ABRET Board Exam Questions With Complete Solutions.

ABRET Board Exam Questions With Complete Solutions. The basic unit for measuring current flow is A. atomic weight B. Coulomb C. Volt D. Ampere - Answer D. Ampere The basic unit of resistance A. Ohm B. Coulomb C. Ampere D. Volt - Answer 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) 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 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 - 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 signal is called... A. output voltage B. Linear Distortion ABRET Board Exam Questions With Complete Solutions. C. 60Hz interferance D. Noise - Answer D. Noise 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 - Answer B. Upward Common mode rejection is... A. The ability of an amplifier to cancel out ECG artifact B. The characteristics of an amplifier that rejects external interference C. is dependent on the sampling rate D. Controlled by the 60- cycle notch filter - Answer B. The characteristics 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... 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) 67% of the peak deflection D. for the deflection to fall (decay) to 67% of the peak deflection - Answer D. for the deflection to fall (decay) to 67% 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 A high frequency setting of 35 Hz would attenuate 50 Hz 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. LF 5.0 Hz and HF 70 Hz B. LF 5.0 Hz and HF 15 Hz ABRET Board Exam Questions With Complete Solutions. C. LF 0.1 Hz and HF 70 Hz D. LF 0.1 Hz and HF 15 Hz - Answer B. LF 5.0 Hz and HF 15 Hz During the recording of cerebral activity, the calibration input voltage is changed from 50 uV to 100 uV. 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 What input voltage is necessary to give a calibration deflection between 5 and 10mm if the sensitivity is 30uV/mm? a. 10uV b. 50uV c. 100uV d. 200uV - Answer D. 200 uV The term RAM means A. read only memory used for archiving data B. The amount of data that can be stored on a rewritable CD C. The amount of data that can be stored on a DVD D. Temporary memory storage that is critical to rapid computer operations - Answer D. Temporary memory storage that is critical to rapid computer operations Three basic computer ports are A. Intranet, Internet, and Extranet B. Internal, External, and Bifid C. Serial, Paradoxical, and US D. Serial, Parallel, and USB - Answer D. Serial, Parallel, and USB Which of the following is not related to measuring electrode resistance A. Opposition to direct current flow B. Measurement while the electrode is unattached to the scalp C. Measurement with an ohmmeter D. Opposition to alternating current flow - Answer D. Opposition to alternating current flow.