CNIM - Instrumentation Exam Questions with Verified Answers Latest Version 2025 Already Passed
A unit of resistance is symbolized by... - Answers Ohms
Fast Fourier transformation - Answers The mathematical transformation f a complex waveform into
simpler, more uniform waves
The capacity to resolve amplitudes of 256 discrete steps would require an 8 bit A to D converter. This
can be represented by... - Answers 2^8
What is the minimum required bandpass for an EP system? - Answers 0.1 - 5,000 Hz
The gain of an amplifier, set to give an output signal of 1 volt for an input signal of 10 uV, is... - Answers
Gain=output/input
Gain=1,000,000 uV/10 uV
Gain=100,000
A 100 mS epoch is recorded with a 10 ms post-stimulus triggering. What best describes the resulting
sweep? - Answers A 100 ms sweep starting 10 ms after the stimulus.
SSEP recordings typically require a bandpass of... - Answers 30 Hz to 3000 Hz
To accurately represent the amplitude of an EP waveform, a match must be made between the... -
Answers Signal size and the vertical capacity of the digitizer
In selecting the horizontal parameters of analysis, the... - Answers Sampling rate should be at least two
times greater than the highest frequency of in the signal.
The assumption that reponses of excessive amplitude are likely to contain artifact forms the basis for... -
Answers Artifact rejection
In a differential amplifier used for IONM, the common mode rejection of in phase signals is typically... -
Answers 10000 to 1
A differential amplifier records... - Answers The difference between the two inputs.
An erroneous representation of an analog wave by A to D conversion suggesting a lower frequency due
to a low sampling rate is called... - Answers Aliasing
What are good insulating materials? - Answers Glass and Rubber
Electrode impedance is defined as opposition to... - Answers Alternating current flow
Dwell time can be defined as... - Answers The intersample interval
If not specified, most reports on ABR are displayed... - Answers Vertex positive up
, The horizontal resolution of an evoked potential system... - Answers Should be 20 ms per data point or
less
The difference between the voltages in input 1 and input 2 will make the display of the amplifier... -
Answers Either up or down
In theory, amplitude of the EPs relative to the background noise... - Answers Will improve by a factor
approximately equal to the square root of the number of epochs averaged.
Nyquist frequency... - Answers Minimum sampling rate to prevent aliasing
Cathode - Answers Negative pole or block dot on the bar electrode
Aliasing is the result of... - Answers Sampling below the Nyquist frequency
Changing the low cut BAEP from 100 to 200 Hz will result in... - Answers Decreased response latency
If the cutoff frequency of a filter is 100 Hz, then a 100 Hz signal will be reduced in amplitude by... -
Answers 30%
If the highest frequency component of an EP is 400 Hz, then the minimum sampling rate required to
accurately represent the signal is... - Answers 800 Hz
Vertical resolution depends on... - Answers Number of bits
If a 10 uV signal inside 50 uV of noise is averaged for 100 traces. The final signal to noise ration will be... -
Answers SNR = signal/noise
SNR WAS: 1:5
Square root of 100 = 10, so S/N = 10:5 or 2:1
An EP recording system should allow averaging of... - Answers At least 4000 trials
The input impedance of a differential amplifier must be at least... - Answers 100 megaohms
When using constant voltage for racial nerve stim and the nerve becomes bathed in CSF, what will occur
after the area is suctioned... - Answers The current flow will very in order to maintain the preset voltage
level
Reduction of the high frequency filter... - Answers Increases EP latency
The sensitivity setting on an amplifier set to produce a vertical deflection of 1 cm with an input of 10 mV
is... - Answers I cm = 10 mm
1 mV/mm
Prestimulus Triggering... - Answers Includes a period of recording before the stimulus
A unit of resistance is symbolized by... - Answers Ohms
Fast Fourier transformation - Answers The mathematical transformation f a complex waveform into
simpler, more uniform waves
The capacity to resolve amplitudes of 256 discrete steps would require an 8 bit A to D converter. This
can be represented by... - Answers 2^8
What is the minimum required bandpass for an EP system? - Answers 0.1 - 5,000 Hz
The gain of an amplifier, set to give an output signal of 1 volt for an input signal of 10 uV, is... - Answers
Gain=output/input
Gain=1,000,000 uV/10 uV
Gain=100,000
A 100 mS epoch is recorded with a 10 ms post-stimulus triggering. What best describes the resulting
sweep? - Answers A 100 ms sweep starting 10 ms after the stimulus.
SSEP recordings typically require a bandpass of... - Answers 30 Hz to 3000 Hz
To accurately represent the amplitude of an EP waveform, a match must be made between the... -
Answers Signal size and the vertical capacity of the digitizer
In selecting the horizontal parameters of analysis, the... - Answers Sampling rate should be at least two
times greater than the highest frequency of in the signal.
The assumption that reponses of excessive amplitude are likely to contain artifact forms the basis for... -
Answers Artifact rejection
In a differential amplifier used for IONM, the common mode rejection of in phase signals is typically... -
Answers 10000 to 1
A differential amplifier records... - Answers The difference between the two inputs.
An erroneous representation of an analog wave by A to D conversion suggesting a lower frequency due
to a low sampling rate is called... - Answers Aliasing
What are good insulating materials? - Answers Glass and Rubber
Electrode impedance is defined as opposition to... - Answers Alternating current flow
Dwell time can be defined as... - Answers The intersample interval
If not specified, most reports on ABR are displayed... - Answers Vertex positive up
, The horizontal resolution of an evoked potential system... - Answers Should be 20 ms per data point or
less
The difference between the voltages in input 1 and input 2 will make the display of the amplifier... -
Answers Either up or down
In theory, amplitude of the EPs relative to the background noise... - Answers Will improve by a factor
approximately equal to the square root of the number of epochs averaged.
Nyquist frequency... - Answers Minimum sampling rate to prevent aliasing
Cathode - Answers Negative pole or block dot on the bar electrode
Aliasing is the result of... - Answers Sampling below the Nyquist frequency
Changing the low cut BAEP from 100 to 200 Hz will result in... - Answers Decreased response latency
If the cutoff frequency of a filter is 100 Hz, then a 100 Hz signal will be reduced in amplitude by... -
Answers 30%
If the highest frequency component of an EP is 400 Hz, then the minimum sampling rate required to
accurately represent the signal is... - Answers 800 Hz
Vertical resolution depends on... - Answers Number of bits
If a 10 uV signal inside 50 uV of noise is averaged for 100 traces. The final signal to noise ration will be... -
Answers SNR = signal/noise
SNR WAS: 1:5
Square root of 100 = 10, so S/N = 10:5 or 2:1
An EP recording system should allow averaging of... - Answers At least 4000 trials
The input impedance of a differential amplifier must be at least... - Answers 100 megaohms
When using constant voltage for racial nerve stim and the nerve becomes bathed in CSF, what will occur
after the area is suctioned... - Answers The current flow will very in order to maintain the preset voltage
level
Reduction of the high frequency filter... - Answers Increases EP latency
The sensitivity setting on an amplifier set to produce a vertical deflection of 1 cm with an input of 10 mV
is... - Answers I cm = 10 mm
1 mV/mm
Prestimulus Triggering... - Answers Includes a period of recording before the stimulus
