MINIMUM of 100 data points/second to accurately display EEG on the moni-
tor screen
A high frequency setting of 35Hz would attenuate 50Hz muscle activity by approximately
what percentage:
a. 10%
b. 20%
c. 40%
d. 100% - ANSWER c. 40%
The filters creating a very narrow band pass that should RARELY be used clinically are:
a. LFF 5.0Hz & HFF 70Hz
b. LFF 5.0Hz & HFF 15Hz
c. LFF 0.1Hz & HFF 70Hz
d. LFF 0.1Hz & HFF 15Hz - ANSWER b. LFF 5.0Hz & HFF 15Hz
During the recording of cerebral activity, the calibration input voltage is changed from 50uV
to 100uV...what will be the result?
a. no effect on the activity being recorded
b. a two-fold increase in amplitude
c. a one-half reduction of amplitude
d. clipping of the waveform - ANSWER a. no effect on the activity being recorded
4
