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The basic unit for measuring current flow is:
a. atomic weight
b. Coulomb
c. Volt
d. Ampere - ✔✔d. ampere
The basic unit of resistance is:
a. Ohm
b. Coulomb
c. Ampere
d. Volt - ✔✔a. ohm
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)
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,c. I=E/R or (I=V/R)
d. R=E/I or (R=V/I) - ✔✔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 - ✔✔b. volts
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 - ✔✔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
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,d. reactor - ✔✔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 - ✔✔a. amplifier
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. 60Hz interference
d. noise - ✔✔d. noise
The EEG amplifier is designed so that when input 1 is more negative than input 2, the
deflection will be - ✔✔upward
Common mode rejection is:
a. the ability of an amplifier to cancel out ECG artifact
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, 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 - ✔✔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 - ✔✔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 - ✔✔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?
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