chemical engineering process control and instrumentation MCQs – Page 10

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 Review each marked answer and report any item that may be outdated or unclear.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
181. ______________ is undesirable in thermocouples used in industries ?
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A. Oxidation resistance

B. Linear relation of emf to temperature

C. Non-linear relation of emf to temperature

D. Corrosion resistance

182. Liquid discharge from a tank or reservoir cannot be measured by __________________?
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A. Orificemeter

B. Mouthpieces

C. Weirs

D. Notches

183. Which thermocouple can be used to measure a temperature of around 1400C ?
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A. Copper-constantan

B. Aluminium-Chromel

C. Platinum-platinum + rhodium

D. None of these

184. Emission spectroscopy is used for__________________?
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A. Solids and metal analysis

B. Determining water purity

C. Determination of CO2 in gases

D. NOx determination

185. In Bode plot, ? vs. ? is plotted on a/an ______________ graph paper?
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A. Triangular

B. Semi-log

C. Ordinary

D. log-log
186. Phase lag of the frequency response of a second order system to a sinusoidal forcing function______________?
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A. Approaches 180 asymptotically

B. Is 120

C. Is 30

D. Is 90 at the most

187. Reset rate is the another term used for ____________ time?
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A. Derivative

B. None of these

C. Dead

D. Integral
188. Flow rate of sludge is not measured by a/an_________________?
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A. Orificemeter

B. Open weir

C. Kennison nozzle

D. Both B. & C.
189. pH meter has ____________________?
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A. Three cells

B. Two cells

C. One cell

D. No cell

190. Which of the following thermocouples is capable of measuring a temperature of -50C ?
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A. Copper-constantan

B. Platinum-platinum + rhodium

C. Chromel-Alumel

D. Iron-constantan

191. Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit ?
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A. Thomson effect

B. Peltier effect

C. Seebeck effect

D. Joule heating effect

192. ____________ stability method uses open loop transfer function?
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A. Mikhailov

B. Ruth

C. Nyquist

D. None of these

193. The calibration data of a thermocouple with its cold junction at 0C are given below. The hot junction of the thermocouple is placed in a bath at 80C, while its cold junction is at 20C. What is the emf of thermocouple ?
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A. 2.46 mv

B. 3.26 mv

C. 0.80 mv

D. 2.43 mv

194. A manometer measures the _____________ pressure?
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A. Absolute

B. Atmospheric

C. None of these

D. Gauge
195. For measuring the temperature of a red hot furnace, which is the most suitable instrument ?
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A. Thermocouple

B. Optical pyrometer

C. Bimetallic thermometer

D. Platinum resistance thermometer

196. Bourdon gauges are used for measuring pressure (kg/cm2) ?
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A. < atmospheric

B. > 2 (gauge)

C. 10 (absolute)

197. Mercury thermometer is commonly used for low temperature measurement. The freezing point and boiling point of mercury are respectively _____________ C?
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A. 39 and 350

B. 79 and 395

C. 10 and 425

D. 51 and 439

198. Out of the following thermocouple wire insulating material, the highest temperature rating is for________________?
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A. Teflon

B. Fibre glass

C. Asbestos

D. Ceramic fibre
199. Zirconia probe is used for the measurement of___________________?
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A. Humidity of air

B. % O2 in flue gas

C. Speed of a submarine

D. % CO2 in flue gas

200. ______________ controller has the maximum stabilising time?
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A. PI

B. P

C. PD

D. PID