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chemical engineering process control and instrumentation MCQs

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 Review each marked answer and report any item that may be outdated or unclear.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
1. On-off control which is a special case of proportional control, has a band width of about _____________ percent?
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A. 75

B. 0

C. 25

D. 100

2. The transfer function for an ideal proportional plus reset controller (reset time T) is_______________?
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A. Kc(1 + TS)

B. Kc/[1 + (s/T)]

C. Kc/(1 + TS)

D. Kc[1 + (1/TS)]
3. Which of the following thermocouples has the least temperature measurement range ?
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A. Copper-constantan

B. Chromel-alumel

C. Iron-constantan

D. Platinum-platinum/rhodium

4. The inverse Laplace transform of the function f(S) = 1/S (1 + S) is_________________?
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A. 1 e-t

B. 1 + et

C. 1 et

D. 1 + e-t

5. Identify an unbounded input from inputs whose transfer functions are given below______________?
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A. 1

B. 1/(S2 + 1)

C. 1/S2

D. 1/S

6. Thermistors are made of__________________?
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A. Nickel-chromium alloys

B. Iron-copper alloys

C. Ultra pure metals

D. Metal oxides
7. A system with a double pole at the origin is unstable since the corresponding term in the time domain________________?
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A. Grows linearly with time

B. Decays linearly with time

C. Is a constant

D. Grows exponentially with time

8. Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by__________________?
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A. All A , B & C.

B. Making the volume of thermometer bulb as large as conveniently possible

C. Reducing the volume of the receiving element to a minimum

D. Reducing the volume of the capillary to a minimum

9. A non-linear system will have _____________ steady state values?
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A. One

B. Two

C. Three

D. More than one
10. A barometer measures the _____________ pressure?
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A. Absolute

B. Gauge

C. Absolute as well as gauge

D. dynamic

11. Platinum resistance thermometer can be used upto antimony point which is ____________ C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure?
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A. 1261.93

B. 1064.43

C. 961.93

D. 630.74
12. Composition of alloys can be determined by _________________?
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A. Polarograph

B. Refractometer

C. None of these

D. Chromatograph

13. A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in_______________?
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A. Current

B. Voltage

C. Flux density

D. Light intensity
14. Normal mercury thermometer can be used to measure a temperature of about 300C. However, its maximum temperature measurement range can be increased upto about 500C by__________________?
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A. Filling nitrogen under pressure in the stem

B. Accounting for the tube expansion

C. Using steel tube in place of glass tube

D. Increasing the diameter of the tube

15. A sinusoidal variation in the input passing through a linear first order system _________________?
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A. Gets attenuated (magnitude decreases)

B. Becomes more oscillatory (frequency increases)

C. Gets amplified (magnitude increases)

D. Becomes less oscillatory (frequency decreases)

16. Working principle of mercury in glass thermometer is based on the ______________ of mercury with increase in temperature?
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A. Volumetric expansion

B. Increase of pressure

C. Differential linear expansion

D. Increase of thermal conductivity

17. A bolometer is __________________?
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A. Used for the measurement of thermal radiation

B. An element which senses optical input and delivers thermal output

C. Both A. & B.

D. Neither A. nor B.

18. Concentration of sugar solution can be determined by the__________________?
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A. Oscillometry

B. Flame photometry

C. Emission spectroscopy

D. Polarimetry
19. Mercury thermometer can be used to measure the temperature upto ____________ C?
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A. 350

B. 250

C. 100

D. 750

20. A pyranometer is an instrument used for measuring the___________________?
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A. Beam radiation

B. Bright sunshine period

C. None of these

D. Global radiation