ABRET DIGITAL INSTRUMENTATION FREQUENTLY
TESTED ACTUAL EXAM QUESTIONS WITH CORRECT
ANSWERS
Question 1.
A LFF setting of 5 Hz will attenuate a 5 Hz wave by approximately:
a. 0.3
b. 30 mm
c. 0.05
d. 5 mm
ANSWER
0.3 (LFF of 5 Hz will attenuate a 5 Hz wave by 30%)
Question 2.
Gradual changes in amplitude , frequency, or spatial distribution of rhythms is known as:
a. asymmetry
b. attenuation
c. background activity
d. evolution
ANSWER
evolution
Question 3.
Vertical resolution
a. bits
b. frequencies
c. amplitude
d. duration
ANSWER
amplitude
Question 4.
The ability of an amplifier to reject like signals
a. amplifier gain
b. phase reversal
c. common mode rejection
d. sensitivity
ANSWER
common mode rejection
1
, Question 5.
Which of the following principles best applies to the EEG amplifiers?
b. sampling
c. common mode rejection
d. filtering
ANSWER
common mode rejection
Question 6.
Increasing the number of seconds displayed on the monitor
a. decreases spike duration
b. increases spike amplitude
c. does not change spike amplitude or duration
d. increases spike duration
ANSWER
does not change spike amplitude or duration
Question 7.
Which of the following is the most appropriate sampling rate that should be used for a HFF
setting of 70 Hz, according to Nyquist theory?
a. 20 p/sec
b. 210 p/sec
c. 10 p/sec
d. 140 p/sec
ANSWER
140 p/sec (Nyquist theory is 2x the setting, ACNS Guidelines is 3x the setting)
Question 8.
For low frequency filter (LFF), the corresponding time constants for LFF cutoff frequency of 3 Hz
would be
a. 0.05 sec
b. 0.03 sec
c. 0.06 sec
d. 0.016 sec
ANSWER
0.05 sec
2
TESTED ACTUAL EXAM QUESTIONS WITH CORRECT
ANSWERS
Question 1.
A LFF setting of 5 Hz will attenuate a 5 Hz wave by approximately:
a. 0.3
b. 30 mm
c. 0.05
d. 5 mm
ANSWER
0.3 (LFF of 5 Hz will attenuate a 5 Hz wave by 30%)
Question 2.
Gradual changes in amplitude , frequency, or spatial distribution of rhythms is known as:
a. asymmetry
b. attenuation
c. background activity
d. evolution
ANSWER
evolution
Question 3.
Vertical resolution
a. bits
b. frequencies
c. amplitude
d. duration
ANSWER
amplitude
Question 4.
The ability of an amplifier to reject like signals
a. amplifier gain
b. phase reversal
c. common mode rejection
d. sensitivity
ANSWER
common mode rejection
1
, Question 5.
Which of the following principles best applies to the EEG amplifiers?
b. sampling
c. common mode rejection
d. filtering
ANSWER
common mode rejection
Question 6.
Increasing the number of seconds displayed on the monitor
a. decreases spike duration
b. increases spike amplitude
c. does not change spike amplitude or duration
d. increases spike duration
ANSWER
does not change spike amplitude or duration
Question 7.
Which of the following is the most appropriate sampling rate that should be used for a HFF
setting of 70 Hz, according to Nyquist theory?
a. 20 p/sec
b. 210 p/sec
c. 10 p/sec
d. 140 p/sec
ANSWER
140 p/sec (Nyquist theory is 2x the setting, ACNS Guidelines is 3x the setting)
Question 8.
For low frequency filter (LFF), the corresponding time constants for LFF cutoff frequency of 3 Hz
would be
a. 0.05 sec
b. 0.03 sec
c. 0.06 sec
d. 0.016 sec
ANSWER
0.05 sec
2
