chemical engineering process control and instrumentation MCQs – Page 2

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 Review each marked answer and report any item that may be outdated or unclear.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

21. Bode diagram are generated from output response of the system subjected to which of the following input ?
0

A. Step

B. Sinusoidal

C. Impulse

D. Ramp

22. In a single tank system, the transfer function of _____________ to inlet flow rate is 1/(TS+1)?
0

A. Outlet flow rate

B. Level

C. Both A. & B.

D. Neither A. nor B.

23. A constant volume gas thermometer employing ______________ is used to measure sub-zero (i.e., < 0C) temperature?
0

A. Hydrogen

B. None of these

C. Helium

D. Nitrogen

24. Nitrogen gas constant volume thermometer is suitable for measuring a temperature of _____________ C?
0

A. 0-100

B. > 50

C. < 0

D. > 100

25. Gas chromatography is used for the measurement of ________________?
0

A. Pressure

B. Concentration

C. Temperature

D. Flow rate

26. Stabilising time for the controllers is the time required for the response to reach _____________ percent of its ultimate value?
0

A. 95

B. 63.2

C. 87.5

D. 100

27. Working principle of disappearing filament type optical pyrometer is based on the ________________?
0

A. Peltier effect

B. Kirchoffs law

C. Seebeck effect

D. Wiens law

28. Which of the following does not figure in the list of seven substances selected for international temperature scale ?
0

A. Antimony and silver (F.P)

B. Oxygen and sulphur (B.P)

C. Ice (F.P) and steam (B.P)

D. Zinc (B.P) and mercury (F.P)

29. Very low pressure is expressed in microns (?), which is equal to ____________ mm of Hg column (absolute) at 0C?
0

A. 0.01

B. 0.1

C. 0.001

D. 0.0001

30. The frequency response of a first order system, has a phase shift with lower and upper bounds given by________________?
0

A. -?/2, ?/2

B. ?, ?/2

C. 0, ?/2

D. -?/2, 0

31. The transfer function of a first order system is______________?
0

A. 1/Ts

B. s/(Ts + 1)

C. None of these

D. 1/(Ts + 1)

32. In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is_____________?
0

A. H/G

B. G/(1 + H)

C. H/(1 + G)

D. G/H

33. Mcleod gauge is used to measure the __________________?
0

A. Point velocity

B. Pressure

C. Vacuum

D. Flow rate

34. Measurement of pressure in ammonia reactor is done by __________________?
0

A. Pirani gauge

B. U-tube manometer

C. Bourdon gauge

D. Inclined tube manometer

35. The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since______________?
0

A. The Laplace transform of integral of exp(at) has finite values only for s > a

B. The function exp(at) is piece-wise continuous only for s > a

C. The Laplace transform integral of exp(at) has initial values only for s > a

D. The function is exponential

36. What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1.H2 ?
0

A. H/(1 + GH)

B. G/(1 GH)

C. G/(1 + GH)

D. 1/(1 + GH)

37. Dilatometer is used to measure __________________?
0

A. Deflection

B. Contraction/expansion due to changes in temperature

C. Stress

D. Strain

38. The time constant of a first order process with resistance R and capacitance C is__________________?
0

A. RC

B. R + C

C. R C

D. 1/RC

39. Change of angle of refraction with composition comprises the working principle of a___________________?
0

A. Spectrometer

B. Polarimeter

C. Refractometer

D. Polarograph

40. Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1) ?
0

A. w = 1/?14, Kc = 45/7 ?14

B. w = ?(7/6), Kc = 46/3

C. w = ?(7/8), Kc = 45/4

D. w = 1, Kc = 13

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