chemical engineering process control and instrumentation MCQs – Page 6

Practise multiple-choice questions from chemical engineering process control and instrumentation for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering process control and instrumentation Mcqs
101. Which of the following is not the triple point of water ?
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A. 273K

B. 32R

C. 32F

D. 492R

102. Positioning controllers are used for _______________?
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A. Low loads

B. Temperature changes

C. Flow rate changes

D. High loads
103. Which of the following judges the accuracy of an instrument ?
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A. Static error

B. Drift

C. Dead zone

D. None of these

104. The ____________ of a vapor pressure thermometer is a secondary element ?
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A. Pointer

B. None of these

C. Bulb

D. Bourdon tube
105. Mercury manometer (U-tube type) exemplifies a ______________ order system?
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A. Zero

B. Third

C. First

D. Second
106. Humidity of air can be determined by a__________________?
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A. Sling psychrometer

B. Chromatograph

C. Polarimeter

D. Mass spectrometer

107. Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a________________?
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A. Dilatometer

B. Mercury thermometer

C. Beckman thermometer

D. Bimetallic thermometer

108. The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly__________________?
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A. Non-linear

B. Linear

C. Parabolic

D. Hyperbolic

109. Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an ?
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A. Liquid semi-conductor

B. Solid semi-conductor

C. Conductor

D. Insulator

110. The thermal emf-temperature relationship of most thermocouples is_________________?
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A. Parabolic

B. Linear

C. Exponential

D. Square root

111. Mcleod gauge measures the _____________ pressure?
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A. Very high

B. Positive

C. Sub-atmospheric

D. Atmospheric

112. Non-metallic diaphragm used as pressure sensor in instruments is generally made of__________________?
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A. Bakelite

B. Synthetic rubber

C. Teflon

D. Thick paper

113. Process degree of freedom indicates _______________ number of controllers to be used?
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A. The maximum

B. The minimum

C. Both maximum and the minimum

D. Nothing about the

114. Emf developed by a thermocouple, while measuring a temperature of 600C is about 5.5 mV. The type of thermocouple used is_______________?
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A. Chromel-alumel

B. Iron-constantan

C. Platinum-platinum + rhodium

D. Either A., B. or C.

115. Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change ?
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A. Methyl alcohol

B. Carbon-tetrachloride

C. Water

D. Mercury
116. Flame photometry is used for the determination of compositional analysis of_______________?
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A. Solids

B. Isotopes

C. Alkali metals

D. Natural gas

117. Which of the following is not a composition measuring instrument ?
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A. Thermal conductivity cell

B. Hot wire anemometer

C. Polarograph

D. Mass spectrometer

118. Liquid argon level in a pressurised storage tank (at 3 kg/cm2) is measured by a/an ____________________?
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A. External float gage

B. Differential pressure gage

C. None of these

D. Gage glass

119. Starting temperature of optical radiation pyrometer is ______________ C?
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A. 1500

B. 400

C. 1200

D. 800
120. Stroboscope is used for the measurement of _________________?
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A. Liquid level under pressure

B. Frequency of light

C. Depression of freezing point

D. Rpm of a flywheel