chemical engineering process control and instrumentation MCQs – Page 15

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 Review each marked answer and report any item that may be outdated or unclear.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
281. Configuration of Bourdon spring tube is never made of _____________ shape?
comments icon0
A. Circular

B. Semi-circular

C. Helical

D. Spiral

282. A system with transfer function [(2S/4S) + 1] is of _____________ order?
comments icon0

A. 2nd

B. 3rd

C. Zero

D. 1st
283. Thermal conductivity measurement com-prises the working principle of a_________________?
comments icon0
A. CO2 analyser

B. Spectrometer

C. Polarimeter

D. Chromatograph

284. Which of the following is not classified as a thermo electric pyrometer ?
comments icon0

A. Resistance thermometer

B. Optical pyrometer (disappearing filament type)

C. Thermocouple

D. Radiation pyrometer

285. Hot wire anemometer is used for the measurement of___________________?
comments icon0

A. Flow rates of granular solids

B. Thermal conductivity of gases

C. Very high temperature

D. Flow rates of fluids
286. Continuous measurement of specific gravity of a liquid is done by __________________?
comments icon0

A. Hydrometer

B. Contact-type electric indicators

C. Displacement meter

D. Both A. and C.
287. Bode stability method uses ____________ loop transfer function?
comments icon0

A. Neither A. nor B.

B. Open

C. Closed

D. Either A. or B.

288. An amplitude ratio of 0.1 corresponds to _____________ decibels?
comments icon0

A. -10

B. 20

C. 10

D. -20
289. _______________ thermometer cannot measure sub-zero (< 0 C) temperature ?
comments icon0

A. Mercury in glass

B. Resistance

C. Vapor pressure

D. Bimetallic
290. Radiation pyrometers as compared to thermocouples____________________?
comments icon0

A. Cant measure the temperature of moving objects

B. Is more affected by corrosive atmosphere

C. Has a slower speed of response

D. Can measure higher temperature
291. Continuous measurement of moisture content of paper in paper industry is done by measuring the_________________?
comments icon0
A. Electrical resistance through the paper

B. Magnetic susceptibility

C. Thermal conductivity through the paper

D. None of these

292. Which of the following measurements can be made by the measurement of emf ?
comments icon0
A. All A., B. & C.

B. Composition of complex ions

C. Degree of hydrolysis

D. pH value

293. A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same_________________?
comments icon0

A. Speed of response

B. Temperature measuring range (- 40C to 450C)

C. Accuracy ( 1% of span)

D. All a, b & c
294. Thermocouple in a thermal well behaves as a true ________________?
comments icon0

A. Second order system (overdamped)

B. Multiple first order system

C. Second order system (underdamped)

D. First order system

295. The unit step response of the transfer function 1/(s2 + 2s + 3) _______________________?
comments icon0

A. Has a non-zero slope at the origin

B. Is overdamped

C. Has a damped oscillatory characteristics

D. Is unstable

296. In a second order under damped system, the_________________?
comments icon0

A. h the decrease of damping co-efficient</strong>

B. None of these

C. Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of

D. Overshoot (which is a measure of how much the response exceeds the ultimate value) increase

E. rshoot

F. Time required for the response of first reach its ultimate value is called the response time

297. A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency. This is _______________ criterion?
comments icon0

A. Nyquist

B. None of these

C. Routh stability

D. Bode stability
298. The frequency at which maximum amplitude ratio is attained is called the ______________ frequency?
comments icon0

A. Natural

B. Corner

C. Cross-over

D. Resonant
299. The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60, then the dead time (in minutes) is________________?
comments icon0

A. ?/12

B. ?/3

C. ?/6

D. 5?/12
300. Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as________________?
comments icon0

A. Q(T0 T) = Ac . h (dT/dt)

B. Q0(T0 T) = Ac . h (dT/dt)

C. Q0T0 QT = Ac . h (dT/dt)

D. Q(T0 T) = Ac . (dTH/dt)