chemical engineering process control and instrumentation MCQs – Page 7

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 Review each marked answer and report any item that may be outdated or unclear.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

121. Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 1600C ?
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A. Radiation pyrometer

B. Thermocouples

C. Optical pyrometer

D. Photoelectric pyrometer

122. Specific gravity of a liquid cannot be measured by a/an __________________?
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A. Pycnometer

B. Specific gravity bottle

C. Hydrometer

D. Anemometer

123. Composition of natural gas is determined by the_________________?
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A. Haldane apparatus

B. Mass spectrometer

C. Chromatograph

D. Both B. and C.

124. The term analogous to voltage in a single tank system is the_______________?
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A. Level of liquid

B. Heat content of the system

C. Flow rate

D. Liquid volume in the tank

125. Nichols chart deals with __________________?
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A. A.R. vs. phase lag of first order

B. Closed loop values vs. open loop values

C. Frequency response values of controllers

D. A.R. vs. phase lag of second order

126. Pick out the wrong statement ?
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A. Paramagnetic susceptibility of gases permits the measurement of their concentration

B. CO2 is the strongest paramagnetic gas

C. O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons

D. Paramagnetic susceptibility of gases decreases with temperature

127. Which is the strongest paramagnetic gas ?
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A. NO

B. NO2

C. CO2

D. O2

128. Volumetric expansion is the working principle of the ______________ thermometers?
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A. Vapor pressure

B. Constant volume gas

C. Bimetallic

D. Mercury in glass

129. Working principle of radiation pyrometer is based on the ________________?
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A. Wiens law

B. Kirchoffs law

C. Stefan-Boltzmann law

D. Seebeck effect

130. An aneroid barometer measures the _____________ pressure?
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A. Absolute

B. Vacuum

C. Gage

D. Atmospheric

131. Bimetal strips are not used in________________?
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A. Relays for opening & closing of electrical circuits

B. Thermostats

C. Bimetallic thermometers

D. Thermocouples

132. Thermal wells used in temperature measurements should have __________________?
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A. Polished surface

B. High transmissivity of radiation

C. Low emissivity

D. Very thick walls

133. The unit of time constant of a system is the same as that of___________________?
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A. (Time)-1

B. None of these

C. Time

D. Velocity

134. Which of the systems having the following transfer function is stable ?
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A. 1/(S2 + 2)

B. 1/(S2 + 2S + 2)

C. exp (-20 S)/(S2 + 2S 1)

D. 1/(S2 2S + 3)

135. Flapper nozzle is used in a/an ______________ controller?
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A. None of these

B. Electronic

C. Hydraulic

D. Pneumatic

136. Which of the following is not a second order instrument ?
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A. Mercury in glass thermometer with covering

B. Bare mercury in glass thermometer

C. None of these

D. Pressure gauge with one bellow, two tubes and a tank

137. Which of the following is not a differential pressure flow meter ?
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A. Orificemeter

B. Rotameter

C. Flow nozzle

D. Venturimeter

138. A pyrheliometer is an instrument used for measuring the_________________?
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A. None of these

B. Bright sunshine period

C. Diffuse radiation

D. Beam radiation

139. Stalagmometer is used for the measurement of__________________?
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A. Kinematic viscosity

B. Surface tension

C. Refractive index

D. Optical activity

140. Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion ?
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A. Brass

B. Nickel

C. Invar

D. Chromel

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