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In which type of electromagnetic blood flowmeter, the energizing voltage is given to magnet is a square wave?

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In which type of electromagnetic blood flowmeter, the energizing voltage is given to magnet is a square wave?

(a) Sine wave electromagnetic flowmeter

(b) Square wave electromagnetic flowmeter

(c) Sawtooth wave electromagnetic flowmeter

(d) Impulse wave electromagnetic flowmeter

The question was asked during an internship interview.

Question is from Cyber Medicine in section Telemedicine Technology of Biomedical Instrumentation

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The correct answer is (b) Square wave electromagnetic flowmeter

Easy explanation: This differs from a sine wave flowmeter in that the energizing voltage given to the magnet is a square wave and therefore, the induced voltage is also a square wave. The square wave flowmeter has less stringent requirements of phase stability than the sine wave type as it can suppress the quadrature voltages relatively easily.

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