Multiple choice questions. Choose the correct answer for each of the following q
ID: 2085063 • Letter: M
Question
Multiple choice questions. Choose the correct answer for each of the following questions
according to course materials. Please provide explanations to your answers. (five part question)
1. The RF interference in a hospital comes from a/an:
a) 60 Hz noise to the patient’s ECG signal.
b) Activation of the false alarm circuit of the hospital security system.
c) A disruption in the operation of a pacemaker.
d) DC offset from the patient’s EMG signal.
e) None of (a) through (d) is correct answer.
2. Convolution in a DSP chip means::
a) Adding two input signals together to form the third one.
b) Combining a signal twice.
c) Detecting similarity between two signals.
d) Cross-correlation of two signals with both signals flipped.
e) None of (a) through (d) is correct answer.
3. A better resolution is detected when the ultrasound transducer is placed:
_________
a) At an angle over the muscle.
b) Directly over the muscle
c) Over the bone-muscle interface
d) The location does not matter as long as the transducer touches the muscle.
e) None of (a) through (d) is correct answer
4. Which of the following statements is not true in ultrasound transmission?
a) Ultrasound is a sound wave greater than 20 kHz..
b) Ultrasound cannot travel in a vacuum.
c) Ultrasound travels with the same speed in tissues, muscles, and bones.
d) Ultrasound energy decreases as it travels through the body.
e) None of (a) through (d) is correct answer
5. Gel is used to provide an air-free contact for an ultrasound transducer because:
a) It keeps the transducer warm.
b) Air reflects ultrasound back to the transducer.
c) Air absorbs ultrasound..
d) Moving it over the skin is easier..
e) None of (a) through (d) is correct answer
Explanation / Answer
1 sol :
Option C is the correct answer because these give RFI when the phone was near by 15 inches or closer.
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