Instrumentation Multiple Choice Questions Answers

81. The function of the reference electrode in a pH meter is to provide

(a) a constant current.
(b) a constant voltage.
(c) temperature compensation.
(d) both (b) and (c).

82. The disadvantage(s) of capacitor microphones is/are

(a) higher cost.
(b) high voltage supply requirement.
(c) limited frequency range.
(d) both (a) and (b).

83. The devices extensively used in sound measurement systems are

(a) capacitor microphones.
(b) carbon microphones.
(c) dynamic microphones.
(d) vibration pickups.

84. Geiger counter has the advantages of

(a) being relatively inexpensive, reliable and rugged in construction.
(b) producing easily countable large pulses.
(c) having response independent of variations in humidity, temperature and atmospheric pressure.
(d) all of the above.

85. The activity of a radioactive sample goes down to 12.5 % in a time of x days. The half life of this sample is nearly

(a) 12x
(b) 8x
(c) x/3
(d) 3x

86. Scintillation counters have the advantage(s) of

(a) very fast counting rate.
(b) capability of detecting of radiations of lower levels.
(c) capability of detecting of x-rays.
(d) all of the above.

87. Environmental pollution is not caused by

(a) atmospheric air and water pollution.
(b) high humidity content in atmospheric air.
(c) noise pollution.
(d) radioactive fallout.

88. Data acquisition systems are usually of

(a) analog type.
(b) digital type.
(c) integrating type.
(d) hybrid type.

89. Which one of the following definitions correctly represents a data acquisition system (DAS) ?

(a) DAS is a group of electronic devices that are connected to perform the measurement and quantization of electrical signals for digital processing.
(b) DAS is a group of devices that are connected to store different signals.
(c) DAS is a system to control a process.
(d) DAS is a signal conditioner.

90. Consider the following statements

1. Low-pass filter. 2. Signal transmission medium. 3. Amplifier.
2. Digital-to-analog converter. 5. Analog-to-digital converter.

Which one of the following sequences is the correct sequence for effective signal reconstruction in a data acquisition and processing scheme ?
(a) 1-3-5-2-4.
(c) 1-5-3-2-4.
(b) 3-1-5-2-4.
(d) 3-5-1-4-2.

91. Which of the following are data representation elements in a generalized measurement system ?

1. Analog indicator. 2. Amplifier. 3. A/D converter. 4. Digital display.

Select the correct answer using the codes given below:
(a) 1 and 2.
(b) 1 and 4.
(c) 2 and 4.
(d) 3 and 4.

92. In an analog Data Acquisition System (DAS), what is the correct sequence of the blocks (therein) starting from the input ?

(a) Transducer – recorder – filter – signal conditioner.
(b) Transducer – signal conditioner – recorder.
(c) Signal conditioner – transducer – recorder.
(d) Signal conditioner – filter – transducer – recorder.

93. Digital data acquisition systems are used

1. only when the output of the transducers is in digital form.
2. when physical process being monitored is slowly varying (narrow bandwidth).
3. when low accuracy can be tolerated.
4. when high accuracy and low per channel cost is required.

Which of these statements are correct?
(a) 1, 2 and 3.
(b) 1, 3 and 4.
(c) 1 and 3.
(d) 2 and 4.

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