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Biomedical Instrumentation Mcqs

Q:

Recording electrical activities associated with heart is known as ____________

A) EEG B) EOG
C) EMG D) ECG
 
Answer & Explanation Answer: D) ECG

Explanation: The recording of the electrical activities associated with the functioning of the heart is known as electrocardiogram. ECG is a quasi-periodical, rhythmically repeating signals synchronized by the function of the heart, which acts as a generator of bioelectric events. This generated signals can be described by the means of a simple electric dipole.

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309
Q:

Electrooculography (EOG/E.O.G.) is a technique for measuring what?

A) abnormal function of the retina B) heart rate
C) respiration rate D) cornea-retinal standing potential
 
Answer & Explanation Answer: D) cornea-retinal standing potential

Explanation: Electrooculography (EOG / E.O.G) is a technique for measuring the potential of the corneal retinal standing potential that exists between the front and back of the human eye. The resulting signal is called electrooculogram. The main applications are in the diagnosis of ophthalmology and the recording of eye movements.

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282
Q:

The tympanic membrane separates the ear canal from the _____________

A) upper ear cavity B) lower ear cavity
C) middle ear cavity D) inner ear cavity
 
Answer & Explanation Answer: C) middle ear cavity

Explanation: The tympanic membrane separates the ear canal from the middle ear cavity. The pinna scatters acoustic waves so that some of the scattered energy enters the auditory canal and pushes against the tympanic membrane during a wave of compression. The distance membrane moves is a function of the force and velocity with which the air molecules strike it and is, therefore, related to the loudness of sound.

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263
Q:

Unwanted signal at the output due either to internal sources or to interference is called ________

A) offset B) noise
C) drift D) threshold
 
Answer & Explanation Answer: B) noise

Explanation: Noise is the unwanted signal at the output due either to internal sources or to interference. Offset is the output that will exist when it should be zero. The threshold of the transducer is the smallest change in measurant that will result in a measurable change in the transducer output.

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259
Q:

Phonocardiography is listening to __________

A) arm muscle sound B) lungs sound
C) heart sound D) respiratory tract sound
 
Answer & Explanation Answer: C) heart sound

Explanation: A phonocardiogram (or PCG) is a record high-constancy recording of sounds and mumble made by the heart with the assistance of the machine called phonocardiography. Consequently, phonocardiography is the chronicle of the considerable number of sounds made by the heart amid a heart cycle. Mostly stethoscope is used phonocardiography.

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254
Q:

Active transducers work on the principle of ________

A) energy conversion B) mass conversion
C) energy alteration D) volume conversion
 
Answer & Explanation Answer: A) energy conversion

Explanation: Active transducers work on the principle of energy conversion. They convert one form of energy to another. They don’t require any power to operate.

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248
Q:

Sound intensity is proportional to the _________ of sound pressure.

A) cube B) square
C) inverse square D) inverse square root
 
Answer & Explanation Answer: B) square

Explanation: Sound intensity is proportional to the square of sound pressure. Sound pressure, for a given sinusoidal event, is related linearly to both amplitude and frequency. Sound intensity may be defined as the amount of energy flow per unit time through a unit area perpendicular to the direction of energy flow.

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243
Q:

LVDT stands for _________

A) Linear Virtual Double Transformer B) Linear Virtual Differential Transducer
C) Linear Variable Differential Transducer D) Linear Variable Differential Transformer
 
Answer & Explanation Answer: D) Linear Variable Differential Transformer

Explanation: LVDT stands for Linear Variable Differential Transformer. These transducers are conventionally used for measurement of physiological pressure. They generally work in conjunction with carrier amplifiers.

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