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In the sampling control, one complete rotation of the plate thus presents _______

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In the sampling control, one complete rotation of the plate thus presents _______

(a) 35 samples

(b) 40 samples

(c) 20 samples

(d) 30 samples

The question was asked during an interview.

My query is from Medical Diagnosis with Chemical Tests topic in chapter Clinical Laboratory Instruments of Biomedical Instrumentation

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Best answer
Right answer is (b) 40 samples

The explanation: The plate rotates a distance sufficient to allow the tube, when it next moves down, to dip into the next cup. One complete rotation of the plate thus presents 40 samples. As the sample plate completes a cycle, a switch is operated, which stops the rotating action of the plate and the sampling action of the sample probe. The sampling rate can be adjusted to 20, 40 or 60 per hour.

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