chemical engineering process control and instrumentation MCQs – Page 5

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 Review each marked answer and report any item that may be outdated or unclear.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

81. Which is the most suitable instrument for measuring pressure below 3 microns ?
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A. Mcleod gauge

B. Alphatron

C. Bourdon gauge

D. Ionisation gauge

82. Which of the following thermocouples can measure the maximum temperature ?
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A. Chromel-alumel

B. Platinum-rhodium

C. Tungsten-molybdenum

D. Iron-constantan

83. Polarisation of light forms the working principle of a______________?
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A. Polarimeter

B. Spectrometer

C. Chromatograph

D. Polarograph

84. Which of the following filled system expansion thermometer has the capability to measure the lowest temperature ?
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A. Mercury in steel thermometer

B. Mercury in glass thermometer

C. Alcohol in glass thermometer

D. Fused metal (Na or K) in steel thermometer

85. In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the _____________ variable?
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A. None of these

B. Manipulated

C. Controlled

D. Load

86. Transfer function of transportation lag is___________________?
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A. None of these

B. 1/(Ts + 1)

C. eTS

D. e-TS

87. Degree to which an instrument indicates the changes in measured variable without dynamic error is called its ___________________?
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A. Reproducibility

B. Static characteristics

C. Fidelity

D. Speed of response

88. Mass spectrometer is used for the composition analysis of____________________?
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A. None of these

B. Solids

C. Isotopes

D. Alloys

89. Flow rate through an orifice is _____________ the pressure differential?
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A. Proportional to the square root of

B. Proportional to

C. Inversely proportional to the square root of

D. Inversely proportional to the square of

90. For two non-interacting first order systems connected in series, the overall transfer function is the ______________ of the individual transfer functions?
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A. Difference

B. Ratio

C. Sum

D. Product

91. Thermal well made of _____________ gives the fastest speed of response, while measuring temperature by thermocouples?
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A. Steel

B. Vycor (a glass)

C. Nichrome

D. Inconel

92. Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is __________________?
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A. Ethylene glycol

B. Water

C. Paraffin

D. Carbon tetrachloride

93. ____________ are analysed using a Polarograph?
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A. Solids

B. Gases

C. Liquids

D. Isotonic solutions

94. Which of the following is a contact pyrometer ?
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A. Optical pyrometer

B. Infra red pyrometer

C. Resistance pyrometer

D. Radiation pyrometer

95. Which of the following thermometers is not suitable for distant reading upto 60 metres ?
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A. Mercury in glass thermometer

B. Constant volume gas thermometer

C. Vapor pressure thermometer

D. Resistance thermometer

96. The amplitude ratio for the sinusoidal response of a _____________ is 1?
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A. Second order system

B. None of these

C. First order system

D. Transportation lag

97. Which of the following is not a mechanical pressure sensing element ?
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A. Bourdon tube

B. Bellows

C. Diaphragm

D. U-tube

98. Which of the following flow-metering instruments is an areameter ?
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A. Venturimeter

B. Rotameter

C. Hot wire anemometer

D. Pitot tube

99. An ideal PID controller has the transfer function [1 + (1/0.55) + 0.25]. The frequency at which the magnitude ratio of the controller is 1, is________________?
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A. 0.2/0.5

B. 0.5/0.2

C. 0.2 0.5

D. 1/?(0.2 0.5)

100. Pick out the most suitable instrument for measuring temperature in the range of-40 to 425C ?
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A. Mercury thermometer

B. Bimetallic thermometer

C. None of these

D. Radiation pyrometer

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