ABRET Digital Instrumentation Questions and Answers with complete solution

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%) Gradual changes in amplitude , frequency, or spatial distribution of rhythms is known as: a. asymmetry b. attenuation c. background activity d. evolution - Answer-evolution Vertical resolution a. bits b. frequencies c. amplitude d. duration - Answer-amplitude The ability of an amplifier to reject like signals a. amplifier gain b. phase reversal c. common mode rejectiond. sensitivity - Answer-common mode rejection Which of the following principles best applies to the EEG amplifiers? a. aliasing b. sampling c. common mode rejection d. filtering - Answer-common mode rejection 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 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) 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 secc. 0.06 sec d. 0.016 sec - Answer-0.05 sec A device that alters the frequency composition of a signal: a. conductor b. filter c. transducer d. capacitor - Answer-filter