Biomedical Instrumentation Mcqs


________ is not part of the manifold.

A) Transmission tubing B) Pump tubes
C) Platter D) Plastic tubes
Answer & Explanation Answer: D) Plastic tubes

Explanation: A manifold mainly consists of a platter, pump tubes, coils, transmission tubing, fittings and connections. A separate manifold is required for each determination and the change can be effected within a few minutes. The pump tubing and the connected coils are placed on a manifold platter, which keeps them in proper order for each test.

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In the proportioning pump, two speed pump has a non-synchronous _____ rpm motor.

A) 10 rpm B) 30 rpm
C) 45 rpm D) 15 rpm
Answer & Explanation Answer: C) 45 rpm

Explanation: Proportioning pumps are available either for single-speed or for two-speed operations. The single-speed pump has the capacitor synchronous gear head utilizing 10 rpm output shaft at 50 Hz. The two-speed pump has a non-synchronous 45 rpm motor.

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The function of the _________ is to continuously and simultaneously push fluids, air and gases through the analytical chain.

A) sampling unit B) proportioning pump
C) manifold D) dialyzer
Answer & Explanation Answer: B) proportioning pump

Explanation: The function of the proportioning pump is to continuously and simultaneously push fluids, air and gases through the analytical chain. In fact, it is the heart of the automatic analysis system.

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Which cams are used in the earlier modules of auto-analyzers to initiate and control sample aspiration and wash cycles?

A) Electrical cams B) Digital cams
C) Analog cams D) Mechanical cams
Answer & Explanation Answer: D) Mechanical cams

Explanation: Mechanical cams were used in the earlier modules of auto-analyzers to initiate and control sample aspiration and wash cycles. Modern systems use electronic timers to do the same function. These timers provide greater flexibility in the control of the sample-to-wash ratios, which in turn allows flexibility in setting up parameters for analyses.

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In the sampler, the range of the sample size is from _______

A) 0.1 to 8.5 ml B) 1 to 8.5 ml
C) 0.85 to 0.1 ml D) 8.5 to 10 ml
Answer & Explanation Answer: A) 0.1 to 8.5 ml

Explanation: With this sampler, the sample size may range from 0.1 to 8.5 ml. It utilizes cups of sizes 0.5, 2, 3 and 10 ml. The sample plate is kept covered to prevent evaporation, which may sometimes lead to errors up to 5%. Sampling and washing periods are controlled by a programming cam.

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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
Answer & Explanation Answer: B) 40 samples

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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The blood pressure within the glumerular capillaries is _________ of mercury.

A) 80 mm B) 70-80 mm
C) 90 mm D) 70-90 mm
Answer & Explanation Answer: D) 70-90 mm

Explanation: The renal arteries carry blood at very high pressure from the aorta into the glomerular capillary tuft. The blood pressure within the glomerular capillaries is 70–90 mm of mercury. The blood flow through the capillary tuft is controlled by the state of contraction of the muscle of the arteriole leading to the tuft.

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Which of the following is not the electrolyte?

A) Bicarbonate B) Potassium
C) Magnesium D) Sodium
Answer & Explanation Answer: C) Magnesium

Explanation: For instance, the group of important anions and cations of the blood plasma (electrolytes) like sodium, potassium, chloride and bicarbonate, which together with serum urea form a related set of tests— performed on patients with electrolyte disturbances.

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