chemical engineering process control and instrumentation MCQs – Page 14

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 Review each marked answer and report any item that may be outdated or unclear.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

261. Which of the following controllers has the least maximum deviation ?
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A. P-controller

B. P-D controller

C. P-I controller

D. P-I-D controller

262. The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system_________________?
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A. Depends only upon the open loop transfer function

B. Is the same for set point or load changes

C. All A , B & C.

D. Determines its stability

263. The level of a liquid under pressure can be determined using___________________?
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A. Differential pressure manometer

B. Diaphragm box system

C. Bubbler system

D. Air-trap system

264. Characteristic equation is the denominator of ____________ loop transfer function?
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A. Open

B. Closed

C. Both A. and B.

D. Neither A. nor B.

265. Which of the systems having following transfer functions is stable ?
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A. 1/(s2 + 2s + 2)

B. exp (-20s)/(s2 + 2s 1)

C. 1/(s2 + 2)

D. 1/(s2 2s + 3)

266. A first order system with unity gain and time constant ? is subjected to a sinusoidal input of frequency w = 1/?. The amplitude ratio for this system is______________?
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A. 1/?2

B. 1

C. 0.25

D. 0.5

267. Liquid flow rate in a small channel is best measured by a/an____________________?
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A. Venturimeter

B. Weir

C. Vane meter

D. Pitot tube

268. Sub-zero temperature (< 0C) can be measured by a constant volume gas thermometer employing ?
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A. Nitrogen

B. Helium

C. Hydrogen

D. None of these

269. Dilute wine was used as a thermometric liquid initially to develop temperature scale. First empirical temperature scale developed was the _____________ scale?
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A. Kelvin

B. Fahrenheit

C. Reaumer

D. Centigrade

270. Turbine flow meters are suitable for_________________?
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A. Very limited flow ranges

B. Cryogenic flow measurements

C. Aerospace and in air borne applications

D. Both B. and C.

271. Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant) ?
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A. P/nRT

B. nRT/P

C. nRT/V

D. V/nRT

272. Compositional analysis of ______________ is done using mass spectrometer?
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A. An isotope

B. Natural gas

C. An alloy

D. A solid

273. Silver point temperature is ______________ C?
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A. 860.5

B. 760.5

C. 1060.5

D. 960.5

274. The amplitude ratio for the sinusoidal response of __________ is < 1?
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A. First order system

B. Second order system

C. None of these

D. Transportation lag

275. With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer ?
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A. Remain constant

B. Increases

C. Increases exponentially

D. Decreases

276. Time constant is the __________________?
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A. Same as transportation lag

B. Time required by the measured variable to reach 63.2% of its ultimate change

C. Same as dead time

D. Time taken by the controlled variable to reach 63.2% of its full change

277. What is the Laplace transform of sin t ?
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A. s/(s2 1)

B. s/(1 + s2)

C. 1/(s2 1)

D. 1/(s2 + 1)

278. The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ C?
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A. 250

B. 500

C. 750

279. Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a __________________?
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A. Vapor pressure thermometer

B. Thermocouple

C. Resistance thermometer

D. Mercury in glass thermometer

280. Flow rate of a river is measured by a/an____________________?
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A. Pitot tube

B. Open weir

C. Kennison nozzle

D. Vane meter

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